Add screen ratio fixing

LICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

README.md

@@ -1,7 +1,6 @@
 # a3270
 
 [![Build & Test](https://git.hugfreevikings.wtf/rudi/a3270/actions/workflows/build.yaml/badge.svg)](https://git.hugfreevikings.wtf/rudi/a3270/actions)
-[![Latest Release](https://git.hugfreevikings.wtf/rudi/a3270/badges/release.svg)](https://git.hugfreevikings.wtf/rudi/a3270/releases)
 [![Android](https://img.shields.io/badge/Android-API%2024%2B%20%7C%20Compose-green.svg)](https://developer.android.com)
 [![License](https://img.shields.io/badge/License-MIT%20%2F%20BSD-green.svg)](LICENSE)
 
@@ -110,3 +109,6 @@ I have contributed no code to this project, it was entirely written by LLMs with
  - Claude Opus 4.6
  - Gemini 3.1 Pro
  - Gemini 3.7 Flash
+ - Gemma4 12B and 26B
+ - GPT-OSS 120B
+ - Qwen3 4B and 32B

build.gradle

@@ -11,8 +11,8 @@ android {
         applicationId "org.pubvm.a3270"
         minSdk 24
         targetSdk 34
-        versionCode 3
-        versionName "0.1.2"
+        versionCode 4
+        versionName "0.1.3"
     }
 
     buildTypes {
@@ -42,6 +42,13 @@ android {
 if (findProject(':lib3270j') != null) {
     project(':lib3270j') {
         apply plugin: 'java-library'
+        dependencies {
+            testImplementation 'org.junit.jupiter:junit-jupiter:5.10.2'
+            testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+        }
+        test {
+            useJUnitPlatform()
+        }
         java {
             sourceCompatibility = JavaVersion.VERSION_11
             targetCompatibility = JavaVersion.VERSION_11
@@ -62,4 +69,7 @@ dependencies {
     implementation 'androidx.compose.ui:ui-tooling-preview'
     implementation 'androidx.compose.material3:material3'
     implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0'
+
+    testImplementation 'junit:junit:4.13.2'
+    testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
 }

src/main/java/org/pubvm/a3270/MainActivity.kt

@@ -21,7 +21,9 @@ import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.view.WindowCompat
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
-import org.lib3270j.protocol.DS3270Constants.AID_ENTER
+import android.content.Context
+import android.view.KeyCharacterMap
+import org.lib3270j.protocol.DS3270Constants.*
 import org.pubvm.a3270.service.TerminalService
 import org.pubvm.a3270.storage.HostStorage
 import org.pubvm.a3270.ui.ConnectDialog
@@ -32,8 +34,39 @@ import org.pubvm.a3270.ui.TerminalInputView
 import org.pubvm.a3270.ui.TerminalView
 import org.pubvm.a3270.ui.TwoRowKeyBar
 
+import org.pubvm.a3270.ui.UntrustedCertificateDialog
+
 class MainActivity : ComponentActivity() {
 
+    companion object {
+        init {
+            val rootLogger = java.util.logging.Logger.getLogger("")
+            rootLogger.level = java.util.logging.Level.ALL
+            for (h in rootLogger.handlers) {
+                rootLogger.removeHandler(h)
+            }
+            rootLogger.addHandler(object : java.util.logging.Handler() {
+                override fun publish(record: java.util.logging.LogRecord?) {
+                    if (record == null) return
+                    val msg = record.message ?: ""
+                    val tag = "a3270-" + (record.loggerName?.substringAfterLast('.') ?: "lib3270j")
+                    when {
+                        record.level.intValue() >= java.util.logging.Level.SEVERE.intValue() ->
+                            android.util.Log.e(tag, msg, record.thrown)
+                        record.level.intValue() >= java.util.logging.Level.WARNING.intValue() ->
+                            android.util.Log.w(tag, msg, record.thrown)
+                        record.level.intValue() >= java.util.logging.Level.INFO.intValue() ->
+                            android.util.Log.i(tag, msg, record.thrown)
+                        else ->
+                            android.util.Log.d(tag, msg, record.thrown)
+                    }
+                }
+                override fun flush() {}
+                override fun close() {}
+            })
+        }
+    }
+
     private val viewModel: TerminalViewModel by viewModels()
     private val isShiftPressedState = mutableStateOf(false)
 
@@ -66,68 +99,280 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    private val log = java.util.logging.Logger.getLogger("a3270-MainActivity")
+    private var deadKey: Int = 0
+
+    private fun getEffectiveUnicodeChar(event: KeyEvent): Int {
+        val cleanMeta = event.metaState and (
+            KeyEvent.META_SHIFT_ON or
+            KeyEvent.META_SHIFT_LEFT_ON or
+            KeyEvent.META_SHIFT_RIGHT_ON or
+            KeyEvent.META_CAPS_LOCK_ON
+        )
+
+        // 1. Try getUnicodeChar with cleanMeta
+        var u = event.getUnicodeChar(cleanMeta)
+        if (u > 0) return u
+
+        // 2. Try unicodeChar property
+        u = event.unicodeChar
+        if (u > 0) return u
+
+        // 3. Try KeyCharacterMap with cleanMeta
+        val kcm = event.keyCharacterMap ?: KeyCharacterMap.load(KeyCharacterMap.VIRTUAL_KEYBOARD)
+        u = kcm.get(event.keyCode, cleanMeta)
+        if (u > 0) return u
+
+        // 4. Try KeyCharacterMap with meta = 0
+        u = kcm.get(event.keyCode, 0)
+        if (u > 0) {
+            val shift = event.isShiftPressed || (event.metaState and KeyEvent.META_SHIFT_ON != 0)
+            if (shift) {
+                val c = u.toChar()
+                if (c.isLowerCase()) return c.uppercaseChar().code
+            }
+            return u
+        }
+
+        // 5. Try displayLabel as fallback
+        val label = event.displayLabel
+        if (label >= ' ') {
+            val shift = event.isShiftPressed || (event.metaState and KeyEvent.META_SHIFT_ON != 0)
+            return if (shift) label.uppercaseChar().code else label.lowercaseChar().code
+        }
+
+        return 0
+    }
+
     override fun dispatchKeyEvent(event: KeyEvent): Boolean {
         val shift = event.isShiftPressed || (event.metaState and KeyEvent.META_SHIFT_ON != 0)
         if (isShiftPressedState.value != shift) {
             isShiftPressedState.value = shift
         }
 
+        // Handle string / multi-character input (e.g. adb input text, barcode scanners, fast text input)
+        if (event.action == KeyEvent.ACTION_MULTIPLE) {
+            if (event.keyCode == KeyEvent.KEYCODE_UNKNOWN) {
+                val chars = event.characters
+                if (!chars.isNullOrEmpty()) {
+                    viewModel.typeString(chars)
+                    return true
+                }
+            } else {
+                val unicode = getEffectiveUnicodeChar(event)
+                if (unicode >= 32) {
+                    val count = maxOf(1, event.repeatCount)
+                    viewModel.typeString(unicode.toChar().toString().repeat(count))
+                    return true
+                }
+            }
+        }
+
         if (event.action == KeyEvent.ACTION_DOWN) {
             val keyCode = event.keyCode
+            val ctrl = event.isCtrlPressed || (event.metaState and KeyEvent.META_CTRL_ON != 0)
+            val alt = event.isAltPressed || (event.metaState and KeyEvent.META_ALT_ON != 0)
+
+            // 1. Function Keys (F1..F12 -> PF1..PF12 or PF13..PF24 with Shift or Alt)
             if (keyCode in KeyEvent.KEYCODE_F1..KeyEvent.KEYCODE_F12) {
                 val fNum = keyCode - KeyEvent.KEYCODE_F1 + 1
-                val pfNum = if (shift) fNum + 12 else fNum
+                val pfNum = if (shift || alt) fNum + 12 else fNum
                 val pfAids = intArrayOf(
-                    org.lib3270j.protocol.DS3270Constants.AID_PF1, org.lib3270j.protocol.DS3270Constants.AID_PF2,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF3, org.lib3270j.protocol.DS3270Constants.AID_PF4,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF5, org.lib3270j.protocol.DS3270Constants.AID_PF6,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF7, org.lib3270j.protocol.DS3270Constants.AID_PF8,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF9, org.lib3270j.protocol.DS3270Constants.AID_PF10,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF11, org.lib3270j.protocol.DS3270Constants.AID_PF12,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF13, org.lib3270j.protocol.DS3270Constants.AID_PF14,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF15, org.lib3270j.protocol.DS3270Constants.AID_PF16,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF17, org.lib3270j.protocol.DS3270Constants.AID_PF18,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF19, org.lib3270j.protocol.DS3270Constants.AID_PF20,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF21, org.lib3270j.protocol.DS3270Constants.AID_PF22,
-                    org.lib3270j.protocol.DS3270Constants.AID_PF23, org.lib3270j.protocol.DS3270Constants.AID_PF24
+                    AID_PF1, AID_PF2, AID_PF3, AID_PF4, AID_PF5, AID_PF6,
+                    AID_PF7, AID_PF8, AID_PF9, AID_PF10, AID_PF11, AID_PF12,
+                    AID_PF13, AID_PF14, AID_PF15, AID_PF16, AID_PF17, AID_PF18,
+                    AID_PF19, AID_PF20, AID_PF21, AID_PF22, AID_PF23, AID_PF24
                 )
                 viewModel.sendAid(pfAids[pfNum - 1])
                 if (shift) {
                     isShiftPressedState.value = false
                 }
                 return true
-            } else if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT) {
-                viewModel.cursorLeft()
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_DPAD_UP) {
-                viewModel.cursorUp()
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_DPAD_DOWN) {
-                viewModel.cursorDown()
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {
-                viewModel.cursorRight()
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_ENTER || keyCode == KeyEvent.KEYCODE_NUMPAD_ENTER) {
-                viewModel.sendAid(AID_ENTER)
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_TAB) {
-                if (event.isShiftPressed) {
-                    viewModel.backTab()
-                } else {
-                    viewModel.tab()
+            }
+
+            // 2. Ctrl Shortcuts
+            if (ctrl) {
+                when (keyCode) {
+                    KeyEvent.KEYCODE_V -> {
+                        pasteFromClipboard()
+                        return true
+                    }
+                    KeyEvent.KEYCODE_R -> {
+                        viewModel.resetKeyboard()
+                        return true
+                    }
+                    KeyEvent.KEYCODE_L -> {
+                        viewModel.sendAid(AID_CLEAR)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_Z -> {
+                        viewModel.sendAid(AID_PA1)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_HOME -> {
+                        viewModel.cursorHome()
+                        return true
+                    }
+                    KeyEvent.KEYCODE_MOVE_END -> {
+                        viewModel.eraseEof()
+                        return true
+                    }
                 }
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_DEL) {
-                viewModel.backspace()
-                return true
-            } else if (keyCode == KeyEvent.KEYCODE_ESCAPE) {
-                viewModel.resetKeyboard()
+            }
+
+            // 3. Alt Shortcuts (PA keys, Clear, Reset)
+            if (alt) {
+                when (keyCode) {
+                    KeyEvent.KEYCODE_1 -> {
+                        viewModel.sendAid(AID_PA1)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_2 -> {
+                        viewModel.sendAid(AID_PA2)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_3 -> {
+                        viewModel.sendAid(AID_PA3)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_C -> {
+                        viewModel.sendAid(AID_CLEAR)
+                        return true
+                    }
+                    KeyEvent.KEYCODE_R -> {
+                        viewModel.resetKeyboard()
+                        return true
+                    }
+                }
+            }
+
+            // 4. Shift Shortcuts
+            if (shift && keyCode == KeyEvent.KEYCODE_INSERT) {
+                pasteFromClipboard()
                 return true
             }
+
+            // 5. Standard Navigation & Special Keys
+            when (keyCode) {
+                KeyEvent.KEYCODE_DPAD_LEFT -> {
+                    viewModel.cursorLeft()
+                    return true
+                }
+                KeyEvent.KEYCODE_DPAD_UP -> {
+                    viewModel.cursorUp()
+                    return true
+                }
+                KeyEvent.KEYCODE_DPAD_DOWN -> {
+                    viewModel.cursorDown()
+                    return true
+                }
+                KeyEvent.KEYCODE_DPAD_RIGHT -> {
+                    viewModel.cursorRight()
+                    return true
+                }
+                KeyEvent.KEYCODE_MOVE_HOME -> {
+                    viewModel.cursorHome()
+                    return true
+                }
+                KeyEvent.KEYCODE_MOVE_END -> {
+                    viewModel.eraseEof()
+                    return true
+                }
+                KeyEvent.KEYCODE_PAGE_UP -> {
+                    viewModel.sendAid(AID_PF7)
+                    return true
+                }
+                KeyEvent.KEYCODE_PAGE_DOWN -> {
+                    viewModel.sendAid(AID_PF8)
+                    return true
+                }
+                KeyEvent.KEYCODE_ENTER, KeyEvent.KEYCODE_NUMPAD_ENTER -> {
+                    viewModel.sendAid(AID_ENTER)
+                    return true
+                }
+                KeyEvent.KEYCODE_TAB -> {
+                    if (shift) {
+                        viewModel.backTab()
+                        isShiftPressedState.value = false
+                    } else {
+                        viewModel.tab()
+                    }
+                    return true
+                }
+                KeyEvent.KEYCODE_DEL -> {
+                    viewModel.backspace()
+                    return true
+                }
+                KeyEvent.KEYCODE_FORWARD_DEL -> {
+                    viewModel.deleteChar()
+                    return true
+                }
+                KeyEvent.KEYCODE_ESCAPE -> {
+                    if (shift) {
+                        viewModel.sendAid(AID_CLEAR)
+                        isShiftPressedState.value = false
+                    } else {
+                        viewModel.resetKeyboard()
+                    }
+                    return true
+                }
+                KeyEvent.KEYCODE_BREAK -> {
+                    viewModel.sendAid(AID_PA1)
+                    return true
+                }
+            }
+
+            // 6. Alphanumeric & Symbol Character Input
+            val unicode = getEffectiveUnicodeChar(event)
+            log.info("dispatchKeyEvent DOWN: keyCode=$keyCode, metaState=${event.metaState}, unicode=$unicode, char='${if (unicode > 0) unicode.toChar() else ' '}'")
+            if (unicode > 0) {
+                if ((unicode and KeyCharacterMap.COMBINING_ACCENT) != 0) {
+                    deadKey = unicode and KeyCharacterMap.COMBINING_ACCENT_MASK
+                    return true
+                }
+                val charToType = if (deadKey != 0) {
+                    val combined = KeyCharacterMap.getDeadChar(deadKey, unicode)
+                    deadKey = 0
+                    if (combined != 0) combined.toChar() else unicode.toChar()
+                } else {
+                    unicode.toChar()
+                }
+                if (charToType >= ' ') {
+                    log.info("dispatchKeyEvent typing char: '$charToType'")
+                    viewModel.typeString(charToType.toString())
+                    return true
+                }
+            } else {
+                log.info("dispatchKeyEvent unhandled DOWN keyCode=$keyCode, metaState=${event.metaState}")
+            }
         }
+
+        if (event.action == KeyEvent.ACTION_UP) {
+            when (event.keyCode) {
+                KeyEvent.KEYCODE_SHIFT_LEFT, KeyEvent.KEYCODE_SHIFT_RIGHT,
+                KeyEvent.KEYCODE_ALT_LEFT, KeyEvent.KEYCODE_ALT_RIGHT,
+                KeyEvent.KEYCODE_CTRL_LEFT, KeyEvent.KEYCODE_CTRL_RIGHT -> {
+                    // Let super handle modifier tracking
+                }
+                else -> {
+                    return true
+                }
+            }
+        }
+
         return super.dispatchKeyEvent(event)
     }
+
+    private fun pasteFromClipboard() {
+        val clipboard = getSystemService(Context.CLIPBOARD_SERVICE) as? android.content.ClipboardManager
+        val clip = clipboard?.primaryClip
+        if (clip != null && clip.itemCount > 0) {
+            val text = clip.getItemAt(0)?.coerceToText(this)?.toString()
+            if (!text.isNullOrEmpty()) {
+                viewModel.pasteString(text)
+            }
+        }
+    }
 }
 
 @Composable
@@ -147,6 +392,12 @@ fun MainScreen(
     val screenVersion by viewModel.screenVersion.collectAsState()
     val maskHiddenInput by viewModel.maskHiddenInput.collectAsState()
     val cursorBlink by viewModel.cursorBlink.collectAsState()
+    val hapticFeedback by viewModel.hapticFeedback.collectAsState()
+    val verifyCerts by viewModel.verifyCerts.collectAsState()
+    val defaultGraphicsMode by viewModel.defaultGraphicsMode.collectAsState()
+    val isTlsActive by viewModel.isTlsActive.collectAsState()
+    val isTlsVerified by viewModel.isTlsVerified.collectAsState()
+    val untrustedCertPrompt by viewModel.untrustedCertPrompt.collectAsState()
     val ftState by viewModel.ftState.collectAsState()
 
     var showConnectDialog by remember { mutableStateOf(false) }
@@ -173,7 +424,17 @@ fun MainScreen(
     LaunchedEffect(Unit) {
         val autoHost = HostStorage.getAutoConnectHost(context)
         if (autoHost != null && !connectionState.isConnected()) {
-            viewModel.connect(autoHost.host, autoHost.port, autoHost.model, autoHost.luName, autoHost.hostType)
+            viewModel.connect(
+                autoHost.host,
+                autoHost.port,
+                autoHost.model,
+                autoHost.luName,
+                autoHost.hostType,
+                autoHost.useTls,
+                autoHost.tlsVerifyCert,
+                autoHost.tn3270e,
+                autoHost.graphicsMode
+            )
         }
     }
 
@@ -203,6 +464,8 @@ fun MainScreen(
                 cols = cols,
                 cursorAddr = cursorAddr,
                 screenVersion = screenVersion,
+                programSymbolManager = viewModel.getClient()?.programSymbolManager,
+                graphicsPlane = viewModel.getClient()?.graphicsPlane,
                 maskHiddenFields = maskHiddenInput,
                 blinkCursor = cursorBlink,
                 onTapAddress = { addr ->
@@ -249,6 +512,7 @@ fun MainScreen(
             TwoRowKeyBar(
                 connectionState = connectionState,
                 isShiftPressed = isShiftPressed,
+                hapticFeedbackEnabled = hapticFeedback,
                 onClearShift = onClearShift,
                 onConnectClick = { showConnectDialog = true },
                 onDisconnectClick = { viewModel.disconnect() },
@@ -296,7 +560,10 @@ fun MainScreen(
                 oiaText = oiaText,
                 cursorAddr = cursorAddr,
                 rows = rows,
-                cols = cols
+                cols = cols,
+                isTls = isTlsActive,
+                isTlsVerified = isTlsVerified,
+                graphicsMode = defaultGraphicsMode
             )
         }
     }
@@ -304,9 +571,9 @@ fun MainScreen(
     if (showConnectDialog) {
         ConnectDialog(
             onDismiss = { showConnectDialog = false },
-            onConnect = { host, port, model, luName, hostType ->
+            onConnect = { host, port, model, luName, hostType, useTls, tlsVerifyCert, tn3270e, graphicsMode ->
                 showConnectDialog = false
-                viewModel.connect(host, port, model, luName, hostType)
+                viewModel.connect(host, port, model, luName, hostType, useTls, tlsVerifyCert, tn3270e, graphicsMode)
                 terminalInputViewRef?.showSoftKeyboard()
             }
         )
@@ -318,9 +585,10 @@ fun MainScreen(
             ftProgressState = ftState,
             onDismiss = { showFtDialog = false },
             onStartTransfer = { config ->
-                val error = viewModel.startFileTransfer(config)
-                if (error != null) {
-                    Toast.makeText(context, error, Toast.LENGTH_LONG).show()
+                viewModel.startFileTransfer(config) { error ->
+                    if (error != null) {
+                        Toast.makeText(context, error, Toast.LENGTH_LONG).show()
+                    }
                 }
             },
             onCancelTransfer = {
@@ -333,12 +601,31 @@ fun MainScreen(
         SettingsDialog(
             initialMaskHiddenInput = maskHiddenInput,
             initialCursorBlink = cursorBlink,
+            initialHapticFeedback = hapticFeedback,
+            initialVerifyCerts = verifyCerts,
+            initialDefaultGraphicsMode = defaultGraphicsMode,
             onDismiss = { showSettingsDialog = false },
-            onSave = { mask, blink ->
+            onSave = { mask, blink, haptic, verify, gfx ->
                 showSettingsDialog = false
-                viewModel.updateSettings(mask, blink)
+                viewModel.updateSettings(mask, blink, haptic, verify, gfx)
                 terminalInputViewRef?.showSoftKeyboard()
             }
         )
     }
+
+    val prompt = untrustedCertPrompt
+    if (prompt != null) {
+        UntrustedCertificateDialog(
+            host = prompt.host,
+            port = prompt.port,
+            chain = prompt.chain,
+            exception = prompt.exception,
+            onAccept = {
+                viewModel.resolveUntrustedCert(true)
+            },
+            onReject = {
+                viewModel.resolveUntrustedCert(false)
+            }
+        )
+    }
 }

src/main/java/org/pubvm/a3270/TerminalViewModel.kt

@@ -10,6 +10,7 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.lib3270j.ConnectionConfig
 import org.lib3270j.ConnectionState
 import org.lib3270j.Telnet3270Client
@@ -31,16 +32,29 @@ sealed interface TerminalInputAction {
     data class TypeText(val text: String) : TerminalInputAction
     data class SendAid(val aidCode: Int) : TerminalInputAction
     data object Backspace : TerminalInputAction
+    data object DeleteChar : TerminalInputAction
     data object Tab : TerminalInputAction
     data object BackTab : TerminalInputAction
     data object CursorLeft : TerminalInputAction
     data object CursorRight : TerminalInputAction
     data object CursorUp : TerminalInputAction
     data object CursorDown : TerminalInputAction
+    data object CursorHome : TerminalInputAction
+    data object EraseEof : TerminalInputAction
+    data object EraseInput : TerminalInputAction
+    data object Newline : TerminalInputAction
     data object Reset : TerminalInputAction
     data class SetCursor(val baddr: Int) : TerminalInputAction
 }
 
+data class UntrustedCertPromptState(
+    val host: String,
+    val port: Int,
+    val chain: Array<java.security.cert.X509Certificate>?,
+    val exception: java.security.cert.CertificateException?,
+    val deferred: kotlinx.coroutines.CompletableDeferred<Boolean>
+)
+
 data class FTProgressState(
     val isActive: Boolean = false,
     val isRunning: Boolean = false,
@@ -92,17 +106,38 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
     private val _cursorBlink = MutableStateFlow(AppSettings.isCursorBlinkEnabled(application))
     val cursorBlink: StateFlow<Boolean> = _cursorBlink.asStateFlow()
 
+    private val _hapticFeedback = MutableStateFlow(AppSettings.isHapticFeedbackEnabled(application))
+    val hapticFeedback: StateFlow<Boolean> = _hapticFeedback.asStateFlow()
+
+    private val _verifyCerts = MutableStateFlow(AppSettings.isVerifyCertsEnabled(application))
+    val verifyCerts: StateFlow<Boolean> = _verifyCerts.asStateFlow()
+
+    private val _defaultGraphicsMode = MutableStateFlow(AppSettings.getDefaultGraphicsMode(application))
+    val defaultGraphicsMode: StateFlow<String> = _defaultGraphicsMode.asStateFlow()
+
+    private val _isTlsActive = MutableStateFlow(false)
+    val isTlsActive: StateFlow<Boolean> = _isTlsActive.asStateFlow()
+
+    private val _isTlsVerified = MutableStateFlow(true)
+    val isTlsVerified: StateFlow<Boolean> = _isTlsVerified.asStateFlow()
+
+    private val _untrustedCertPrompt = MutableStateFlow<UntrustedCertPromptState?>(null)
+    val untrustedCertPrompt: StateFlow<UntrustedCertPromptState?> = _untrustedCertPrompt.asStateFlow()
+
     // File Transfer State
     private var fileTransferCoordinator: FileTransfer? = null
     private val _ftState = MutableStateFlow(FTProgressState())
     val ftState: StateFlow<FTProgressState> = _ftState.asStateFlow()
 
+    @Volatile
     private var client: Telnet3270Client? = null
     var currentHost: String = ""
         private set
     var activeHostType: String = "TSO"
         private set
 
+    fun getClient(): Telnet3270Client? = client
+
     private var lastScreenContentHash: Int = 0
     private var hasInitialScreenLoaded: Boolean = false
 
@@ -133,6 +168,7 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         try {
             when (action) {
                 is TerminalInputAction.TypeText -> {
+                    log.info("TypeText: text='${action.text}', curAddr=${buf.cursorAddress}, formatted=${buf.isFormatted}")
                     ip.isKeyboardLocked = false
                     for (ch in action.text) {
                         if (ch == '\n' || ch == '\r') {
@@ -148,6 +184,7 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                                 }
                             }
                             ip.typeCharacter(ch)
+                            log.info("After typeCharacter('$ch'): newAddr=${buf.cursorAddress}, cellChar='${buf.getCell(curAddr).ucs4}'")
                         }
                     }
                 }
@@ -159,6 +196,10 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                     ip.isKeyboardLocked = false
                     ip.backspace()
                 }
+                is TerminalInputAction.DeleteChar -> {
+                    ip.isKeyboardLocked = false
+                    ip.deleteChar()
+                }
                 is TerminalInputAction.Tab -> {
                     ip.tab()
                 }
@@ -177,6 +218,20 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                 is TerminalInputAction.CursorDown -> {
                     ip.cursorDown()
                 }
+                is TerminalInputAction.CursorHome -> {
+                    ip.cursorHome()
+                }
+                is TerminalInputAction.EraseEof -> {
+                    ip.isKeyboardLocked = false
+                    ip.eraseEof()
+                }
+                is TerminalInputAction.EraseInput -> {
+                    ip.isKeyboardLocked = false
+                    ip.eraseInput()
+                }
+                is TerminalInputAction.Newline -> {
+                    ip.newline()
+                }
                 is TerminalInputAction.Reset -> {
                     ip.reset()
                 }
@@ -191,15 +246,42 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         }
     }
 
-    fun updateSettings(maskHidden: Boolean, blink: Boolean) {
-        AppSettings.setMaskHiddenInputEnabled(getApplication(), maskHidden)
-        AppSettings.setCursorBlinkEnabled(getApplication(), blink)
-        _maskHiddenInput.value = maskHidden
-        _cursorBlink.value = blink
+    fun resolveUntrustedCert(accept: Boolean) {
+        try {
+            val prompt = _untrustedCertPrompt.value
+            if (prompt != null) {
+                prompt.deferred.complete(accept)
+                _untrustedCertPrompt.value = null
+            }
+        } catch (t: Throwable) {
+            log.warning("Error resolving untrusted cert: ${t.message}")
+        }
     }
 
-    fun connect(host: String, port: Int = 23, modelNum: Int = 2, luName: String = "", hostType: String = "TSO") {
-        if (_connectionState.value.isConnected()) return
+    fun updateSettings(maskHidden: Boolean, blink: Boolean, haptic: Boolean, verifyCertsVal: Boolean = true, defaultGraphicsVal: String = "BOTH") {
+        AppSettings.setMaskHiddenInputEnabled(getApplication(), maskHidden)
+        AppSettings.setCursorBlinkEnabled(getApplication(), blink)
+        AppSettings.setHapticFeedbackEnabled(getApplication(), haptic)
+        AppSettings.setVerifyCertsEnabled(getApplication(), verifyCertsVal)
+        AppSettings.setDefaultGraphicsMode(getApplication(), defaultGraphicsVal)
+        _maskHiddenInput.value = maskHidden
+        _cursorBlink.value = blink
+        _hapticFeedback.value = haptic
+        _verifyCerts.value = verifyCertsVal
+        _defaultGraphicsMode.value = defaultGraphicsVal
+    }
+
+    fun connect(
+        host: String,
+        port: Int = 23,
+        modelNum: Int = 2,
+        luName: String = "",
+        hostType: String = "TSO",
+        useTls: Boolean = false,
+        tlsVerifyCert: Boolean = true,
+        tn3270e: Boolean = true,
+        graphicsModeStr: String = "BOTH"
+    ) {
         currentHost = host
         activeHostType = hostType
         lastScreenContentHash = 0
@@ -209,7 +291,14 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
 
         viewModelScope.launch(Dispatchers.IO) {
             try {
-                _oiaText.value = "Connecting to $host:$port..."
+                // Always disconnect any existing client before establishing a new connection
+                if (client != null || _connectionState.value.isConnected()) {
+                    try {
+                        client?.disconnect()
+                    } catch (_: Exception) {}
+                    client = null
+                    _connectionState.value = ConnectionState.NOT_CONNECTED
+                }
 
                 val model = when (modelNum) {
                     3 -> TerminalModel.IBM_3279_3
@@ -218,10 +307,52 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                     else -> TerminalModel.IBM_3279_2
                 }
 
-                val config = ConnectionConfig(host, port, model).apply {
+                val parsedConfig = ConnectionConfig.parseHostString(host, port, model)
+                val effectiveHost = parsedConfig.host
+                val effectivePort = parsedConfig.port
+                val effectiveTls = useTls || parsedConfig.isUseTls
+                val effectiveTn3270e = tn3270e && parsedConfig.isTn3270eEnabled
+                val globalVerify = AppSettings.isVerifyCertsEnabled(getApplication())
+                val effectiveVerify = tlsVerifyCert && globalVerify
+                val gMode = org.lib3270j.graphics.GraphicsMode.fromString(graphicsModeStr)
+
+                _isTlsActive.value = effectiveTls
+                _isTlsVerified.value = effectiveVerify
+                _oiaText.value = "Connecting to $effectiveHost:$effectivePort" + (if (effectiveTls) " [TLS]" else "") + "..."
+
+                val config = ConnectionConfig(effectiveHost, effectivePort, model).apply {
                     if (luName.isNotBlank()) {
                         setLuName(luName)
                     }
+                    isUseTls = effectiveTls
+                    isTlsVerifyCert = effectiveVerify
+                    isTn3270eEnabled = effectiveTn3270e
+                    graphicsMode = gMode
+                }
+
+                config.certificateVerifier = org.lib3270j.tls.TlsCertificateVerifier { chain, _, exception ->
+                    if (!AppSettings.isVerifyCertsEnabled(getApplication())) {
+                        log.info("Certificate verification bypassed via global AppSettings")
+                        return@TlsCertificateVerifier true
+                    }
+                    log.info("Prompting user for untrusted certificate: $effectiveHost:$effectivePort")
+                    val deferred = kotlinx.coroutines.CompletableDeferred<Boolean>()
+                    _untrustedCertPrompt.value = UntrustedCertPromptState(
+                        host = effectiveHost,
+                        port = effectivePort,
+                        chain = chain,
+                        exception = exception,
+                        deferred = deferred
+                    )
+                    val accepted = try {
+                        kotlinx.coroutines.runBlocking { deferred.await() }
+                    } catch (t: Throwable) {
+                        log.warning("Certificate verifier prompt interrupted or failed: ${t.message}")
+                        false
+                    } finally {
+                        _untrustedCertPrompt.value = null
+                    }
+                    accepted
                 }
 
                 val newClient = Telnet3270Client(config)
@@ -230,8 +361,11 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                 newClient.addConnectionListener(object : ConnectionListener {
                     override fun onConnectionStateChanged(oldState: ConnectionState, newState: ConnectionState) {
                         _connectionState.value = newState
+                        val tlsSuffix = if (effectiveTls) {
+                            if (effectiveVerify) " [🔒 TLS]" else " [🔓 TLS/Unverified]"
+                        } else ""
                         _oiaText.value = if (newState.isFullSession()) {
-                            "3270 Connected ($host - $activeHostType)"
+                            "3270 Connected ($effectiveHost - $activeHostType)$tlsSuffix"
                         } else if (newState.isHalfConnected()) {
                             "Connecting..."
                         } else {
@@ -292,10 +426,10 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
                 _screenBuffer.value = newClient.screenBuffer
 
                 newClient.connect()
-            } catch (e: Exception) {
+            } catch (e: Throwable) {
                 log.severe("Failed to connect: ${e.message}")
                 _connectionState.value = ConnectionState.NOT_CONNECTED
-                _oiaText.value = "Failed: ${e.localizedMessage ?: e.message}"
+                _oiaText.value = "Failed: ${e.localizedMessage ?: e.message ?: "Connection error"}"
             }
         }
     }
@@ -316,77 +450,105 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         }
     }
 
-    fun startFileTransfer(config: FTConfig): String? {
-        val c = client ?: return "Terminal is not connected."
-
-        // Resolve local path if relative (default to app files or download directory)
-        val rawPath = config.localFilename
-        if (!rawPath.startsWith("/")) {
-            val appFilesDir = getApplication<Application>().getExternalFilesDir(null) ?: getApplication<Application>().filesDir
-            val resolvedFile = File(appFilesDir, rawPath)
-            config.localFilename = resolvedFile.absolutePath
+    fun startFileTransfer(config: FTConfig, onResult: (String?) -> Unit = {}) {
+        val c = client
+        if (c == null || !_connectionState.value.isConnected()) {
+            val err = "Terminal is not connected."
+            _ftState.value = FTProgressState(isActive = false, statusMessage = err, isError = true)
+            onResult(err)
+            return
         }
 
-        if (fileTransferCoordinator == null) {
-            fileTransferCoordinator = FileTransfer(c, object : FileTransfer.FileTransferCallback {
-                override fun onTransferStarted() {
-                    _ftState.value = FTProgressState(
-                        isActive = true,
-                        isRunning = false,
-                        bytesTransferred = 0L,
-                        statusMessage = "Starting IND\$FILE transfer..."
-                    )
+        viewModelScope.launch(Dispatchers.IO) {
+            try {
+                // Resolve local path if relative (default to app files or download directory)
+                val rawPath = config.localFilename
+                if (!rawPath.startsWith("/")) {
+                    val appFilesDir = getApplication<Application>().getExternalFilesDir(null) ?: getApplication<Application>().filesDir
+                    val resolvedFile = File(appFilesDir, rawPath)
+                    config.localFilename = resolvedFile.absolutePath
                 }
 
-                override fun onTransferRunning() {
-                    _ftState.value = _ftState.value.copy(
-                        isRunning = true,
-                        statusMessage = "Transfer in progress..."
-                    )
+                if (fileTransferCoordinator == null) {
+                    fileTransferCoordinator = FileTransfer(c, object : FileTransfer.FileTransferCallback {
+                        override fun onTransferStarted() {
+                            _ftState.value = FTProgressState(
+                                isActive = true,
+                                isRunning = false,
+                                bytesTransferred = 0L,
+                                statusMessage = "Starting IND\$FILE transfer..."
+                            )
+                        }
+
+                        override fun onTransferRunning() {
+                            _ftState.value = _ftState.value.copy(
+                                isRunning = true,
+                                statusMessage = "Transfer in progress..."
+                            )
+                        }
+
+                        override fun onBytesTransferred(bytes: Long) {
+                            _ftState.value = _ftState.value.copy(
+                                bytesTransferred = bytes,
+                                statusMessage = "Transferring: $bytes bytes"
+                            )
+                        }
+
+                        override fun onTransferComplete(message: String) {
+                            _ftState.value = FTProgressState(
+                                isActive = false,
+                                isRunning = false,
+                                bytesTransferred = _ftState.value.bytesTransferred,
+                                statusMessage = message,
+                                isError = false
+                            )
+                        }
+
+                        override fun onTransferAborted(error: String) {
+                            _ftState.value = FTProgressState(
+                                isActive = false,
+                                isRunning = false,
+                                bytesTransferred = _ftState.value.bytesTransferred,
+                                statusMessage = "Transfer failed: $error",
+                                isError = true
+                            )
+                        }
+                    })
                 }
 
-                override fun onBytesTransferred(bytes: Long) {
-                    _ftState.value = _ftState.value.copy(
-                        bytesTransferred = bytes,
-                        statusMessage = "Transferring: $bytes bytes"
-                    )
-                }
-
-                override fun onTransferComplete(message: String) {
+                val err = fileTransferCoordinator?.startTransfer(config)
+                if (err != null) {
                     _ftState.value = FTProgressState(
                         isActive = false,
-                        isRunning = false,
-                        bytesTransferred = _ftState.value.bytesTransferred,
-                        statusMessage = message,
-                        isError = false
-                    )
-                }
-
-                override fun onTransferAborted(error: String) {
-                    _ftState.value = FTProgressState(
-                        isActive = false,
-                        isRunning = false,
-                        bytesTransferred = _ftState.value.bytesTransferred,
-                        statusMessage = "Transfer failed: $error",
+                        statusMessage = "Error: $err",
                         isError = true
                     )
                 }
-            })
+                withContext(Dispatchers.Main) {
+                    onResult(err)
+                }
+            } catch (e: Exception) {
+                log.warning("Error in startFileTransfer: ${e.message}")
+                _ftState.value = FTProgressState(
+                    isActive = false,
+                    statusMessage = "Transfer error: ${e.message}",
+                    isError = true
+                )
+                withContext(Dispatchers.Main) {
+                    onResult(e.message)
+                }
+            }
         }
-
-        val err = fileTransferCoordinator?.startTransfer(config)
-        if (err != null) {
-            _ftState.value = FTProgressState(
-                isActive = false,
-                statusMessage = "Error: $err",
-                isError = true
-            )
-        }
-        return err
     }
 
     fun cancelFileTransfer() {
-        fileTransferCoordinator?.cancel()
+        viewModelScope.launch(Dispatchers.IO) {
+            try {
+                fileTransferCoordinator?.cancel()
+            } catch (e: Exception) {
+                log.warning("Error cancelling transfer: ${e.message}")
+            }
+        }
     }
 
     fun typeChar(ch: Char) {
@@ -409,6 +571,10 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         inputChannel.trySend(TerminalInputAction.Backspace)
     }
 
+    fun deleteChar() {
+        inputChannel.trySend(TerminalInputAction.DeleteChar)
+    }
+
     fun tab() {
         inputChannel.trySend(TerminalInputAction.Tab)
     }
@@ -421,6 +587,18 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         inputChannel.trySend(TerminalInputAction.Reset)
     }
 
+    fun eraseEof() {
+        inputChannel.trySend(TerminalInputAction.EraseEof)
+    }
+
+    fun eraseInput() {
+        inputChannel.trySend(TerminalInputAction.EraseInput)
+    }
+
+    fun newline() {
+        inputChannel.trySend(TerminalInputAction.Newline)
+    }
+
     fun sendAid(aidCode: Int) {
         inputChannel.trySend(TerminalInputAction.SendAid(aidCode))
     }
@@ -445,6 +623,10 @@ class TerminalViewModel(application: Application) : AndroidViewModel(application
         inputChannel.trySend(TerminalInputAction.CursorRight)
     }
 
+    fun cursorHome() {
+        inputChannel.trySend(TerminalInputAction.CursorHome)
+    }
+
     private fun extractScreenSnippet(buf: ScreenBuffer?): String {
         if (buf == null) return "Mainframe screen update received"
         val rows = buf.rows

src/main/java/org/pubvm/a3270/storage/AppSettings.kt

@@ -7,6 +7,10 @@ object AppSettings {
     private const val PREFS_NAME = "a3270_settings"
     private const val KEY_MASK_HIDDEN_INPUT = "mask_hidden_input"
     private const val KEY_CURSOR_BLINK = "cursor_blink"
+    private const val KEY_HAPTIC_FEEDBACK = "haptic_feedback"
+
+    private const val KEY_VERIFY_CERTS = "verify_certs"
+    private const val KEY_DEFAULT_GRAPHICS_MODE = "default_graphics_mode"
 
     private fun getPrefs(context: Context): SharedPreferences {
         return context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
@@ -27,4 +31,28 @@ object AppSettings {
     fun setCursorBlinkEnabled(context: Context, enabled: Boolean) {
         getPrefs(context).edit().putBoolean(KEY_CURSOR_BLINK, enabled).apply()
     }
+
+    fun isHapticFeedbackEnabled(context: Context): Boolean {
+        return getPrefs(context).getBoolean(KEY_HAPTIC_FEEDBACK, true)
+    }
+
+    fun setHapticFeedbackEnabled(context: Context, enabled: Boolean) {
+        getPrefs(context).edit().putBoolean(KEY_HAPTIC_FEEDBACK, enabled).apply()
+    }
+
+    fun isVerifyCertsEnabled(context: Context): Boolean {
+        return getPrefs(context).getBoolean(KEY_VERIFY_CERTS, true)
+    }
+
+    fun setVerifyCertsEnabled(context: Context, enabled: Boolean) {
+        getPrefs(context).edit().putBoolean(KEY_VERIFY_CERTS, enabled).apply()
+    }
+
+    fun getDefaultGraphicsMode(context: Context): String {
+        return getPrefs(context).getString(KEY_DEFAULT_GRAPHICS_MODE, "BOTH") ?: "BOTH"
+    }
+
+    fun setDefaultGraphicsMode(context: Context, mode: String) {
+        getPrefs(context).edit().putString(KEY_DEFAULT_GRAPHICS_MODE, mode).apply()
+    }
 }

src/main/java/org/pubvm/a3270/storage/HostStorage.kt

@@ -14,7 +14,11 @@ data class SavedHost(
     val model: Int = 2,
     val luName: String = "",
     val autoConnect: Boolean = false,
-    val hostType: String = "TSO"
+    val hostType: String = "TSO",
+    val useTls: Boolean = false,
+    val tlsVerifyCert: Boolean = true,
+    val tn3270e: Boolean = true,
+    val graphicsMode: String = "BOTH"
 ) {
     fun toJson(): JSONObject {
         return JSONObject().apply {
@@ -26,6 +30,10 @@ data class SavedHost(
             put("luName", luName)
             put("autoConnect", autoConnect)
             put("hostType", hostType)
+            put("useTls", useTls)
+            put("tlsVerifyCert", tlsVerifyCert)
+            put("tn3270e", tn3270e)
+            put("graphicsMode", graphicsMode)
         }
     }
 
@@ -39,7 +47,11 @@ data class SavedHost(
                 model = json.optInt("model", 2),
                 luName = json.optString("luName", ""),
                 autoConnect = json.optBoolean("autoConnect", false),
-                hostType = json.optString("hostType", "TSO")
+                hostType = json.optString("hostType", "TSO"),
+                useTls = json.optBoolean("useTls", false),
+                tlsVerifyCert = json.optBoolean("tlsVerifyCert", true),
+                tn3270e = json.optBoolean("tn3270e", true),
+                graphicsMode = json.optString("graphicsMode", "BOTH")
             )
         }
     }
@@ -60,7 +72,13 @@ object HostStorage {
             val jsonArray = JSONArray(jsonStr)
             for (i in 0 until jsonArray.length()) {
                 val obj = jsonArray.getJSONObject(i)
-                list.add(SavedHost.fromJson(obj))
+                val saved = SavedHost.fromJson(obj)
+                val effective = if (saved.graphicsMode == "PROGRAMMED_SYMBOLS") {
+                    saved.copy(graphicsMode = "BOTH")
+                } else {
+                    saved
+                }
+                list.add(effective)
             }
         } catch (e: Exception) {
             e.printStackTrace()

src/main/java/org/pubvm/a3270/ui/ConnectDialog.kt

@@ -1,5 +1,6 @@
 package org.pubvm.a3270.ui
 
+import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
@@ -10,22 +11,34 @@ import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
-import androidx.compose.ui.focus.FocusRequester
-import androidx.compose.ui.focus.focusRequester
-import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.window.DialogProperties
 import org.pubvm.a3270.storage.HostStorage
 import org.pubvm.a3270.storage.SavedHost
 
 @Composable
 fun ConnectDialog(
     onDismiss: () -> Unit,
-    onConnect: (host: String, port: Int, model: Int, luName: String, hostType: String) -> Unit
+    onConnect: (
+        host: String,
+        port: Int,
+        model: Int,
+        luName: String,
+        hostType: String,
+        useTls: Boolean,
+        tlsVerifyCert: Boolean,
+        tn3270e: Boolean,
+        graphicsMode: String
+    ) -> Unit
 ) {
     val context = LocalContext.current
     var savedHosts by remember { mutableStateOf(HostStorage.getSavedHosts(context)) }
@@ -38,6 +51,10 @@ fun ConnectDialog(
     var luName by remember { mutableStateOf("") }
     var autoConnect by remember { mutableStateOf(false) }
     var hostType by remember { mutableStateOf("TSO") }
+    var useTls by remember { mutableStateOf(false) }
+    var tlsVerifyCert by remember { mutableStateOf(true) }
+    var tn3270e by remember { mutableStateOf(true) }
+    var graphicsMode by remember { mutableStateOf("BOTH") }
 
     fun loadProfile(saved: SavedHost) {
         selectedHostId = saved.id
@@ -48,6 +65,10 @@ fun ConnectDialog(
         luName = saved.luName
         autoConnect = saved.autoConnect
         hostType = saved.hostType
+        useTls = saved.useTls
+        tlsVerifyCert = saved.tlsVerifyCert
+        tn3270e = saved.tn3270e
+        graphicsMode = saved.graphicsMode
     }
 
     fun clearFields() {
@@ -59,10 +80,14 @@ fun ConnectDialog(
         luName = ""
         autoConnect = false
         hostType = "TSO"
+        useTls = false
+        tlsVerifyCert = true
+        tn3270e = true
+        graphicsMode = "BOTH"
     }
 
     fun saveCurrentProfile(): SavedHost? {
-        val port = portStr.toIntOrNull() ?: 23
+        val port = portStr.toIntOrNull() ?: if (useTls) 992 else 23
         if (host.isBlank()) return null
         val nameToSave = profileName.ifBlank { "${host.trim()}:$port" }
         val hostToSave = SavedHost(
@@ -73,7 +98,11 @@ fun ConnectDialog(
             model = modelNum,
             luName = luName.trim(),
             autoConnect = autoConnect,
-            hostType = hostType
+            hostType = hostType,
+            useTls = useTls,
+            tlsVerifyCert = tlsVerifyCert,
+            tn3270e = tn3270e,
+            graphicsMode = graphicsMode
         )
         HostStorage.saveHost(context, hostToSave)
         savedHosts = HostStorage.getSavedHosts(context)
@@ -90,20 +119,24 @@ fun ConnectDialog(
         keyboardController?.show()
     }
 
-    Dialog(onDismissRequest = onDismiss) {
+    Dialog(
+        onDismissRequest = onDismiss,
+        properties = DialogProperties(usePlatformDefaultWidth = false)
+    ) {
         Surface(
-            shape = RoundedCornerShape(12.dp),
+            shape = RoundedCornerShape(16.dp),
             color = Color(0xFF1E1E1E),
             tonalElevation = 6.dp,
             modifier = Modifier
-                .fillMaxWidth(0.96f)
-                .wrapContentHeight()
+                .fillMaxWidth(0.95f)
+                .heightIn(max = 680.dp)
+                .padding(vertical = 16.dp)
         ) {
             Column(
                 modifier = Modifier
-                    .fillMaxWidth()
-                    .padding(14.dp),
-                verticalArrangement = Arrangement.spacedBy(6.dp)
+                    .fillMaxSize()
+                    .padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
             ) {
                 // Title Row
                 Row(
@@ -111,12 +144,17 @@ fun ConnectDialog(
                     horizontalArrangement = Arrangement.SpaceBetween,
                     verticalAlignment = Alignment.CenterVertically
                 ) {
-                    Text("Connect / Manage Hosts", fontWeight = FontWeight.Bold, fontSize = 15.sp, color = Color.White)
+                    Text(
+                        "Connect / Manage Hosts",
+                        fontWeight = FontWeight.Bold,
+                        fontSize = 16.sp,
+                        color = Color.White
+                    )
                     TextButton(
                         onClick = { clearFields() },
-                        contentPadding = PaddingValues(horizontal = 6.dp, vertical = 2.dp)
+                        contentPadding = PaddingValues(horizontal = 8.dp, vertical = 2.dp)
                     ) {
-                        Text("+ New Profile", fontSize = 12.sp)
+                        Text("+ New Profile", fontSize = 12.sp, color = Color(0xFF339AF0))
                     }
                 }
 
@@ -124,26 +162,37 @@ fun ConnectDialog(
                 Box(
                     modifier = Modifier
                         .fillMaxWidth()
-                        .heightIn(max = 440.dp)
+                        .weight(1f, fill = false)
                 ) {
                     val scrollState = rememberScrollState()
                     Column(
                         modifier = Modifier
                             .fillMaxWidth()
                             .verticalScroll(scrollState),
-                        verticalArrangement = Arrangement.spacedBy(8.dp)
+                        verticalArrangement = Arrangement.spacedBy(10.dp)
                     ) {
                         // Saved Profiles List Section
                         if (savedHosts.isNotEmpty()) {
-                            Text("Saved Host Profiles:", fontSize = 11.sp, fontWeight = FontWeight.Bold, color = Color.Gray)
+                            Text(
+                                "Saved Host Profiles:",
+                                fontSize = 11.sp,
+                                fontWeight = FontWeight.Bold,
+                                color = Color.Gray
+                            )
                             Column(
                                 modifier = Modifier.fillMaxWidth(),
                                 verticalArrangement = Arrangement.spacedBy(4.dp)
                             ) {
                                 savedHosts.forEach { saved ->
                                     val isSelected = (saved.id == selectedHostId)
+                                    val tlsTag = if (saved.useTls) {
+                                        if (saved.tlsVerifyCert) " [🔒 TLS]" else " [🔓 TLS/NoVerify]"
+                                    } else ""
+                                    val eTag = if (!saved.tn3270e) " [Non-E]" else ""
+                                    val gfxTag = if (saved.graphicsMode != "NONE") " [GFX: ${saved.graphicsMode}]" else ""
+
                                     Surface(
-                                        shape = RoundedCornerShape(6.dp),
+                                        shape = RoundedCornerShape(8.dp),
                                         color = if (isSelected) Color(0xFF2C3E50) else Color(0xFF25262B),
                                         border = if (isSelected) androidx.compose.foundation.BorderStroke(1.dp, Color(0xFF339AF0)) else null,
                                         modifier = Modifier
@@ -153,7 +202,7 @@ fun ConnectDialog(
                                         Row(
                                             modifier = Modifier
                                                 .fillMaxWidth()
-                                                .padding(horizontal = 8.dp, vertical = 4.dp),
+                                                .padding(horizontal = 10.dp, vertical = 6.dp),
                                             horizontalArrangement = Arrangement.SpaceBetween,
                                             verticalAlignment = Alignment.CenterVertically
                                         ) {
@@ -161,12 +210,12 @@ fun ConnectDialog(
                                                 Text(
                                                     text = saved.name,
                                                     fontWeight = FontWeight.SemiBold,
-                                                    fontSize = 12.sp,
+                                                    fontSize = 13.sp,
                                                     color = Color.White
                                                 )
                                                 Text(
-                                                    text = "${saved.host}:${saved.port} (M${saved.model} - ${saved.hostType})" +
-                                                            if (saved.autoConnect) " [Auto-Connect]" else "",
+                                                    text = "${saved.host}:${saved.port} (M${saved.model} - ${saved.hostType})$tlsTag$eTag$gfxTag" +
+                                                            if (saved.autoConnect) " [Auto]" else "",
                                                     fontSize = 10.sp,
                                                     color = Color.LightGray
                                                 )
@@ -176,11 +225,21 @@ fun ConnectDialog(
                                                     onClick = {
                                                         loadProfile(saved)
                                                         val hostToConn = saveCurrentProfile() ?: saved
-                                                        onConnect(hostToConn.host, hostToConn.port, hostToConn.model, hostToConn.luName, hostToConn.hostType)
+                                                        onConnect(
+                                                            hostToConn.host,
+                                                            hostToConn.port,
+                                                            hostToConn.model,
+                                                            hostToConn.luName,
+                                                            hostToConn.hostType,
+                                                            hostToConn.useTls,
+                                                            hostToConn.tlsVerifyCert,
+                                                            hostToConn.tn3270e,
+                                                            hostToConn.graphicsMode
+                                                        )
                                                     },
-                                                    modifier = Modifier.size(28.dp)
+                                                    modifier = Modifier.size(32.dp)
                                                 ) {
-                                                    Text("▶", fontSize = 13.sp, color = Color(0xFF51CF66))
+                                                    Text("▶", fontSize = 14.sp, color = Color(0xFF51CF66))
                                                 }
                                                 IconButton(
                                                     onClick = {
@@ -190,20 +249,20 @@ fun ConnectDialog(
                                                             clearFields()
                                                         }
                                                     },
-                                                    modifier = Modifier.size(28.dp)
+                                                    modifier = Modifier.size(32.dp)
                                                 ) {
-                                                    Text("✕", fontSize = 12.sp, color = Color(0xFFFF6B6B))
+                                                    Text("✕", fontSize = 13.sp, color = Color(0xFFFF6B6B))
                                                 }
                                             }
                                         }
                                     }
                                 }
                             }
-                            HorizontalDivider(color = Color(0xFF373A40), modifier = Modifier.padding(vertical = 2.dp))
+                            HorizontalDivider(color = Color(0xFF373A40), modifier = Modifier.padding(vertical = 4.dp))
                         }
 
                         Text(
-                            text = if (selectedHostId != null) "Editing Profile:" else "New Profile Details:",
+                            text = if (selectedHostId != null) "Editing Profile:" else "Host Connection Details:",
                             fontSize = 11.sp,
                             fontWeight = FontWeight.Bold,
                             color = Color.Gray
@@ -217,74 +276,236 @@ fun ConnectDialog(
                             modifier = Modifier.fillMaxWidth()
                         )
 
-                        OutlinedTextField(
-                            value = host,
-                            onValueChange = { host = it },
-                            label = { Text("Host / IP Address") },
-                            singleLine = true,
-                            modifier = Modifier
-                                .fillMaxWidth()
-                                .focusRequester(focusRequester)
-                        )
-
-                        OutlinedTextField(
-                            value = portStr,
-                            onValueChange = { portStr = it },
-                            label = { Text("Port (default 23)") },
-                            singleLine = true,
-                            modifier = Modifier.fillMaxWidth()
-                        )
-
-                        // Terminal Model
                         Row(
-                            horizontalArrangement = Arrangement.spacedBy(6.dp),
-                            verticalAlignment = Alignment.CenterVertically
+                            modifier = Modifier.fillMaxWidth(),
+                            horizontalArrangement = Arrangement.spacedBy(8.dp)
                         ) {
-                            Text("Model:", fontSize = 11.sp, color = Color.Gray)
-                            listOf(2, 3, 4, 5).forEach { m ->
-                                FilterChip(
-                                    selected = (modelNum == m),
-                                    onClick = { modelNum = m },
-                                    label = { Text("M$m", fontSize = 11.sp) }
-                                )
+                            OutlinedTextField(
+                                value = host,
+                                onValueChange = { host = it },
+                                label = { Text("Host / IP Address") },
+                                singleLine = true,
+                                modifier = Modifier
+                                    .weight(0.68f)
+                                    .focusRequester(focusRequester)
+                            )
+                            OutlinedTextField(
+                                value = portStr,
+                                onValueChange = { portStr = it },
+                                label = { Text("Port") },
+                                singleLine = true,
+                                modifier = Modifier.weight(0.32f)
+                            )
+                        }
+
+                        // Terminal Model Selector
+                        Column(modifier = Modifier.fillMaxWidth()) {
+                            Text("Terminal Model:", fontSize = 11.sp, color = Color.Gray)
+                            Spacer(modifier = Modifier.height(4.dp))
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.spacedBy(6.dp)
+                            ) {
+                                listOf(
+                                    2 to "M2",
+                                    3 to "M3",
+                                    4 to "M4",
+                                    5 to "M5"
+                                ).forEach { (m, label) ->
+                                    val isSelected = (modelNum == m)
+                                    Surface(
+                                        shape = RoundedCornerShape(6.dp),
+                                        color = if (isSelected) Color(0xFF1C7ED6) else Color(0xFF2C2D30),
+                                        modifier = Modifier
+                                            .weight(1f)
+                                            .height(34.dp)
+                                            .clickable { modelNum = m }
+                                    ) {
+                                        Box(
+                                            contentAlignment = Alignment.Center,
+                                            modifier = Modifier.fillMaxSize().padding(horizontal = 2.dp)
+                                        ) {
+                                            Text(
+                                                text = label,
+                                                color = Color.White,
+                                                fontSize = 11.sp,
+                                                fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+                                                textAlign = TextAlign.Center
+                                            )
+                                        }
+                                    }
+                                }
                             }
                         }
 
                         // Host System Type (TSO, CMS, CICS)
-                        Row(
-                            horizontalArrangement = Arrangement.spacedBy(6.dp),
-                            verticalAlignment = Alignment.CenterVertically
-                        ) {
-                            Text("Host Type:", fontSize = 11.sp, color = Color.Gray)
-                            listOf("TSO", "CMS", "CICS").forEach { ht ->
-                                FilterChip(
-                                    selected = (hostType == ht),
-                                    onClick = { hostType = ht },
-                                    label = { Text(ht, fontSize = 11.sp) }
-                                )
+                        Column(modifier = Modifier.fillMaxWidth()) {
+                            Text("Host System Type:", fontSize = 11.sp, color = Color.Gray)
+                            Spacer(modifier = Modifier.height(4.dp))
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.spacedBy(6.dp)
+                            ) {
+                                listOf("TSO", "CMS", "CICS").forEach { ht ->
+                                    val isSelected = (hostType == ht)
+                                    Surface(
+                                        shape = RoundedCornerShape(6.dp),
+                                        color = if (isSelected) Color(0xFF1C7ED6) else Color(0xFF2C2D30),
+                                        modifier = Modifier
+                                            .weight(1f)
+                                            .height(34.dp)
+                                            .clickable { hostType = ht }
+                                    ) {
+                                        Box(
+                                            contentAlignment = Alignment.Center,
+                                            modifier = Modifier.fillMaxSize()
+                                        ) {
+                                            Text(
+                                                text = ht,
+                                                color = Color.White,
+                                                fontSize = 11.sp,
+                                                fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal
+                                            )
+                                        }
+                                    }
+                                }
+                            }
+                        }
+
+                        // Graphics Mode (Both, Vector, Symbols, Off)
+                        Column(modifier = Modifier.fillMaxWidth()) {
+                            Text("Graphics Mode:", fontSize = 11.sp, color = Color.Gray)
+                            Spacer(modifier = Modifier.height(4.dp))
+                            Row(
+                                modifier = Modifier.fillMaxWidth(),
+                                horizontalArrangement = Arrangement.spacedBy(6.dp)
+                            ) {
+                                listOf(
+                                    "BOTH" to "Both",
+                                    "VECTOR_GRAPHICS" to "Vector",
+                                    "PROGRAMMED_SYMBOLS" to "Symbols",
+                                    "NONE" to "Off"
+                                ).forEach { (modeKey, modeLabel) ->
+                                    val isSelected = graphicsMode.equals(modeKey, ignoreCase = true)
+                                    Surface(
+                                        shape = RoundedCornerShape(6.dp),
+                                        color = if (isSelected) Color(0xFF2B8A3E) else Color(0xFF2C2D30),
+                                        modifier = Modifier
+                                            .weight(1f)
+                                            .height(34.dp)
+                                            .clickable { graphicsMode = modeKey }
+                                    ) {
+                                        Box(
+                                            contentAlignment = Alignment.Center,
+                                            modifier = Modifier.fillMaxSize().padding(horizontal = 2.dp)
+                                        ) {
+                                            Text(
+                                                text = modeLabel,
+                                                color = Color.White,
+                                                fontSize = 11.sp,
+                                                fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+                                                textAlign = TextAlign.Center
+                                            )
+                                        }
+                                    }
+                                }
                             }
                         }
 
                         OutlinedTextField(
                             value = luName,
                             onValueChange = { luName = it },
-                            label = { Text("LU Name (Optional)") },
+                            label = { Text("LU Name / Device Pool (Optional)") },
                             singleLine = true,
                             modifier = Modifier.fillMaxWidth()
                         )
 
-                        Row(
-                            verticalAlignment = Alignment.CenterVertically,
-                            modifier = Modifier
-                                .fillMaxWidth()
-                                .clickable { autoConnect = !autoConnect }
+                        // Protocol & Security Options
+                        Column(
+                            modifier = Modifier.fillMaxWidth(),
+                            verticalArrangement = Arrangement.spacedBy(2.dp)
                         ) {
-                            Checkbox(
-                                checked = autoConnect,
-                                onCheckedChange = { autoConnect = it }
-                            )
-                            Spacer(modifier = Modifier.width(4.dp))
-                            Text("Auto-connect on app startup", fontSize = 12.sp)
+                            // TLS / SSL Checkbox
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .clickable {
+                                        val newTls = !useTls
+                                        useTls = newTls
+                                        if (newTls && portStr.trim() == "23") {
+                                            portStr = "992"
+                                        } else if (!newTls && portStr.trim() == "992") {
+                                            portStr = "23"
+                                        }
+                                    }
+                            ) {
+                                Checkbox(
+                                    checked = useTls,
+                                    onCheckedChange = { checked ->
+                                        useTls = checked
+                                        if (checked && portStr.trim() == "23") {
+                                            portStr = "992"
+                                        } else if (!checked && portStr.trim() == "992") {
+                                            portStr = "23"
+                                        }
+                                    }
+                                )
+                                Spacer(modifier = Modifier.width(4.dp))
+                                Text("Enable TLS / SSL Connection", fontSize = 12.sp, color = Color.White)
+                            }
+
+                            // Verify Certificate Checkbox (only when TLS is active)
+                            if (useTls) {
+                                Row(
+                                    verticalAlignment = Alignment.CenterVertically,
+                                    modifier = Modifier
+                                        .fillMaxWidth()
+                                        .padding(start = 24.dp)
+                                        .clickable { tlsVerifyCert = !tlsVerifyCert }
+                                ) {
+                                    Checkbox(
+                                        checked = tlsVerifyCert,
+                                        onCheckedChange = { tlsVerifyCert = it }
+                                    )
+                                    Spacer(modifier = Modifier.width(4.dp))
+                                    Text(
+                                        "Verify Server Certificate",
+                                        fontSize = 12.sp,
+                                        color = if (tlsVerifyCert) Color.LightGray else Color(0xFFFFB450)
+                                    )
+                                }
+                            }
+
+                            // TN3270E Checkbox
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .clickable { tn3270e = !tn3270e }
+                            ) {
+                                Checkbox(
+                                    checked = tn3270e,
+                                    onCheckedChange = { tn3270e = it }
+                                )
+                                Spacer(modifier = Modifier.width(4.dp))
+                                Text("Enable TN3270E (Extended 3270)", fontSize = 12.sp, color = Color.White)
+                            }
+
+                            // Auto-connect Checkbox
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .clickable { autoConnect = !autoConnect }
+                            ) {
+                                Checkbox(
+                                    checked = autoConnect,
+                                    onCheckedChange = { autoConnect = it }
+                                )
+                                Spacer(modifier = Modifier.width(4.dp))
+                                Text("Auto-connect on app startup", fontSize = 12.sp, color = Color.White)
+                            }
                         }
                     }
                 }
@@ -298,22 +519,33 @@ fun ConnectDialog(
                     verticalAlignment = Alignment.CenterVertically
                 ) {
                     TextButton(onClick = onDismiss) {
-                        Text("Cancel")
+                        Text("Cancel", color = Color.LightGray)
                     }
-                    Spacer(modifier = Modifier.width(4.dp))
+                    Spacer(modifier = Modifier.width(6.dp))
                     OutlinedButton(onClick = { saveCurrentProfile() }) {
                         Text("Save")
                     }
-                    Spacer(modifier = Modifier.width(4.dp))
+                    Spacer(modifier = Modifier.width(6.dp))
                     Button(
                         onClick = {
                             val saved = saveCurrentProfile()
                             if (saved != null) {
-                                onConnect(saved.host, saved.port, saved.model, saved.luName, saved.hostType)
+                                onConnect(
+                                    saved.host,
+                                    saved.port,
+                                    saved.model,
+                                    saved.luName,
+                                    saved.hostType,
+                                    saved.useTls,
+                                    saved.tlsVerifyCert,
+                                    saved.tn3270e,
+                                    saved.graphicsMode
+                                )
                             }
-                        }
+                        },
+                        colors = ButtonDefaults.buttonColors(containerColor = Color(0xFF2B8A3E))
                     ) {
-                        Text("Connect")
+                        Text("Connect", color = Color.White, fontWeight = FontWeight.Bold)
                     }
                 }
             }

src/main/java/org/pubvm/a3270/ui/FunctionKeyBar.kt

@@ -1,20 +1,20 @@
 package org.pubvm.a3270.ui
 
+import android.view.HapticFeedbackConstants
 import androidx.compose.foundation.background
-import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.*
-import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.focusProperties
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalView
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
-import androidx.compose.ui.focus.focusProperties
 import org.lib3270j.ConnectionState
 import org.lib3270j.protocol.DS3270Constants.*
 
@@ -22,6 +22,7 @@ import org.lib3270j.protocol.DS3270Constants.*
 fun TwoRowKeyBar(
     connectionState: ConnectionState,
     isShiftPressed: Boolean = false,
+    hapticFeedbackEnabled: Boolean = true,
     onClearShift: () -> Unit = {},
     onConnectClick: () -> Unit,
     onDisconnectClick: () -> Unit,
@@ -58,6 +59,7 @@ fun TwoRowKeyBar(
                     label = "⋮",
                     color = Color(0xFF343A40),
                     modifier = Modifier.fillMaxWidth(),
+                    hapticFeedbackEnabled = hapticFeedbackEnabled,
                     innerPaddingHorizontal = 0.dp,
                     onClick = { menuExpanded = true }
                 )
@@ -106,6 +108,7 @@ fun TwoRowKeyBar(
                 label = tabLabel,
                 color = Color(0xFF1C7ED6),
                 modifier = Modifier.weight(1f),
+                hapticFeedbackEnabled = hapticFeedbackEnabled,
                 innerPaddingHorizontal = 0.dp,
                 onClick = {
                     if (isShiftPressed) {
@@ -118,34 +121,34 @@ fun TwoRowKeyBar(
             )
 
             // 3. RESET
-            KeyButton("RESET", Color(0xFFE67700), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onReset)
+            KeyButton("RESET", Color(0xFFE67700), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = onReset)
 
             // 4. ENTER
-            KeyButton("ENTER", Color(0xFF2B8A3E), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_ENTER) })
+            KeyButton("ENTER", Color(0xFF2B8A3E), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_ENTER) })
 
             // 5. CLEAR
-            KeyButton("CLEAR", Color(0xFFC92A2A), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_CLEAR) })
+            KeyButton("CLEAR", Color(0xFFC92A2A), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_CLEAR) })
 
             // 6. PA1
-            KeyButton("PA1", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA1) })
+            KeyButton("PA1", Color(0xFF495057), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA1) })
 
             // 7. PA2
-            KeyButton("PA2", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA2) })
+            KeyButton("PA2", Color(0xFF495057), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA2) })
 
             // 8. PA3
-            KeyButton("PA3", Color(0xFF495057), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA3) })
+            KeyButton("PA3", Color(0xFF495057), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = { onSendAid(AID_PA3) })
 
             // 9. Left Navigation
-            KeyButton("←", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorLeft)
+            KeyButton("←", Color(0xFF343A40), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = onCursorLeft)
 
             // 10. Up Navigation
-            KeyButton("↑", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorUp)
+            KeyButton("↑", Color(0xFF343A40), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = onCursorUp)
 
             // 11. Down Navigation
-            KeyButton("↓", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorDown)
+            KeyButton("↓", Color(0xFF343A40), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = onCursorDown)
 
             // 12. Right Navigation
-            KeyButton("→", Color(0xFF343A40), modifier = Modifier.weight(1f), innerPaddingHorizontal = 0.dp, onClick = onCursorRight)
+            KeyButton("→", Color(0xFF343A40), modifier = Modifier.weight(1f), hapticFeedbackEnabled = hapticFeedbackEnabled, innerPaddingHorizontal = 0.dp, onClick = onCursorRight)
         }
 
         Spacer(modifier = Modifier.height(1.dp).fillMaxWidth().background(Color(0xFF2C2D30)))
@@ -174,6 +177,7 @@ fun TwoRowKeyBar(
                     label = "F$i",
                     color = Color(0xFF364FC7),
                     modifier = Modifier.weight(1f),
+                    hapticFeedbackEnabled = hapticFeedbackEnabled,
                     innerPaddingHorizontal = 0.dp,
                     onClick = {
                         onSendAid(aid)
@@ -193,10 +197,17 @@ private fun KeyButton(
     color: Color,
     onClick: () -> Unit,
     modifier: Modifier = Modifier,
+    hapticFeedbackEnabled: Boolean = true,
     innerPaddingHorizontal: androidx.compose.ui.unit.Dp = 0.dp
 ) {
+    val view = LocalView.current
     Surface(
-        onClick = onClick,
+        onClick = {
+            if (hapticFeedbackEnabled) {
+                view.performHapticFeedback(HapticFeedbackConstants.KEYBOARD_TAP)
+            }
+            onClick()
+        },
         shape = RoundedCornerShape(4.dp),
         color = color,
         shadowElevation = 1.dp,

src/main/java/org/pubvm/a3270/ui/OiaStatusBar.kt

@@ -24,6 +24,9 @@ fun OiaStatusBar(
     cursorAddr: Int,
     rows: Int,
     cols: Int,
+    isTls: Boolean = false,
+    isTlsVerified: Boolean = true,
+    graphicsMode: String = "NONE",
     modifier: Modifier = Modifier
 ) {
     val row = if (cols > 0) (cursorAddr / cols) + 1 else 1
@@ -76,6 +79,46 @@ fun OiaStatusBar(
                 fontWeight = FontWeight.Bold,
                 maxLines = 1
             )
+
+            // TLS Badge
+            if (connectionState.isConnected() && isTls) {
+                Spacer(modifier = Modifier.width(6.dp))
+                Surface(
+                    color = if (isTlsVerified) Color(0xFF51CF66).copy(alpha = 0.2f) else Color(0xFFFFB450).copy(alpha = 0.2f),
+                    shape = RoundedCornerShape(4.dp)
+                ) {
+                    Text(
+                        text = if (isTlsVerified) "🔒 TLS" else "🔓 TLS",
+                        color = if (isTlsVerified) Color(0xFF51CF66) else Color(0xFFFFB450),
+                        fontSize = 9.sp,
+                        fontFamily = FontFamily.Monospace,
+                        fontWeight = FontWeight.Bold,
+                        modifier = Modifier.padding(horizontal = 4.dp, vertical = 1.dp)
+                    )
+                }
+            }
+
+            // GFX Mode Badge
+            if (connectionState.isConnected() && graphicsMode != "NONE" && graphicsMode.isNotBlank()) {
+                Spacer(modifier = Modifier.width(6.dp))
+                Surface(
+                    color = Color(0xFF22B8CF).copy(alpha = 0.2f),
+                    shape = RoundedCornerShape(4.dp)
+                ) {
+                    Text(
+                        text = when (graphicsMode) {
+                            "VECTOR_GRAPHICS" -> "GOCA"
+                            "PROGRAMMED_SYMBOLS" -> "PS"
+                            else -> "GFX"
+                        },
+                        color = Color(0xFF22B8CF),
+                        fontSize = 9.sp,
+                        fontFamily = FontFamily.Monospace,
+                        fontWeight = FontWeight.Bold,
+                        modifier = Modifier.padding(horizontal = 4.dp, vertical = 1.dp)
+                    )
+                }
+            }
         }
 
         // Terminal Keyboard Lock Status Badge (X SYSTEM vs READY)

src/main/java/org/pubvm/a3270/ui/SettingsDialog.kt

@@ -1,7 +1,10 @@
 package org.pubvm.a3270.ui
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
@@ -12,27 +15,40 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
 
+import androidx.compose.ui.window.DialogProperties
+
 @Composable
 fun SettingsDialog(
     initialMaskHiddenInput: Boolean,
     initialCursorBlink: Boolean,
+    initialHapticFeedback: Boolean = true,
+    initialVerifyCerts: Boolean = true,
+    initialDefaultGraphicsMode: String = "BOTH",
     onDismiss: () -> Unit,
-    onSave: (maskHiddenInput: Boolean, cursorBlink: Boolean) -> Unit
+    onSave: (maskHiddenInput: Boolean, cursorBlink: Boolean, hapticFeedback: Boolean, verifyCerts: Boolean, defaultGraphicsMode: String) -> Unit
 ) {
     var maskHiddenInput by remember { mutableStateOf(initialMaskHiddenInput) }
     var cursorBlink by remember { mutableStateOf(initialCursorBlink) }
+    var hapticFeedback by remember { mutableStateOf(initialHapticFeedback) }
+    var verifyCerts by remember { mutableStateOf(initialVerifyCerts) }
+    var defaultGraphicsMode by remember { mutableStateOf(initialDefaultGraphicsMode) }
 
-    Dialog(onDismissRequest = onDismiss) {
+    Dialog(
+        onDismissRequest = onDismiss,
+        properties = DialogProperties(usePlatformDefaultWidth = false)
+    ) {
         Card(
-            shape = RoundedCornerShape(12.dp),
+            shape = RoundedCornerShape(16.dp),
             colors = CardDefaults.cardColors(containerColor = Color(0xFF1E1E1E)),
             modifier = Modifier
-                .fillMaxWidth()
-                .padding(16.dp)
+                .fillMaxWidth(0.95f)
+                .heightIn(max = 680.dp)
+                .padding(vertical = 16.dp)
         ) {
             Column(
                 modifier = Modifier
                     .fillMaxWidth()
+                    .verticalScroll(rememberScrollState())
                     .padding(20.dp)
             ) {
                 Text(
@@ -106,6 +122,126 @@ fun SettingsDialog(
                     )
                 }
 
+                Spacer(modifier = Modifier.height(16.dp))
+                HorizontalDivider(color = Color(0xFF2C2D30))
+                Spacer(modifier = Modifier.height(16.dp))
+
+                // Setting 3: Button Haptic Feedback
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    Column(modifier = Modifier.weight(1f).padding(end = 12.dp)) {
+                        Text(
+                            text = "Button Haptic Feedback",
+                            fontSize = 14.sp,
+                            fontWeight = FontWeight.SemiBold,
+                            color = Color.White
+                        )
+                        Text(
+                            text = "Vibrate softly when tapping function and navigation buttons to match keyboard tactile feedback.",
+                            fontSize = 12.sp,
+                            color = Color.LightGray
+                        )
+                    }
+                    Switch(
+                        checked = hapticFeedback,
+                        onCheckedChange = { hapticFeedback = it },
+                        colors = SwitchDefaults.colors(
+                            checkedThumbColor = Color.White,
+                            checkedTrackColor = Color(0xFF2B8A3E)
+                        )
+                    )
+                }
+
+                Spacer(modifier = Modifier.height(16.dp))
+                HorizontalDivider(color = Color(0xFF2C2D30))
+                Spacer(modifier = Modifier.height(16.dp))
+
+                // Setting 4: Overall TLS Certificate Verification
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    Column(modifier = Modifier.weight(1f).padding(end = 12.dp)) {
+                        Text(
+                            text = "Verify TLS Certificates",
+                            fontSize = 14.sp,
+                            fontWeight = FontWeight.SemiBold,
+                            color = Color.White
+                        )
+                        Text(
+                            text = "Enforce SSL/TLS certificate validation. Turn off to allow self-signed or unverified certificates without security prompts.",
+                            fontSize = 12.sp,
+                            color = Color.LightGray
+                        )
+                    }
+                    Switch(
+                        checked = verifyCerts,
+                        onCheckedChange = { verifyCerts = it },
+                        colors = SwitchDefaults.colors(
+                            checkedThumbColor = Color.White,
+                            checkedTrackColor = Color(0xFF2B8A3E)
+                        )
+                    )
+                }
+
+                Spacer(modifier = Modifier.height(16.dp))
+                HorizontalDivider(color = Color(0xFF2C2D30))
+                Spacer(modifier = Modifier.height(16.dp))
+
+                // Setting 5: Default Graphics Support Mode
+                Column(modifier = Modifier.fillMaxWidth()) {
+                    Text(
+                        text = "Default Graphics Mode",
+                        fontSize = 14.sp,
+                        fontWeight = FontWeight.SemiBold,
+                        color = Color.White
+                    )
+                    Text(
+                        text = "Configure default vector graphics (GOCA) and Programmed Symbols (APL) mode.",
+                        fontSize = 12.sp,
+                        color = Color.LightGray
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                    Row(
+                        modifier = Modifier.fillMaxWidth(),
+                        horizontalArrangement = Arrangement.spacedBy(6.dp)
+                    ) {
+                        listOf(
+                            "BOTH" to "Both",
+                            "VECTOR_GRAPHICS" to "Vector",
+                            "PROGRAMMED_SYMBOLS" to "Symbols",
+                            "NONE" to "Off"
+                        ).forEach { (modeKey, modeLabel) ->
+                            val isSelected = defaultGraphicsMode.equals(modeKey, ignoreCase = true)
+                            Surface(
+                                shape = RoundedCornerShape(6.dp),
+                                color = if (isSelected) Color(0xFF2B8A3E) else Color(0xFF2C2D30),
+                                modifier = Modifier
+                                    .weight(1f)
+                                    .height(34.dp)
+                                    .clickable { defaultGraphicsMode = modeKey }
+                            ) {
+                                Box(
+                                    contentAlignment = Alignment.Center,
+                                    modifier = Modifier.fillMaxSize().padding(horizontal = 2.dp)
+                                ) {
+                                    Text(
+                                        text = modeLabel,
+                                        color = Color.White,
+                                        fontSize = 11.sp,
+                                        fontWeight = if (isSelected) FontWeight.Bold else FontWeight.Normal,
+                                        textAlign = androidx.compose.ui.text.style.TextAlign.Center
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+
                 Spacer(modifier = Modifier.height(24.dp))
 
                 // Action Buttons
@@ -119,7 +255,7 @@ fun SettingsDialog(
                     Spacer(modifier = Modifier.width(8.dp))
                     Button(
                         onClick = {
-                            onSave(maskHiddenInput, cursorBlink)
+                            onSave(maskHiddenInput, cursorBlink, hapticFeedback, verifyCerts, defaultGraphicsMode)
                         },
                         colors = ButtonDefaults.buttonColors(containerColor = Color(0xFF2B8A3E))
                     ) {

src/main/java/org/pubvm/a3270/ui/TerminalView.kt

@@ -58,6 +58,8 @@ fun TerminalView(
     cols: Int,
     cursorAddr: Int,
     screenVersion: Long,
+    programSymbolManager: org.lib3270j.graphics.ProgramSymbolManager? = null,
+    graphicsPlane: org.lib3270j.graphics.GraphicsPlane? = null,
     maskHiddenFields: Boolean = true,
     blinkCursor: Boolean = true,
     onTapAddress: (Int) -> Unit,
@@ -68,6 +70,9 @@ fun TerminalView(
     val clipboardManager = LocalClipboardManager.current
     val density = LocalDensity.current
 
+    val currentScreenVersion by rememberUpdatedState(screenVersion)
+    val currentCursorAddr by rememberUpdatedState(cursorAddr)
+
     var selectionStart by remember { mutableStateOf<Offset?>(null) }
     var selectionEnd by remember { mutableStateOf<Offset?>(null) }
     var showContextMenu by remember { mutableStateOf(false) }
@@ -137,11 +142,10 @@ fun TerminalView(
                                 showContextMenu = false
                                 selectionStart = null
                                 selectionEnd = null
-                                val cellWidth = size.width / cols
-                                val cellHeight = size.height / rows
-                                if (cellWidth > 0 && cellHeight > 0) {
-                                    val col = (startPos.x / cellWidth).toInt().coerceIn(0, cols - 1)
-                                    val row = (startPos.y / cellHeight).toInt().coerceIn(0, rows - 1)
+                                val metrics = calculateGridMetrics(size.width.toFloat(), size.height.toFloat(), cols, rows)
+                                if (metrics.cellWidth > 0 && metrics.cellHeight > 0) {
+                                    val col = ((startPos.x - metrics.offsetX) / metrics.cellWidth).toInt().coerceIn(0, cols - 1)
+                                    val row = ((startPos.y - metrics.offsetY) / metrics.cellHeight).toInt().coerceIn(0, rows - 1)
                                     var addr = row * cols + col
 
                                     val buf = screenBuffer
@@ -158,17 +162,30 @@ fun TerminalView(
                     }
                 }
         ) {
-            val width = size.width
-            val height = size.height
-            val cellWidth = width / cols
-            val cellHeight = height / rows
+            val version = currentScreenVersion
+            val activeCursorAddr = currentCursorAddr
+            if (version == -1L) return@Canvas
 
-            if (cellWidth <= 0 || cellHeight <= 0) return@Canvas
+            val metrics = calculateGridMetrics(size.width, size.height, cols, rows)
+            if (metrics.cellWidth <= 0f || metrics.cellHeight <= 0f) return@Canvas
+
+            val cellWidth = metrics.cellWidth
+            val cellHeight = metrics.cellHeight
+            val offsetX = metrics.offsetX
+            val offsetY = metrics.offsetY
 
             val paint = Paint().apply {
                 isAntiAlias = true
                 typeface = Typeface.MONOSPACE
-                textSize = cellHeight * 0.85f
+                textAlign = Paint.Align.CENTER
+            }
+
+            // Calculate optimal font size ensuring characters fit cleanly in cell without crowding
+            val baseTextSize = cellHeight * 0.78f
+            paint.textSize = baseTextSize
+            val measuredW = paint.measureText("W")
+            if (measuredW > cellWidth * 0.85f && measuredW > 0f) {
+                paint.textSize = baseTextSize * (cellWidth * 0.85f / measuredW)
             }
 
             val buf = screenBuffer
@@ -185,11 +202,11 @@ fun TerminalView(
 
             val start = selectionStart
             val end = selectionEnd
-            if (start != null && end != null) {
-                val startCol = (start.x / cellWidth).toInt().coerceIn(0, cols - 1)
-                val startRow = (start.y / cellHeight).toInt().coerceIn(0, rows - 1)
-                val endCol = (end.x / cellWidth).toInt().coerceIn(0, cols - 1)
-                val endRow = (end.y / cellHeight).toInt().coerceIn(0, rows - 1)
+            if (start != null && end != null && cellWidth > 0f && cellHeight > 0f) {
+                val startCol = ((start.x - offsetX) / cellWidth).toInt().coerceIn(0, cols - 1)
+                val startRow = ((start.y - offsetY) / cellHeight).toInt().coerceIn(0, rows - 1)
+                val endCol = ((end.x - offsetX) / cellWidth).toInt().coerceIn(0, cols - 1)
+                val endRow = ((end.y - offsetY) / cellHeight).toInt().coerceIn(0, rows - 1)
 
                 selMinRow = minOf(startRow, endRow)
                 selMaxRow = maxOf(startRow, endRow)
@@ -202,8 +219,8 @@ fun TerminalView(
                     val addr = r * cols + c
                     if (addr >= totalCells) break
 
-                    val left = c * cellWidth
-                    val top = r * cellHeight
+                    val left = offsetX + c * cellWidth
+                    val top = offsetY + r * cellHeight
 
                     var charVal = ' '
                     var fgColor: Color
@@ -211,6 +228,8 @@ fun TerminalView(
                     var isBold = false
                     var isUnderline = false
                     var isReverse = false
+                    var csVal = 0
+                    var ecVal = 0
 
                     if (buf != null) {
                         val ea = buf.getCell(addr)
@@ -225,6 +244,10 @@ fun TerminalView(
                         fgColor = getFgColorForAttribute(ea, currentFieldEa, currentFA)
                         bgColor = getBgColorForAttribute(ea, currentFieldEa)
 
+                        csVal = if (ea.cs != 0.toByte()) (ea.cs.toInt() and 0xFF)
+                                else (currentFieldEa?.cs?.toInt()?.and(0xFF) ?: 0)
+                        ecVal = ea.ec.toInt() and 0xFF
+
                         // Intensity
                         if (faIsHigh(currentFA.toInt() and 0xFF)) {
                             isBold = true
@@ -271,7 +294,7 @@ fun TerminalView(
                         )
                     }
 
-                    // Highlight selected block range
+                    // Draw selection box highlight if selected
                     val isSelected = r in selMinRow..selMaxRow && c in selMinCol..selMaxCol
                     if (isSelected) {
                         drawRect(
@@ -282,7 +305,7 @@ fun TerminalView(
                     }
 
                     // Cursor indicator (respects blinking toggle & timer)
-                    if (addr == cursorAddr && !isSelected && cursorVisible) {
+                    if (addr == activeCursorAddr && !isSelected && cursorVisible) {
                         drawRect(
                             color = HOST_COLORS[HOST_COLOR_TURQUOISE].copy(alpha = 0.5f),
                             topLeft = Offset(left, top),
@@ -290,15 +313,37 @@ fun TerminalView(
                         )
                     }
 
-                    if (charVal != ' ') {
+                    // Draw Programmed Symbol (PS / APL) if defined
+                    var drawnAsPs = false
+                    if (csVal >= 0x40 && programSymbolManager != null) {
+                        val slot = programSymbolManager.getSymbol(csVal, ecVal)
+                        if (slot != null) {
+                            val symWidth = slot.width
+                            val symHeight = slot.height
+                            val rgbArray = slot.getRgbPixels(fgColor.toArgb(), bgColor.toArgb())
+                            if (rgbArray != null && symWidth > 0 && symHeight > 0) {
+                                val bmp = android.graphics.Bitmap.createBitmap(rgbArray as IntArray, symWidth, symHeight, android.graphics.Bitmap.Config.ARGB_8888)
+                                drawContext.canvas.nativeCanvas.drawBitmap(
+                                    bmp,
+                                    null,
+                                    android.graphics.RectF(left, top, left + cellWidth, top + cellHeight),
+                                    null
+                                )
+                                drawnAsPs = true
+                            }
+                        }
+                    }
+
+                    if (!drawnAsPs && charVal != ' ') {
                         paint.color = fgColor.toArgb()
                         paint.isFakeBoldText = isBold
                         val fontMetrics = paint.fontMetrics
-                        val textY = top + (cellHeight - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top
+                        val textX = left + cellWidth / 2f
+                        val textY = top + (cellHeight - fontMetrics.bottom + fontMetrics.top) / 2f - fontMetrics.top
 
                         drawContext.canvas.nativeCanvas.drawText(
                             charVal.toString(),
-                            left + (cellWidth / 4),
+                            textX,
                             textY,
                             paint
                         )
@@ -307,13 +352,32 @@ fun TerminalView(
                     if (isUnderline) {
                         drawLine(
                             color = fgColor,
-                            start = Offset(left, top + cellHeight - 2),
-                            end = Offset(left + cellWidth, top + cellHeight - 2),
+                            start = Offset(left, top + cellHeight - 2f),
+                            end = Offset(left + cellWidth, top + cellHeight - 2f),
                             strokeWidth = 2f
                         )
                     }
                 }
             }
+
+            // Draw Vector Graphics Plane overlay if present
+            if (graphicsPlane != null && graphicsPlane.hasContent()) {
+                val gridW = metrics.gridWidth.toInt()
+                val gridH = metrics.gridHeight.toInt()
+                if (gridW > 0 && gridH > 0) {
+                    graphicsPlane.resize(gridW, gridH)
+                    val rgb = graphicsPlane.rgbBuffer
+                    if (rgb != null) {
+                        val bmp = android.graphics.Bitmap.createBitmap(rgb, gridW, gridH, android.graphics.Bitmap.Config.ARGB_8888)
+                        drawContext.canvas.nativeCanvas.drawBitmap(
+                            bmp,
+                            null,
+                            android.graphics.RectF(offsetX, offsetY, offsetX + gridW.toFloat(), offsetY + gridH.toFloat()),
+                            null
+                        )
+                    }
+                }
+            }
         }
 
         // Context Menu Popup
@@ -370,6 +434,57 @@ fun TerminalView(
     }
 }
 
+data class TerminalGridMetrics(
+    val cellWidth: Float,
+    val cellHeight: Float,
+    val gridWidth: Float,
+    val gridHeight: Float,
+    val offsetX: Float,
+    val offsetY: Float
+)
+
+fun calculateGridMetrics(
+    viewWidth: Float,
+    viewHeight: Float,
+    cols: Int,
+    rows: Int
+): TerminalGridMetrics {
+    if (viewWidth <= 0f || viewHeight <= 0f || cols <= 0 || rows <= 0) {
+        return TerminalGridMetrics(0f, 0f, 0f, 0f, 0f, 0f)
+    }
+
+    val rawCellW = viewWidth / cols
+    val rawCellH = viewHeight / rows
+    val currentRatio = rawCellW / rawCellH
+
+    // Target terminal cell aspect ratio is roughly 0.50 to 0.60 (width / height)
+    val targetMinRatio = 0.48f
+    val targetMaxRatio = 0.60f
+
+    val cellW: Float
+    val cellH: Float
+
+    if (currentRatio > targetMaxRatio) {
+        // Screen is wider than ideal aspect ratio -> clamp width, pillarbox (equal blank bars left/right)
+        cellH = rawCellH
+        cellW = rawCellH * targetMaxRatio
+    } else if (currentRatio < targetMinRatio) {
+        // Screen is taller than ideal aspect ratio -> clamp height, letterbox (equal blank bars top/bottom)
+        cellW = rawCellW
+        cellH = rawCellW / targetMinRatio
+    } else {
+        cellW = rawCellW
+        cellH = rawCellH
+    }
+
+    val gridW = cols * cellW
+    val gridH = rows * cellH
+    val offX = (viewWidth - gridW) / 2f
+    val offY = (viewHeight - gridH) / 2f
+
+    return TerminalGridMetrics(cellW, cellH, gridW, gridH, offX, offY)
+}
+
 private fun copySelection(
     start: Offset?,
     end: Offset?,
@@ -381,13 +496,15 @@ private fun copySelection(
 ) {
     if (start != null && end != null && screenBuffer != null && cols > 0 && rows > 0) {
         val displayMetrics = context.resources.displayMetrics
-        val cellWidth = displayMetrics.widthPixels.toFloat() / cols
-        val cellHeight = displayMetrics.heightPixels.toFloat() / rows
+        val viewW = displayMetrics.widthPixels.toFloat()
+        val viewH = displayMetrics.heightPixels.toFloat()
+        val metrics = calculateGridMetrics(viewW, viewH, cols, rows)
+        if (metrics.cellWidth <= 0f || metrics.cellHeight <= 0f) return
 
-        val startCol = (start.x / cellWidth).toInt().coerceIn(0, cols - 1)
-        val startRow = (start.y / cellHeight).toInt().coerceIn(0, rows - 1)
-        val endCol = (end.x / cellWidth).toInt().coerceIn(0, cols - 1)
-        val endRow = (end.y / cellHeight).toInt().coerceIn(0, rows - 1)
+        val startCol = ((start.x - metrics.offsetX) / metrics.cellWidth).toInt().coerceIn(0, cols - 1)
+        val startRow = ((start.y - metrics.offsetY) / metrics.cellHeight).toInt().coerceIn(0, rows - 1)
+        val endCol = ((end.x - metrics.offsetX) / metrics.cellWidth).toInt().coerceIn(0, cols - 1)
+        val endRow = ((end.y - metrics.offsetY) / metrics.cellHeight).toInt().coerceIn(0, rows - 1)
 
         val minRow = minOf(startRow, endRow)
         val maxRow = maxOf(startRow, endRow)

src/main/java/org/pubvm/a3270/ui/UntrustedCertificateDialog.kt

@@ -0,0 +1,192 @@
+package org.pubvm.a3270.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.*
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.window.Dialog
+import androidx.compose.ui.window.DialogProperties
+import java.security.MessageDigest
+import java.security.cert.CertificateException
+import java.security.cert.X509Certificate
+import java.text.SimpleDateFormat
+import java.util.Locale
+
+@Composable
+fun UntrustedCertificateDialog(
+    host: String,
+    port: Int,
+    chain: Array<X509Certificate>?,
+    exception: CertificateException?,
+    onAccept: () -> Unit,
+    onReject: () -> Unit
+) {
+    val cert = chain?.firstOrNull()
+    val sdf = SimpleDateFormat("yyyy-MM-dd HH:mm:ss z", Locale.US)
+
+    val detailsText = buildString {
+        if (exception != null) {
+            append("Validation Error:\n  ")
+            append(exception.localizedMessage ?: exception.message ?: exception.toString())
+            append("\n\n")
+        }
+        if (cert != null) {
+            try {
+                append("Subject:\n  ")
+                append(cert.subjectX500Principal?.name ?: cert.subjectDN?.name ?: "Unknown")
+                append("\n\n")
+            } catch (t: Throwable) {
+                append("Subject: ${t.message ?: "Unavailable"}\n\n")
+            }
+
+            try {
+                append("Issuer:\n  ")
+                append(cert.issuerX500Principal?.name ?: cert.issuerDN?.name ?: "Unknown")
+                append("\n\n")
+            } catch (t: Throwable) {
+                append("Issuer: ${t.message ?: "Unavailable"}\n\n")
+            }
+
+            try {
+                append("Validity:\n  From: ")
+                append(cert.notBefore?.let { sdf.format(it) } ?: "Unknown")
+                append("\n  To:   ")
+                append(cert.notAfter?.let { sdf.format(it) } ?: "Unknown")
+                append("\n\n")
+            } catch (t: Throwable) {
+                append("Validity: ${t.message ?: "Unavailable"}\n\n")
+            }
+
+            try {
+                append("Serial Number:\n  ")
+                append(cert.serialNumber?.toString(16)?.uppercase(Locale.US) ?: "Unknown")
+                append("\n\n")
+            } catch (t: Throwable) {
+                append("Serial Number: ${t.message ?: "Unavailable"}\n\n")
+            }
+
+            try {
+                append("SHA-256 Fingerprint:\n  ")
+                append(computeFingerprint(cert, "SHA-256"))
+                append("\n\n")
+            } catch (t: Throwable) {
+                append("SHA-256 Fingerprint: ${t.message ?: "Unavailable"}\n\n")
+            }
+
+            try {
+                append("SHA-1 Fingerprint:\n  ")
+                append(computeFingerprint(cert, "SHA-1"))
+            } catch (t: Throwable) {
+                append("SHA-1 Fingerprint: ${t.message ?: "Unavailable"}")
+            }
+        } else {
+            append("No peer certificate information available.")
+        }
+    }
+
+    Dialog(
+        onDismissRequest = onReject,
+        properties = DialogProperties(dismissOnBackPress = true, dismissOnClickOutside = false)
+    ) {
+        Surface(
+            shape = RoundedCornerShape(12.dp),
+            color = Color(0xFF1E1E1E),
+            tonalElevation = 6.dp,
+            modifier = Modifier
+                .fillMaxWidth(0.96f)
+                .wrapContentHeight()
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp),
+                verticalArrangement = Arrangement.spacedBy(10.dp)
+            ) {
+                // Header
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(10.dp)
+                ) {
+                    Text(
+                        text = "⚠️",
+                        fontSize = 24.sp
+                    )
+                    Column {
+                        Text(
+                            text = "Untrusted SSL/TLS Certificate",
+                            fontSize = 16.sp,
+                            fontWeight = FontWeight.Bold,
+                            color = Color(0xFFFFB450)
+                        )
+                        Text(
+                            text = "The server certificate for $host:$port could not be verified.",
+                            fontSize = 12.sp,
+                            color = Color.LightGray
+                        )
+                    }
+                }
+
+                // Scrollable Certificate Details Box
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .heightIn(max = 280.dp)
+                        .background(Color(0xFF121212), RoundedCornerShape(6.dp))
+                        .border(1.dp, Color(0xFF333333), RoundedCornerShape(6.dp))
+                        .padding(10.dp)
+                ) {
+                    val scrollState = rememberScrollState()
+                    Text(
+                        text = detailsText,
+                        color = Color(0xFFDCDCDC),
+                        fontSize = 11.sp,
+                        fontFamily = FontFamily.Monospace,
+                        lineHeight = 15.sp,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .verticalScroll(scrollState)
+                    )
+                }
+
+                // Action Buttons
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.End,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    TextButton(onClick = onReject) {
+                        Text("Cancel Connection", color = Color.LightGray)
+                    }
+                    Spacer(modifier = Modifier.width(8.dp))
+                    Button(
+                        onClick = onAccept,
+                        colors = ButtonDefaults.buttonColors(containerColor = Color(0xFFB46428))
+                    ) {
+                        Text("Connect Anyway", color = Color.White, fontWeight = FontWeight.Bold)
+                    }
+                }
+            }
+        }
+    }
+}
+
+private fun computeFingerprint(cert: X509Certificate, algorithm: String): String {
+    return try {
+        val md = MessageDigest.getInstance(algorithm)
+        val digest = md.digest(cert.encoded)
+        digest.joinToString(":") { "%02X".format(it.toInt() and 0xFF) }
+    } catch (e: Throwable) {
+        "Unable to compute fingerprint: ${e.message}"
+    }
+}

src/test/java/org/pubvm/a3270/HardwareKeyboardInputTest.kt

@@ -0,0 +1,168 @@
+package org.pubvm.a3270
+
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.lib3270j.TerminalModel
+import org.lib3270j.charset.EbcdicTranslator
+import org.lib3270j.input.InputProcessor
+import org.lib3270j.protocol.DS3270Constants.*
+import org.lib3270j.screen.ScreenBuffer
+
+class HardwareKeyboardInputTest {
+
+    private lateinit var screenBuffer: ScreenBuffer
+    private lateinit var translator: EbcdicTranslator
+    private lateinit var inputProcessor: InputProcessor
+
+    @Before
+    fun setUp() {
+        val model = TerminalModel.IBM_3279_2 // 24x80
+        translator = EbcdicTranslator()
+        screenBuffer = ScreenBuffer(model, translator)
+        inputProcessor = InputProcessor(screenBuffer, translator, null)
+    }
+
+    @Test
+    fun testUnformattedTypingAndNavigation() {
+        assertEquals(0, screenBuffer.cursorAddress)
+
+        // Type alphanumeric string
+        val text = "LOGON APPLID(TSO)"
+        for (ch in text) {
+            inputProcessor.typeCharacter(ch)
+        }
+
+        assertEquals(text.length, screenBuffer.cursorAddress)
+        for (i in text.indices) {
+            assertEquals(text[i], screenBuffer.getCell(i).ucs4)
+        }
+
+        // Navigation
+        inputProcessor.cursorLeft()
+        assertEquals(text.length - 1, screenBuffer.cursorAddress)
+
+        inputProcessor.cursorRight()
+        assertEquals(text.length, screenBuffer.cursorAddress)
+
+        inputProcessor.cursorDown()
+        assertEquals(80 + text.length, screenBuffer.cursorAddress)
+
+        inputProcessor.cursorUp()
+        assertEquals(text.length, screenBuffer.cursorAddress)
+
+        inputProcessor.cursorHome()
+        assertEquals(0, screenBuffer.cursorAddress)
+    }
+
+    @Test
+    fun testBackspaceAndForwardDelete() {
+        val text = "HELLO"
+        for (ch in text) {
+            inputProcessor.typeCharacter(ch)
+        }
+        assertEquals(5, screenBuffer.cursorAddress)
+
+        // Backspace moves left and deletes char
+        inputProcessor.backspace()
+        assertEquals(4, screenBuffer.cursorAddress)
+    }
+
+    @Test
+    fun testFormattedFieldInputAndTab() {
+        // Create formatted screen with protected label and unprotected input field
+        // Position 0: Protected FA
+        screenBuffer.setCellFA(0, (FA_PRINTABLE or FA_PROTECT).toByte())
+        // Set label "USERID:" at positions 1..7
+        val label = "USERID:"
+        for (i in label.indices) {
+            screenBuffer.getCell(i + 1).ucs4 = label[i]
+            screenBuffer.getCell(i + 1).ec = translator.unicodeToEbcdic(label[i]).toByte()
+        }
+
+        // Position 10: Unprotected FA
+        screenBuffer.setCellFA(10, FA_PRINTABLE.toByte())
+
+        // Position 20: Protected FA
+        screenBuffer.setCellFA(20, (FA_PRINTABLE or FA_PROTECT).toByte())
+
+        // Position 30: Unprotected FA
+        screenBuffer.setCellFA(30, FA_PRINTABLE.toByte())
+
+        screenBuffer.cursorAddress = 11
+
+        // Type into first field
+        val userid = "IBMUSER"
+        for (ch in userid) {
+            inputProcessor.typeCharacter(ch)
+        }
+        assertEquals(18, screenBuffer.cursorAddress)
+        for (i in userid.indices) {
+            assertEquals(userid[i], screenBuffer.getCell(11 + i).ucs4)
+        }
+
+        // Tab should jump to position 31 (next unprotected field)
+        inputProcessor.tab()
+        assertEquals(31, screenBuffer.cursorAddress)
+
+        // BackTab should jump back to position 11
+        inputProcessor.backTab()
+        assertEquals(11, screenBuffer.cursorAddress)
+
+        // Home should jump to first unprotected field (position 11)
+        screenBuffer.cursorAddress = 50
+        inputProcessor.cursorHome()
+        assertEquals(11, screenBuffer.cursorAddress)
+    }
+
+    @Test
+    fun testFormattedDeleteCharAndEraseEof() {
+        // Position 0: Unprotected FA
+        screenBuffer.setCellFA(0, FA_PRINTABLE.toByte())
+        // Position 10: Protected FA
+        screenBuffer.setCellFA(10, (FA_PRINTABLE or FA_PROTECT).toByte())
+
+        screenBuffer.cursorAddress = 1
+        val text = "ABCDE"
+        for (ch in text) {
+            inputProcessor.typeCharacter(ch)
+        }
+
+        // Move cursor to 'C' at pos 3
+        screenBuffer.cursorAddress = 3
+        inputProcessor.deleteChar()
+
+        // "ABDE "
+        assertEquals('A', screenBuffer.getCell(1).ucs4)
+        assertEquals('B', screenBuffer.getCell(2).ucs4)
+        assertEquals('D', screenBuffer.getCell(3).ucs4)
+        assertEquals('E', screenBuffer.getCell(4).ucs4)
+        assertEquals(0, screenBuffer.getCell(5).ec.toInt())
+
+        // Erase EOF from pos 3
+        inputProcessor.eraseEof()
+        assertEquals('A', screenBuffer.getCell(1).ucs4)
+        assertEquals('B', screenBuffer.getCell(2).ucs4)
+        assertEquals(0, screenBuffer.getCell(3).ec.toInt())
+        assertEquals(0, screenBuffer.getCell(4).ec.toInt())
+    }
+
+    @Test
+    fun testPfKeyAids() {
+        val pfAids = intArrayOf(
+            AID_PF1, AID_PF2, AID_PF3, AID_PF4, AID_PF5, AID_PF6,
+            AID_PF7, AID_PF8, AID_PF9, AID_PF10, AID_PF11, AID_PF12,
+            AID_PF13, AID_PF14, AID_PF15, AID_PF16, AID_PF17, AID_PF18,
+            AID_PF19, AID_PF20, AID_PF21, AID_PF22, AID_PF23, AID_PF24
+        )
+
+        for (i in 1..24) {
+            val aid = pfAids[i - 1]
+            inputProcessor.sendAid(aid)
+            assertEquals(aid, inputProcessor.lastAid)
+            assertTrue(inputProcessor.isKeyboardLocked)
+            inputProcessor.reset()
+            assertFalse(inputProcessor.isKeyboardLocked)
+        }
+    }
+}