Remove legacy JVM-specific file system, shell, and related implementations; migrate to platform-agnostic and common main modules.

.idea/misc.xml

@@ -3,7 +3,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="corretto-21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="corretto-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
   <component name="accountSettings">

build.gradle.kts

@@ -1,70 +1,75 @@
 @file:OptIn(ExperimentalDistributionDsl::class)
 
-import org.codehaus.groovy.tools.shell.util.Logger.io
 import org.jetbrains.kotlin.gradle.targets.js.dsl.ExperimentalDistributionDsl
 
 plugins {
-    kotlin("multiplatform") version "2.1.20"
+  kotlin("multiplatform") version "2.1.20"
 }
 
 group = "nl.astraeus"
 version = "0.1.0-SNAPSHOT"
 
 repositories {
-    mavenCentral()
+  mavenCentral()
-    maven {
+  maven {
-        url = uri("https://gitea.astraeus.nl/api/packages/rnentjes/maven")
+    url = uri("https://gitea.astraeus.nl/api/packages/rnentjes/maven")
-    }
+  }
-    maven {
+  maven {
-        url = uri("https://gitea.astraeus.nl:8443/api/packages/rnentjes/maven")
+    url = uri("https://gitea.astraeus.nl:8443/api/packages/rnentjes/maven")
-    }
+  }
 }
 
 kotlin {
-    jvmToolchain(17)
+  jvmToolchain(21)
-    jvm()
+  jvm()
-    js {
+  js {
-        binaries.executable()
+    binaries.executable()
-        browser {
+    browser {
-            distribution {
+      distribution {
-                outputDirectory.set(File("$projectDir/web/"))
+        outputDirectory.set(File("$projectDir/web/"))
-            }
+      }
-        }
     }
-    sourceSets {
+  }
-        val commonMain by getting {
-            dependencies {
-                api("nl.astraeus:kotlin-simple-logging:1.1.1")
-                api("nl.astraeus:kotlin-css-generator:1.0.10")
 
-                implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.0")
+  // Add this to enable ExperimentalStdlibApi globally
-            }
+  sourceSets.all {
-        }
+    languageSettings.optIn("kotlin.ExperimentalStdlibApi")
-        val commonTest by getting
+  }
-        val jvmMain by getting {
-            dependencies {
-                implementation("io.undertow:undertow-core:2.3.14.Final")
-                implementation("org.jetbrains.kotlinx:kotlinx-html-jvm:0.11.0")
 
-                implementation("org.xerial:sqlite-jdbc:3.32.3.2")
+  sourceSets {
-                implementation("com.zaxxer:HikariCP:4.0.3")
+    val commonMain by getting {
-                implementation("nl.astraeus:simple-jdbc-stats:1.6.1") {
+      dependencies {
-                    exclude(group = "org.slf4j", module = "slf4j-api")
+        api("nl.astraeus:kotlin-simple-logging:1.1.1")
-                }
+        api("nl.astraeus:kotlin-css-generator:1.0.10")
 
-              implementation("io.pebbletemplates:pebble:3.2.3")
+        implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.0")
-              implementation("com.google.code.gson:gson:2.12.1")
+      }
-            }
-        }
-        val jvmTest by getting {
-            dependencies {
-            }
-        }
-        val jsMain by getting {
-            dependencies {
-                implementation("nl.astraeus:kotlin-komponent:1.2.5")
-            }
-        }
-        val jsTest by getting
     }
-}
+    val commonTest by getting
+    val jvmMain by getting {
+      dependencies {
+        implementation("io.undertow:undertow-core:2.3.14.Final")
+        implementation("org.jetbrains.kotlinx:kotlinx-html-jvm:0.11.0")
+
+        implementation("org.xerial:sqlite-jdbc:3.32.3.2")
+        implementation("com.zaxxer:HikariCP:4.0.3")
+        implementation("nl.astraeus:simple-jdbc-stats:1.6.1") {
+          exclude(group = "org.slf4j", module = "slf4j-api")
+        }
+
+        implementation("io.pebbletemplates:pebble:3.2.3")
+        implementation("com.google.code.gson:gson:2.12.1")
+      }
+    }
+    val jvmTest by getting {
+      dependencies {
+      }
+    }
+    val jsMain by getting {
+      dependencies {
+        implementation("nl.astraeus:kotlin-komponent:1.2.5")
+      }
+    }
+    val jsTest by getting
+  }
+}

src/commonMain/kotlin/mtmc/asm/ASMElement.kt

@@ -4,9 +4,8 @@ import mtmc.tokenizer.MTMCToken
 
 abstract class ASMElement(
   val labels: List<MTMCToken>,
-  @JvmField var lineNumber: Int
+  var lineNumber: Int
 ) : HasLocation {
-  @JvmField
   var errors: MutableList<ASMError> = ArrayList()
   override var location: Int = 0
   override var sizeInBytes: Int = 0

src/commonMain/kotlin/mtmc/asm/ASMError.kt

@@ -2,10 +2,9 @@ package mtmc.asm
 
 import mtmc.tokenizer.MTMCToken
 
-@JvmRecord
 data class ASMError(
-  @JvmField val token: MTMCToken,
+  val token: MTMCToken,
-  @JvmField val error: String
+  val error: String
 ) {
   fun formattedErrorMessage(): String {
     return "Line " + token.line + ": " + error

src/commonMain/kotlin/mtmc/asm/Assembler.kt

@@ -25,12 +25,16 @@ import mtmc.emulator.Register.Companion.isReadable
 import mtmc.emulator.Register.Companion.isWriteable
 import mtmc.os.SysCall
 import mtmc.os.exec.Executable
+import mtmc.os.fs.File
 import mtmc.tokenizer.MTMCToken
 import mtmc.tokenizer.MTMCTokenizer
-import java.io.File
+
-import java.nio.charset.StandardCharsets
+fun MutableList<MTMCToken>.poll() = this.removeFirst()
-import java.util.*
+fun MutableList<MTMCToken>.peekFirst() = if (this.isEmpty()) {
-import java.util.stream.Collectors
+  null
+} else {
+  this[0]
+}
 
 class Assembler {
   var instructions: MutableList<Instruction> = ArrayList<Instruction>()
@@ -88,7 +92,7 @@ class Assembler {
 
     var location = 0
     var originalLineNumber = 0
-    val currentLocals: MutableMap<String?, LocalInfo?> = TreeMap<String?, LocalInfo?>()
+    val currentLocals: MutableMap<String?, LocalInfo?> = mutableMapOf()
     for (instruction in instructions) {
       val asmLineNumber = instruction.lineNumber
       if (instruction is MetaInstruction) {
@@ -145,10 +149,8 @@ class Assembler {
     val result = assemble(srcName, asm)
     if (!result.errors.isEmpty()) {
       throw RuntimeException(
-        "Errors:\n" + result.errors
+        "Errors:\n" + result.errors.joinToString("\n") { e: ASMError? -> " - " + e!!.formattedErrorMessage() }
-          .stream()
+      )
-          .map<String> { e: ASMError? -> " - " + e!!.formattedErrorMessage() }
-          .collect(Collectors.joining("\n")))
     }
 
     return Executable(
@@ -261,7 +263,10 @@ class Assembler {
       for (labelToken in labelTokens) {
         val labelData = Data(labelTokens, labelToken.line)
         if (hasLabel(labelToken.stringValue)) {
-          labelData.addError(tokens.poll(), "Label already defined: " + labelToken.stringValue)
+          labelData.addError(
+            tokens.removeFirst(),
+            "Label already defined: " + labelToken.stringValue
+          )
         } else {
           this.labels.put(labelToken.labelValue(), labelData)
         }
@@ -274,7 +279,7 @@ class Assembler {
     }
   }
 
-  private fun parseMetaDirective(tokens: LinkedList<MTMCToken>): Boolean {
+  private fun parseMetaDirective(tokens: MutableList<MTMCToken>): Boolean {
     if (tokens.size >= 2 && tokens.get(0).type == MTMCToken.TokenType.AT) {
       tokens.removeFirst()
       val metaInstruction = MetaInstruction(tokens.removeFirst())
@@ -306,26 +311,26 @@ class Assembler {
     return false
   }
 
-  private fun parseModeFlag(tokens: LinkedList<MTMCToken>): ASMMode? {
+  private fun parseModeFlag(tokens: MutableList<MTMCToken>): ASMMode? {
     if (tokens.size >= 2 && tokens.get(0).type == MTMCToken.TokenType.DOT && tokens.get(1).type == MTMCToken.TokenType.IDENTIFIER && tokens.get(
         0
       ).end == tokens.get(1).start && (tokens.get(1).stringValue == "data" ||
           tokens.get(1).stringValue == "text")
     ) {
-      return ASMMode.valueOf(tokens.get(1).stringValue.uppercase(Locale.getDefault()))
+      return ASMMode.valueOf(tokens.get(1).stringValue.uppercase())
     }
     return null
   }
 
-  private fun parseData(tokens: LinkedList<MTMCToken>, labelTokens: MutableList<MTMCToken>) {
+  private fun parseData(tokens: MutableList<MTMCToken>, labelTokens: MutableList<MTMCToken>) {
     lastLabels = mutableListOf()
-    var dataToken = tokens.poll()
+    var dataToken = tokens.removeFirst()
     var dataElt = Data(labelTokens, if (dataToken == null) 0 else dataToken.line)
     if (dataToken != null) {
       if (dataToken.type == MTMCToken.TokenType.STRING) {
-        val stringBytes = dataToken.stringValue.toByteArray(StandardCharsets.US_ASCII)
+        val stringBytes = dataToken.stringValue.encodeToByteArray()
         val nullTerminated = ByteArray(stringBytes.size + 1)
-        System.arraycopy(stringBytes, 0, nullTerminated, 0, stringBytes.size)
+        stringBytes.copyInto(nullTerminated, 0, 0, stringBytes.size)
         nullTerminated[stringBytes.size] = '\u0000'.code.toByte()
         dataElt.setValue(dataToken, nullTerminated)
       } else if (isInteger(dataToken)) {
@@ -338,7 +343,7 @@ class Assembler {
           byteArrayOf((integerValue ushr 8).toByte(), integerValue.toByte())
         )
       } else if (dataToken.type == MTMCToken.TokenType.DOT) {
-        dataToken = tokens.poll()
+        dataToken = tokens.removeFirst()
         dataElt = Data(labelTokens, dataToken.line)
         if (dataToken.stringValue == "int") {
           val intToken = requireIntegerToken(tokens, dataElt, MonTanaMiniComputer.MEMORY_SIZE)
@@ -359,7 +364,7 @@ class Assembler {
           dataElt.addError(dataToken, "only data types are .int, .byte, and .image")
         }
       } else if (dataToken.type == MTMCToken.TokenType.MINUS) {
-        val nextToken = tokens.poll() // get next
+        val nextToken = tokens.removeFirst() // get next
         if (nextToken == null || (nextToken.type != MTMCToken.TokenType.INTEGER && nextToken.type != MTMCToken.TokenType.HEX && nextToken.type != MTMCToken.TokenType.BINARY)) {
           dataElt.addError(dataToken, "Number is too negative")
         } else {
@@ -380,7 +385,7 @@ class Assembler {
 
     for (labelToken in labelTokens) {
       if (hasLabel(labelToken.stringValue)) {
-        dataElt.addError(tokens.poll(), "Label already defined: " + labelToken.stringValue)
+        dataElt.addError(tokens.removeFirst(), "Label already defined: " + labelToken.stringValue)
       } else {
         labels.put(labelToken.labelValue(), dataElt)
       }
@@ -405,9 +410,16 @@ class Assembler {
     return graphic
   }
 
-  private fun parseInstruction(tokens: LinkedList<MTMCToken>, labelTokens: MutableList<MTMCToken>) {
+  private fun parseInstruction(
+    tokens: MutableList<MTMCToken>,
+    labelTokens: MutableList<MTMCToken>
+  ) {
     var tokens = tokens
-    var instructionToken = tokens.peekFirst()
+    var instructionToken = if (tokens.isEmpty()) {
+      null
+    } else {
+      tokens[0]
+    }
     if (instructionToken == null) return
 
     lastLabels = mutableListOf()
@@ -510,7 +522,7 @@ class Assembler {
       }
 
       // if there is a stack register specified, consume it
-      if (!tokens.isEmpty() && tokens.peekFirst().type == MTMCToken.TokenType.IDENTIFIER) {
+      if (!tokens.isEmpty() && tokens.peekFirst()?.type == MTMCToken.TokenType.IDENTIFIER) {
         val stackReg = requireReadableRegister(tokens, stackInst)
         stackInst.setStackRegister(stackReg)
       }
@@ -550,7 +562,7 @@ class Assembler {
       loadInst.setPointerToken(pointerReg)
 
       // if there is an offset register specified, consume it
-      if (!tokens.isEmpty() && tokens.peekFirst().type == MTMCToken.TokenType.IDENTIFIER) {
+      if (!tokens.isEmpty() && tokens.peekFirst()?.type == MTMCToken.TokenType.IDENTIFIER) {
         val offsetReg = requireReadableRegister(tokens, loadInst)
         loadInst.setOffsetToken(offsetReg)
       }
@@ -598,7 +610,7 @@ class Assembler {
   //===================================================
   // tokenization helper functions
   //===================================================
-  private fun requireSysCall(tokens: LinkedList<MTMCToken>, inst: Instruction): MTMCToken {
+  private fun requireSysCall(tokens: MutableList<MTMCToken>, inst: Instruction): MTMCToken {
     val sysCallType = tokens.poll()
     if (sysCallType == null) {
       inst.addError("Syscall required")
@@ -610,7 +622,7 @@ class Assembler {
     return sysCallType!!
   }
 
-  private fun requireAluOp(tokens: LinkedList<MTMCToken>, inst: Instruction): MTMCToken {
+  private fun requireAluOp(tokens: MutableList<MTMCToken>, inst: Instruction): MTMCToken {
     val sysCallType = tokens.poll()
     if (sysCallType == null) {
       inst.addError("Syscall required")
@@ -623,7 +635,7 @@ class Assembler {
   }
 
   private fun requireWriteableRegister(
-    tokens: LinkedList<MTMCToken>,
+    tokens: MutableList<MTMCToken>,
     instruction: Instruction
   ): MTMCToken {
     val nextToken = tokens.poll()
@@ -638,7 +650,7 @@ class Assembler {
   }
 
   private fun requireReadableRegister(
-    tokens: LinkedList<MTMCToken>,
+    tokens: MutableList<MTMCToken>,
     instruction: Instruction
   ): MTMCToken {
     val nextToken = tokens.poll()
@@ -652,7 +664,7 @@ class Assembler {
     return nextToken!!
   }
 
-  private fun requireALUOp(tokens: LinkedList<MTMCToken>, instruction: Instruction): MTMCToken {
+  private fun requireALUOp(tokens: MutableList<MTMCToken>, instruction: Instruction): MTMCToken {
     val nextToken = tokens.poll()
     if (nextToken == null || nextToken.type != MTMCToken.TokenType.IDENTIFIER || !isALUOp(nextToken.stringValue)) {
       instruction.addError("ALU operation required")
@@ -660,7 +672,7 @@ class Assembler {
     return nextToken!!
   }
 
-  private fun requireString(tokens: LinkedList<MTMCToken>, instruction: ASMElement): MTMCToken {
+  private fun requireString(tokens: MutableList<MTMCToken>, instruction: ASMElement): MTMCToken {
     val nextToken = tokens.poll()
     if (nextToken == null || nextToken.type != MTMCToken.TokenType.STRING) {
       instruction.addError("String required")
@@ -669,7 +681,7 @@ class Assembler {
   }
 
   private fun requireIntegerToken(
-    tokens: LinkedList<MTMCToken>,
+    tokens: MutableList<MTMCToken>,
     inst: ASMElement,
     max: Int
   ): MTMCToken {
@@ -688,7 +700,7 @@ class Assembler {
   }
 
   private fun requireToken(
-    tokens: LinkedList<MTMCToken>,
+    tokens: MutableList<MTMCToken>,
     type: MTMCToken.TokenType,
     inst: ASMElement
   ): MTMCToken? {
@@ -700,7 +712,7 @@ class Assembler {
   }
 
   private fun requireIntegerOrLabelReferenceToken(
-    tokens: LinkedList<MTMCToken>,
+    tokens: MutableList<MTMCToken>,
     inst: LoadStoreInstruction
   ): MTMCToken {
     val token = tokens.poll()
@@ -713,9 +725,9 @@ class Assembler {
   }
 
 
-  private val tokensForLine: LinkedList<MTMCToken>
+  private val tokensForLine: MutableList<MTMCToken>
     get() {
-      val tokens = LinkedList<MTMCToken>()
+      val tokens = mutableListOf<MTMCToken>()
       if (tokenizer!!.more()) {
         val first = tokenizer!!.consume()
         tokens.add(first)
@@ -742,51 +754,51 @@ class Assembler {
   }
 
   companion object {
-    fun transformSyntheticInstructions(tokens: LinkedList<MTMCToken>): LinkedList<MTMCToken> {
+    fun transformSyntheticInstructions(tokens: MutableList<MTMCToken>): MutableList<MTMCToken> {
       if (!tokens.isEmpty()) {
-        val first = tokens.peekFirst()
+        val first = tokens.first()
         if (first.type == MTMCToken.TokenType.IDENTIFIER) {
           val stringVal = first.stringValue
           if (stringVal.endsWith("i")) {
             val op = stringVal.substring(0, stringVal.length - 1)
             if (isALUOp(op)) {
               val syntheticImmediate = tokens.removeFirst()
-              tokens.addFirst(syntheticImmediate.cloneWithVal(op))
+              tokens.add(0, syntheticImmediate.cloneWithVal(op))
-              tokens.addFirst(syntheticImmediate.cloneWithVal("imm"))
+              tokens.add(0, syntheticImmediate.cloneWithVal("imm"))
             }
           } else if (stringVal.startsWith("s")) {
             val op = stringVal.substring(1, stringVal.length)
             if (isALUOp(op)) {
               val syntheticImmediate = tokens.removeFirst()
-              tokens.addFirst(syntheticImmediate.cloneWithVal(op))
+              tokens.add(0, syntheticImmediate.cloneWithVal(op))
-              tokens.addFirst(syntheticImmediate.cloneWithVal("sop"))
+              tokens.add(0, syntheticImmediate.cloneWithVal("sop"))
             }
           } else if (stringVal == "la") {
             val syntheticImmediate = tokens.removeFirst()
-            tokens.addFirst(syntheticImmediate.cloneWithVal("li"))
+            tokens.add(0, syntheticImmediate.cloneWithVal("li"))
           } else if (stringVal == "ret") {
             val syntheticImmediate = tokens.removeFirst()
-            tokens.addFirst(syntheticImmediate.cloneWithVal("ra"))
+            tokens.add(0, syntheticImmediate.cloneWithVal("ra"))
-            tokens.addFirst(syntheticImmediate.cloneWithVal("jr"))
+            tokens.add(0, syntheticImmediate.cloneWithVal("jr"))
           }
         }
       }
       return tokens
     }
 
-    private fun maybeGetLabels(tokens: LinkedList<MTMCToken>): MutableList<MTMCToken> {
+    private fun maybeGetLabels(tokens: MutableList<MTMCToken>): MutableList<MTMCToken> {
-      val labels = LinkedList<MTMCToken>()
+      val labels = mutableListOf<MTMCToken>()
-      while (!tokens.isEmpty() && tokens.getFirst().type == MTMCToken.TokenType.LABEL) {
+      while (!tokens.isEmpty() && tokens.first().type == MTMCToken.TokenType.LABEL) {
-        val label = tokens.poll()
+        val label = tokens.removeFirst()
         labels.add(label!!)
       }
       return labels
     }
 
-    private fun maybeGetLabelReference(tokens: LinkedList<MTMCToken>): MTMCToken? {
+    private fun maybeGetLabelReference(tokens: MutableList<MTMCToken>): MTMCToken? {
       var label: MTMCToken? = null
-      if (tokens.getFirst().type == MTMCToken.TokenType.IDENTIFIER) {
+      if (tokens.first().type == MTMCToken.TokenType.IDENTIFIER) {
-        label = tokens.poll()
+        label = tokens.removeFirst()
       }
       return label
     }

src/commonMain/kotlin/mtmc/asm/AssemblyResult.kt

@@ -2,13 +2,12 @@ package mtmc.asm
 
 import mtmc.emulator.DebugInfo
 
-@JvmRecord
 data class AssemblyResult(
-  @JvmField val code: ByteArray,
+  val code: ByteArray,
   val data: ByteArray,
   val graphics: Array<ByteArray>,
-  @JvmField val debugInfo: DebugInfo?,
+  val debugInfo: DebugInfo?,
-  @JvmField val errors: MutableList<ASMError>
+  val errors: MutableList<ASMError>
 ) {
   fun printErrors(): String {
     val builder = StringBuilder("Errors:\n")

src/commonMain/kotlin/mtmc/asm/graphics/Graphic.kt

@@ -0,0 +1,45 @@
+package mtmc.asm.graphics
+
+import mtmc.asm.ASMElement
+import mtmc.tokenizer.MTMCToken
+
+/**
+ *
+ * @author jbanes
+ */
+class Graphic(labels: MutableList<MTMCToken>, lineNumber: Int) : ASMElement(labels, lineNumber) {
+  private var filename: String? = null
+  var imageData: ByteArray = ByteArray(0)
+
+  fun setImage(filename: String) {
+    /*    try {
+          var image = ImageIO.read(File(filename))
+          val buffer = ByteArrayOutputStream()
+
+          if (image.getWidth() > 1024 || image.getHeight() > 1024) {
+            addError(filename + " is too large. Maximum image size is 1024x1024")
+          }
+
+          image = convertImage(image)
+
+          ImageIO.write(image, "png", buffer)
+
+          this.filename = filename
+          this.imageData = buffer.toByteArray()
+        } catch (e: FileNotFoundException) {
+          e.printStackTrace()
+          addError("$filename not found")
+        } catch (e: IOException) {
+          e.printStackTrace()
+          addError(e.message ?: "error in Graphic") // TODO: Verify these messages are meaningful
+        }*/
+  }
+
+  override fun addError(err: String) {
+    addError(labels.last(), err)
+  }
+
+  override var sizeInBytes: Int
+    get() = 2
+    set(value) {}
+}

src/commonMain/kotlin/mtmc/asm/instructions/ALUInstruction.kt

@@ -5,7 +5,6 @@ import mtmc.emulator.Register.Companion.fromInteger
 import mtmc.emulator.Register.Companion.toInteger
 import mtmc.tokenizer.MTMCToken
 import mtmc.util.BinaryUtils
-import java.util.Locale
 
 class ALUInstruction(
   type: InstructionType,
@@ -38,7 +37,7 @@ class ALUInstruction(
   }
 
   val isBinaryOp: Boolean
-    get() = !ALUOp.valueOf(instructionToken.stringValue.uppercase(Locale.getDefault())).isUnary
+    get() = !ALUOp.valueOf(instructionToken.stringValue.uppercase()).isUnary
 
   override fun genCode(output: ByteArray, assembler: Assembler) {
     val opCode = ALUOp.toInteger(instructionToken.stringValue)
@@ -62,13 +61,12 @@ class ALUInstruction(
   }
 
   companion object {
-    @JvmStatic
     fun disassemble(instruction: Short): String? {
       if (BinaryUtils.getBits(16, 4, instruction).toInt() == 1) {
         val builder = StringBuilder()
         val opCode = BinaryUtils.getBits(12, 4, instruction)
         val op = ALUOp.fromInt(opCode)
-        val aluOp = ALUOp.valueOf(op.uppercase(Locale.getDefault()))
+        val aluOp = ALUOp.valueOf(op.uppercase())
         if (aluOp == ALUOp.IMM) {
           builder.append(op).append(" ")
           builder.append(fromInteger(BinaryUtils.getBits(8, 4, instruction).toInt())).append(" ")

src/commonMain/kotlin/mtmc/asm/instructions/ALUOp.kt

@@ -1,7 +1,5 @@
 package mtmc.asm.instructions
 
-import java.util.*
-
 enum class ALUOp(val opCode: Int, val isUnary: Boolean) {
   ADD(0x0000, false),
   SUB(0x0001, false),
@@ -21,20 +19,17 @@ enum class ALUOp(val opCode: Int, val isUnary: Boolean) {
   IMM(0x000F, true);
 
   companion object {
-    @JvmStatic
     fun toInteger(instruction: String): Int {
-      return valueOf(instruction.uppercase(Locale.getDefault())).opCode
+      return valueOf(instruction.uppercase()).opCode
     }
 
-    @JvmStatic
     fun fromInt(opCode: Short): String {
-      return entries[opCode.toInt()].name.lowercase(Locale.getDefault())
+      return entries[opCode.toInt()].name.lowercase()
     }
 
-    @JvmStatic
     fun isALUOp(op: String): Boolean {
       try {
-        val aluOp = valueOf(op.uppercase(Locale.getDefault()))
+        val aluOp = valueOf(op.uppercase())
         return true
       } catch (e: IllegalArgumentException) {
         return false

src/commonMain/kotlin/mtmc/asm/instructions/Instruction.kt

@@ -7,9 +7,9 @@ import mtmc.emulator.MonTanaMiniComputer.Companion.isDoubleWordInstruction
 import mtmc.tokenizer.MTMCToken
 
 abstract class Instruction(
-  @JvmField val type: InstructionType,
+  val type: InstructionType,
   labels: List<MTMCToken>,
-  @JvmField val instructionToken: MTMCToken
+  val instructionToken: MTMCToken
 ) : ASMElement(labels, instructionToken.line) {
   open fun validateLabel(assembler: Assembler) {
     // default does nothing
@@ -25,7 +25,6 @@ abstract class Instruction(
     get() = type.sizeInBytes
 
   companion object {
-    @JvmStatic
     fun isInstruction(cmd: String): Boolean {
       return InstructionType.fromString(cmd) != null
     }

src/commonMain/kotlin/mtmc/asm/instructions/InstructionType.kt

@@ -1,9 +1,7 @@
 package mtmc.asm.instructions
 
-import java.util.*
+enum class InstructionType constructor(
-
+  val instructionClass: InstructionClass?,
-enum class InstructionType @JvmOverloads constructor(
-  @JvmField val instructionClass: InstructionClass?,
   val sizeInBytes: Int = 2
 ) {
   SYS(InstructionClass.MISC),
@@ -86,10 +84,9 @@ enum class InstructionType @JvmOverloads constructor(
   }
 
   companion object {
-    @JvmStatic
     fun fromString(string: String): InstructionType? {
       try {
-        return valueOf(string.uppercase(Locale.getDefault()))
+        return valueOf(string.uppercase())
       } catch (e: IllegalArgumentException) {
         return null
       }

src/commonMain/kotlin/mtmc/emulator/DebugInfo.kt

@@ -0,0 +1,47 @@
+package mtmc.emulator
+
+import nl.astraeus.logger.getTimestamp
+
+data class DebugInfo(
+  val debugStrings: MutableList<String>,
+  val assemblyFile: String?,
+  val assemblySource: String,
+  val assemblyLineNumbers: IntArray,
+  val originalFile: String,
+  val originalLineNumbers: IntArray,
+  val globals: Array<GlobalInfo>,
+  val locals: Array<Array<LocalInfo?>>
+) {
+  fun handleDebugString(
+    debugIndex: Short,
+    monTanaMiniComputer: MonTanaMiniComputer
+  ) {
+    val debugString = debugStrings!!.get(debugIndex.toInt())
+    /*
+        val compile = Pattern.compile("(\\$[a-zA-Z][a-zA-Z0-9])")
+        val matcher = compile.matcher(debugString)
+        val formattedString = StringBuilder()
+        var start = 0
+        var end: Int
+        while (matcher.find()) {
+          val match = matcher.group().substring(1)
+          try {
+            end = matcher.start()
+            formattedString.append(debugString, start, end)
+            val register = Register.valueOf(match.uppercase())
+            formattedString.append(monTanaMiniComputer.getRegisterValue(register).toInt())
+            start = matcher.end()
+          } catch (e: Exception) {
+            formattedString.append(match)
+          }
+        }
+        formattedString.append(debugString.substring(start))
+        println("DEBUG[" + getTimestamp() + "] : " + formattedString)
+    */
+    println("DEBUG[" + getTimestamp() + "] : " + debugString)
+  }
+
+  data class GlobalInfo(val name: String?, val location: Int, val type: String?)
+
+  data class LocalInfo(val name: String?, val offset: Int, val type: String?)
+}

src/commonMain/kotlin/mtmc/emulator/MTMCClock.kt

@@ -1,21 +1,23 @@
 package mtmc.emulator
 
 import mtmc.emulator.MonTanaMiniComputer.ComputerStatus
+import mtmc.util.currentTimeMillis
 import kotlin.math.max
 
 /**
  *
  * @author jbanes
  */
-class MTMCClock
+class MTMCClock(
-  (private val computer: MonTanaMiniComputer) {
+  private val computer: MonTanaMiniComputer
+) {
   fun run() {
     var instructions: Long = 0
     var ips: Long = 0
     var expected: Long = 0
     var virtual: Long = 0
 
-    var startTime = System.currentTimeMillis()
+    var startTime = currentTimeMillis()
     var deltaStart: Long
     var delta: Long
 
@@ -28,8 +30,8 @@ class MTMCClock
       pulse = (if (speed <= 0) 1000000 else max(speed / 100, 1))
       ms = (if (pulse < 10) 1000 / speed else 10)
 
-      deltaStart = System.currentTimeMillis()
+      deltaStart = currentTimeMillis()
-      delta = ms - (System.currentTimeMillis() - deltaStart)
+      delta = ms - (currentTimeMillis() - deltaStart)
 
 
       /* We've lost more than a second. Recalibrate. */
@@ -50,11 +52,11 @@ class MTMCClock
       instructions += computer.pulse(pulse)
 
       virtual += pulse
-      ips = (virtual * 1000) / max(1, System.currentTimeMillis() - startTime)
+      ips = (virtual * 1000) / max(1, currentTimeMillis() - startTime)
-      expected = (System.currentTimeMillis() - startTime) * speed / 1000
+      expected = (currentTimeMillis() - startTime) * speed / 1000
     }
 
-    System.err.println("Executed " + instructions + " instructions at a rate of " + ips + " ips (speed = " + speed + ")")
+    //println("Executed " + instructions + " instructions at a rate of " + ips + " ips (speed = " + speed + ")")
   }
 
   fun step() {

src/commonMain/kotlin/mtmc/emulator/MTMCConsole.kt

@@ -1,16 +1,17 @@
 package mtmc.emulator
 
+import mtmc.os.fs.Console
+import mtmc.os.fs.System
 import mtmc.os.shell.Shell
 import mtmc.tokenizer.MTMCScanner
 import mtmc.tokenizer.MTMCToken
-import java.io.Console
 
 class MTMCConsole(private val computer: MonTanaMiniComputer) {
   var mode: Mode = Mode.NON_INTERACTIVE
   var sysConsole: Console? = null
 
   // non-interactive data
-  private val output = StringBuffer()
+  private val output = StringBuilder()
   private var shortValueSet = false
   private var shortValue: Short = 0
   private var stringValue: String? = null
@@ -18,7 +19,7 @@ class MTMCConsole(private val computer: MonTanaMiniComputer) {
   // TODO invert so shell is driving and console is just IO
   fun start() {
     mode = Mode.INTERACTIVE
-    sysConsole = System.console()
+    sysConsole = System.console
     Shell.printShellWelcome(computer)
     while (true) {
       val cmd = sysConsole!!.readLine("mtmc > ")
@@ -48,7 +49,7 @@ class MTMCConsole(private val computer: MonTanaMiniComputer) {
     if (mode == Mode.INTERACTIVE) {
       val tokens = MTMCScanner(sysConsole!!.readLine(), "#").tokenize()
       val token = tokens.first()
-      assert(token.type === MTMCToken.TokenType.CHAR)
+      check(token.type === MTMCToken.TokenType.CHAR)
       return token.charValue()
     } else {
       this.shortValueSet = false
@@ -88,7 +89,7 @@ class MTMCConsole(private val computer: MonTanaMiniComputer) {
     val text = if (index >= 0) output.substring(0, index + 1) else ""
 
     if (index >= 0) {
-      output.delete(0, index + 1)
+      output.removeRange(0, index + 1)
     }
 
     return text
@@ -121,7 +122,7 @@ class MTMCConsole(private val computer: MonTanaMiniComputer) {
   }
 
   fun resetOutput() {
-    output.delete(0, output.length)
+    output.removeRange(0, output.length)
   }
 
   enum class Mode {

src/commonMain/kotlin/mtmc/emulator/MTMCIO.kt

@@ -1,7 +1,5 @@
 package mtmc.emulator
 
-import java.util.*
-
 class MTMCIO {
   var value: Int = 0
 
@@ -17,12 +15,12 @@ class MTMCIO {
   }
 
   fun keyPressed(key: String) {
-    val button = Buttons.valueOf(key.uppercase(Locale.getDefault()))
+    val button = Buttons.valueOf(key.uppercase())
     value = value or button.mask
   }
 
   fun keyReleased(key: String) {
-    val button = Buttons.valueOf(key.uppercase(Locale.getDefault()))
+    val button = Buttons.valueOf(key.uppercase())
     value = value and button.mask.inv()
   }
 }

src/commonMain/kotlin/mtmc/emulator/MonTanaMiniComputer.kt

@@ -4,19 +4,7 @@ import mtmc.asm.instructions.Instruction
 import mtmc.os.MTOS
 import mtmc.os.fs.FileSystem
 import mtmc.util.BinaryUtils.getBits
-import java.lang.Byte
+import mtmc.util.Runnable
-import java.util.*
-import java.util.function.Consumer
-import java.util.stream.IntStream
-import kotlin.Array
-import kotlin.Boolean
-import kotlin.ByteArray
-import kotlin.Int
-import kotlin.IntArray
-import kotlin.Long
-import kotlin.Short
-import kotlin.ShortArray
-import kotlin.String
 import kotlin.experimental.and
 import kotlin.experimental.inv
 import kotlin.experimental.or
@@ -43,10 +31,10 @@ class MonTanaMiniComputer {
   var display: MTMCDisplay = MTMCDisplay(this)
   var clock: MTMCClock = MTMCClock(this)
   var fileSystem: FileSystem = FileSystem(this)
-  var rewindSteps: LinkedList<RewindStep>? = LinkedList<RewindStep>()
+  var rewindSteps = mutableListOf<RewindStep>()
 
   // listeners
-  private val observers: MutableList<MTMCObserver> = ArrayList<MTMCObserver>()
+  private val observers = mutableListOf<MTMCObserver>()
   var debugInfo: DebugInfo? = null
   private var currentRewindStep: RewindStep? = null
 
@@ -58,13 +46,15 @@ class MonTanaMiniComputer {
     registerFile = ShortArray(Register.entries.size)
     memory = ByteArray(MEMORY_SIZE)
     breakpoints = ByteArray(MEMORY_SIZE)
-    rewindSteps = null
+    rewindSteps.clear()
     setRegisterValue(
       Register.SP,
       MEMORY_SIZE.toShort().toInt()
     ) // default the stack pointer to the top of memory
-    rewindSteps = LinkedList<RewindStep>()
+    rewindSteps.clear()
-    observers!!.forEach(Consumer { obj: MTMCObserver? -> obj!!.computerReset() })
+    observers.forEach { obj ->
+      obj.computerReset()
+    }
   }
 
   fun load(code: ByteArray, data: ByteArray, debugInfo: DebugInfo?) {
@@ -79,11 +69,11 @@ class MonTanaMiniComputer {
 
 
     val codeBoundary = code.size
-    System.arraycopy(code, 0, memory, 0, codeBoundary)
+    code.copyInto(memory, 0, 0, codeBoundary)
     setRegisterValue(Register.CB, codeBoundary - 1)
 
     val dataBoundary = codeBoundary + data.size
-    System.arraycopy(data, 0, memory, codeBoundary, data.size)
+    code.copyInto(memory, codeBoundary, 0, data.size)
     setRegisterValue(Register.DB, dataBoundary - 1)
 
 
@@ -143,7 +133,9 @@ class MonTanaMiniComputer {
 
   fun fetchAndExecute() {
     currentRewindStep = RewindStep()
-    rewindSteps!!.push(currentRewindStep)
+    currentRewindStep?.let {
+      rewindSteps.add(0, it)
+    }
     fetchCurrentInstruction()
     val instruction = getRegisterValue(Register.IR)
     if (isDoubleWordInstruction(instruction)) {
@@ -158,7 +150,7 @@ class MonTanaMiniComputer {
   }
 
   fun execInstruction(instruction: Short) {
-    observers!!.forEach(Consumer { o: MTMCObserver? -> o!!.beforeExecution(instruction) })
+    observers!!.forEach({ o: MTMCObserver? -> o!!.beforeExecution(instruction) })
     val instructionType: Short = getBits(16, 4, instruction)
     if (instructionType.toInt() == 0x0000) { // MISC
       val topNibble: Int = getBits(12, 4, instruction).toInt()
@@ -710,7 +702,9 @@ class MonTanaMiniComputer {
     } else {
       badInstruction(instruction)
     }
-    observers.forEach(Consumer { o: MTMCObserver? -> o!!.afterExecution(instruction) })
+    observers.forEach { o: MTMCObserver? ->
+      o!!.afterExecution(instruction)
+    }
   }
 
   val isFlagTestBitSet: Boolean
@@ -733,7 +727,7 @@ class MonTanaMiniComputer {
   private fun badInstruction(instruction: Short) {
     setStatus(ComputerStatus.PERMANENT_ERROR)
     // TODO implement flags
-    console.println("BAD INSTRUCTION: 0x" + Integer.toHexString(instruction.toInt() and 0xFFFF))
+    console.println("BAD INSTRUCTION: 0x" + (instruction.toInt() and 0xFFFF).toHexString())
   }
 
   fun fetchCurrentInstruction() {
@@ -746,14 +740,16 @@ class MonTanaMiniComputer {
     } else {
       setRegisterValue(Register.DR, 0)
     }
-    observers!!.forEach(Consumer { o: MTMCObserver? -> o!!.instructionFetched(instruction) })
+    observers.forEach { o: MTMCObserver? ->
+      o!!.instructionFetched(instruction)
+    }
   }
 
   fun fetchWordFromMemory(address: Int): Short {
     val upperByte = fetchByteFromMemory(address).toShort()
     val lowerByte = fetchByteFromMemory(address + 1)
     var value = (upperByte.toInt() shl 8).toShort()
-    val i = value.toInt() or Byte.toUnsignedInt(lowerByte)
+    val i = value.toInt() or lowerByte.toInt()
     value = i.toShort()
     return value
   }
@@ -762,9 +758,8 @@ class MonTanaMiniComputer {
     if (address < 0 || address >= memory.size) {
       setStatus(ComputerStatus.PERMANENT_ERROR)
       console.println(
-        "BAD MEMORY LOCATION ON READ: " + address + " (0x" + Integer.toHexString(
+        "BAD MEMORY LOCATION ON READ: $address (0x" +
-          address and 0xFFFF
+            (address and 0xFFFF).toHexString() + ")"
-        ) + ")"
       )
       return 0
     } else {
@@ -782,23 +777,24 @@ class MonTanaMiniComputer {
     if (address < 0 || address >= memory.size) {
       setStatus(ComputerStatus.PERMANENT_ERROR)
       console.println(
-        "BAD MEMORY LOCATION ON WRITE: " + address + " (0x" + Integer.toHexString(
+        "BAD MEMORY LOCATION ON WRITE: " + address + " (0x" +
-          address and 0xFFFF
+            (address and 0xFFFF).toHexString() + ")"
-        ) + ")"
       )
       return
     }
     val currentValue = memory[address]
-    addRewindStep(Runnable { memory[address] = currentValue })
+    addRewindStep { memory[address] = currentValue }
     memory[address] = value
-    observers!!.forEach(Consumer { o: MTMCObserver? -> o!!.memoryUpdated(address, value) })
+    observers!!.forEach { o: MTMCObserver? ->
+      o!!.memoryUpdated(address, value)
+    }
   }
 
   private fun addRewindStep(runnable: Runnable?) {
     if (currentRewindStep != null && rewindSteps != null) {
       currentRewindStep!!.addSubStep(runnable)
-      if (rewindSteps!!.size > MAX_REWIND_STEPS) {
+      if (rewindSteps.size > MAX_REWIND_STEPS) {
-        rewindSteps!!.removeLast()
+        rewindSteps.removeLast()
       }
     }
   }
@@ -812,11 +808,13 @@ class MonTanaMiniComputer {
       // TODO mark as overflow
     }
     val currentValue = registerFile[register]
-    addRewindStep(Runnable {
+    addRewindStep {
       registerFile[register] = currentValue
-    })
+    }
     registerFile[register] = value.toShort()
-    observers!!.forEach(Consumer { o: MTMCObserver? -> o!!.registerUpdated(register, value) })
+    observers!!.forEach { o: MTMCObserver? ->
+      o!!.registerUpdated(register, value)
+    }
   }
 
   fun getRegisterValue(register: Register): Short {
@@ -850,7 +848,9 @@ class MonTanaMiniComputer {
   }
 
   fun getBytesFromMemory(address: Int, length: Int): ByteArray {
-    return Arrays.copyOfRange(memory, address, address + length)
+    val result = ByteArray(length)
+    memory.copyInto(result, 0, address, address + length)
+    return result
   }
 
   val oS: MTOS
@@ -858,18 +858,15 @@ class MonTanaMiniComputer {
 
   val memoryAddresses: Iterable<Int?>
     get() = Iterable {
-      IntStream.range(
+      (0..MEMORY_SIZE).iterator()
-        0,
-        MEMORY_SIZE
-      ).iterator()
     }
 
   fun addObserver(observer: MTMCObserver?) {
-    observers!!.add(observer!!)
+    observers.add(observer!!)
   }
 
   fun removeObserver(observer: MTMCObserver?) {
-    observers!!.remove(observer!!)
+    observers.remove(observer!!)
   }
 
   fun pause() {
@@ -936,7 +933,7 @@ class MonTanaMiniComputer {
   fun setArg(arg: String) {
     if (!arg.isEmpty()) {
       val start = getRegisterValue(Register.BP)
-      val bytes = arg.toByteArray()
+      val bytes = arg.encodeToByteArray()
       writeStringToMemory(start.toInt(), bytes)
       setRegisterValue(Register.A0, start.toInt())
       setRegisterValue(Register.BP, start + bytes.size + 1)
@@ -953,7 +950,7 @@ class MonTanaMiniComputer {
   }
 
   fun rewind() {
-    val latestRewindStep = rewindSteps!!.pop()
+    val latestRewindStep = rewindSteps.removeFirst()
     latestRewindStep.rewind()
   }
 
@@ -1020,7 +1017,6 @@ class MonTanaMiniComputer {
       return false
     }
 
-    @JvmStatic
     fun main(args: Array<String>) {
       val computer = MonTanaMiniComputer()
       computer.speed = 1 // default to 1hz

src/commonMain/kotlin/mtmc/emulator/Register.kt

@@ -73,4 +73,4 @@ enum class Register {
             }
         }
     }
-}
+}

src/commonMain/kotlin/mtmc/emulator/RewindStep.kt

@@ -1,10 +1,12 @@
 package mtmc.emulator
 
+import mtmc.util.Runnable
+
 class RewindStep {
   var subSteps: MutableList<Runnable?> = ArrayList<Runnable?>()
 
   fun rewind() {
-    subSteps.reversed().forEach({ obj: Runnable? -> obj!!.run() })
+    subSteps.reversed().forEach({ obj: Runnable? -> obj!!.invoke() })
   }
 
   fun addSubStep(subStep: Runnable?) {

src/commonMain/kotlin/mtmc/os/MTOS.kt

@@ -3,18 +3,17 @@ package mtmc.os
 import mtmc.emulator.MonTanaMiniComputer
 import mtmc.emulator.Register
 import mtmc.os.SysCall.Companion.getValue
+import mtmc.os.fs.File
+import mtmc.os.fs.Files
 import mtmc.os.shell.Shell
-import java.io.File
+import mtmc.util.currentTimeMillis
-import java.io.IOException
-import java.nio.file.Files
-import java.util.*
 import kotlin.math.max
 import kotlin.math.min
-import kotlin.text.Charsets.US_ASCII
+import kotlin.random.Random
 
 class MTOS(private val computer: MonTanaMiniComputer) {
   private var timer: Long = 0
-  var random: Random = Random()
+  var random: Random = Random.Default
 
   // Editor support
   var currentFile: String? = null
@@ -98,7 +97,7 @@ class MTOS(private val computer: MonTanaMiniComputer) {
         }
       }
       val string = computer.console.readString()
-      val bytes = string!!.toByteArray(US_ASCII)
+      val bytes = string!!.encodeToByteArray()
       val bytesToRead = min(bytes.size, maxLen.toInt())
       for (i in 0..<bytesToRead) {
         val aByte = bytes[i]
@@ -242,8 +241,8 @@ class MTOS(private val computer: MonTanaMiniComputer) {
         // special handling for game-of-life cell files
         if ("cells" == fileType) {
           val str = Files.readString(file.toPath())
-          val lines = Arrays
+          val lines: List<String> =
-            .stream<String>(str.split("\n".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray())
+            str.split("\n".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
             .filter { s: String? -> !s!!.startsWith("!") }
             .toList()
 
@@ -251,7 +250,7 @@ class MTOS(private val computer: MonTanaMiniComputer) {
           val cappedLines = min(linesTotal, maxSize2.toInt())
 
           for (lineNum in 0..<cappedLines) {
-            val line = lines.get(lineNum)
+            val line: String = lines.get(lineNum)
             for (colNum in 0..<maxSize1) {
               val offset = lineNum * maxSize1 + colNum
               val byteOffset = offset / 8
@@ -275,7 +274,7 @@ class MTOS(private val computer: MonTanaMiniComputer) {
           }
         }
         computer.setRegisterValue(Register.RV, 0)
-      } catch (e: IOException) {
+      } catch (e: Exception) {
         computer.setRegisterValue(Register.RV, -1)
         e.printStackTrace() // debugging
       }
@@ -290,7 +289,6 @@ class MTOS(private val computer: MonTanaMiniComputer) {
         computer.writeByteToMemory(destination + i, aByte)
       }
 
-
       //TODO: Should this return the length with or without the null terminator?
       computer.writeByteToMemory(destination + maxSize - 1, 0.toByte())
       computer.setRegisterValue(Register.RV, maxSize - 1)
@@ -300,18 +298,18 @@ class MTOS(private val computer: MonTanaMiniComputer) {
 
       if (computer.fileSystem.exists(dir)) {
         computer.setRegisterValue(Register.RV, 0)
-        computer.fileSystem.setCWD(dir)
+        computer.fileSystem.cWD = dir
       } else {
         computer.setRegisterValue(Register.RV, 1)
       }
     } else if (syscallNumber == getValue("timer").toShort()) {
       val value = computer.getRegisterValue(Register.A0)
 
-      if (value > 0) this.timer = System.currentTimeMillis() + value
+      if (value > 0) this.timer = currentTimeMillis() + value
 
       computer.setRegisterValue(
         Register.RV,
-        max(0, this.timer - System.currentTimeMillis()).toInt()
+        max(0, this.timer - currentTimeMillis()).toInt()
       )
     } else if (syscallNumber == getValue("drawimg").toShort()) {
       val image = computer.getRegisterValue(Register.A0)
@@ -401,10 +399,13 @@ class MTOS(private val computer: MonTanaMiniComputer) {
         }
 
         val file = list[offset.toInt()]
-        val name = file.getName()
+        val name = file.name
         val size = min(maxSizeOut - 1, name.length)
 
-        computer.writeWordToMemory(destination.toInt(), if (file.isDirectory()) 1 else 0)
+        computer.writeWordToMemory(
+          destination.toInt(),
+          if (file.directory) 1 else 0
+        )
 
         for (i in 0..<size) {
           val aByte = name.get(i).code.toByte()
@@ -433,9 +434,9 @@ class MTOS(private val computer: MonTanaMiniComputer) {
       length++
     }
     try {
-      val outputString = String(computer.memory, pointer.toInt(), length.toInt(), US_ASCII)
+      val outputString = computer.memory.decodeToString(pointer.toInt(), pointer.toInt() + length)
       return outputString
-    } catch (ignored: StringIndexOutOfBoundsException) {
+    } catch (ignored: IndexOutOfBoundsException) {
       computer.setStatus(MonTanaMiniComputer.ComputerStatus.PERMANENT_ERROR)
       return ""
     }
@@ -447,9 +448,12 @@ class MTOS(private val computer: MonTanaMiniComputer) {
     }
   }
 
-  fun loadFile(path: String?): File {
+  fun loadFile(path: String?): File = File(path ?: "<empty>")
-    val fs = computer.fileSystem
+  /*
-    val file = fs.getRealPath(path).toFile()
+    {
-    return file
+      val fs = computer.fileSystem
-  }
+      val file = fs.getRealPath(path).toFile()
+      return file
+    }
+  */
 }

src/commonMain/kotlin/mtmc/os/SysCall.kt

@@ -1,7 +1,5 @@
 package mtmc.os
 
-import java.util.*
-
 enum class SysCall(value: Int) {
   EXIT(0x00),
   RINT(0x01),
@@ -50,25 +48,24 @@ enum class SysCall(value: Int) {
   companion object {
     fun isSysCall(call: String): Boolean {
       try {
-        valueOf(call.uppercase(Locale.getDefault()))
+        valueOf(call.uppercase())
         return true
       } catch (e: IllegalArgumentException) {
         return false
       }
     }
 
-    @JvmStatic
     fun getValue(call: String): Byte {
-      return valueOf(call.uppercase(Locale.getDefault())).value
+      return valueOf(call.uppercase()).value
     }
 
     fun getString(syscallCode: Byte): String? {
       for (o in entries) {
         if (o.value == syscallCode) {
-          return o.name.lowercase(Locale.getDefault())
+          return o.name.lowercase()
         }
       }
       return null
     }
   }
-}
+}

src/commonMain/kotlin/mtmc/os/exec/Executable.kt

@@ -0,0 +1,58 @@
+package mtmc.os.exec
+
+import mtmc.emulator.DebugInfo
+import mtmc.os.fs.Path
+
+data class Executable(
+  val format: Format,
+  val code: ByteArray,
+  val data: ByteArray,
+  val graphics: Array<ByteArray>,
+  val sourceName: String,
+  val debugInfo: DebugInfo?
+) {
+  enum class Format(val formatName: String) {
+    Orc1("orc1");
+  }
+
+  fun dump(): String? {
+    return null //Gson().toJson(this)
+  }
+
+  fun dump(path: Path) {
+    /*
+        FileWriter(path.toFile()).use { fw ->
+          dump(fw)
+        }
+    */
+  }
+
+  /*
+    fun dump(writer: Writer?) {
+      val gson = Gson()
+      gson.toJson(this, writer)
+    }
+  */
+
+  companion object {
+    fun load(exe: String?): Executable? {
+      return null //Gson().fromJson<Executable?>(exe, Executable::class.java)
+    }
+
+    fun load(path: Path): Executable? = null
+    /*
+        {
+          FileReader(path.toFile()).use { fw ->
+            return load(fw)
+          }
+        }
+    */
+
+    /*
+        fun load(reader: Reader): Executable? {
+          val gson = Gson()
+          return gson.fromJson<Executable?>(reader, Executable::class.java)
+        }
+    */
+  }
+}

src/commonMain/kotlin/mtmc/os/fs/Console.kt

@@ -0,0 +1,11 @@
+package mtmc.os.fs
+
+object System {
+  val console: Console = Console()
+}
+
+class Console {
+  fun readLine(prompt: String? = ""): String {
+    TODO("Not yet implemented")
+  }
+}

src/commonMain/kotlin/mtmc/os/fs/File.kt

@@ -0,0 +1,47 @@
+package mtmc.os.fs
+
+object Files {
+  fun readString(toPath: Path): String {
+    TODO("Not yet implemented")
+  }
+
+  fun readAllBytes(toPath: Path): ByteArray {
+    TODO("Not yet implemented")
+  }
+
+}
+
+class File(
+  val parent: File? = null,
+  val name: String
+) {
+
+  var directory: Boolean = TODO("initialize me")
+
+  constructor(name: String) : this(null, name)
+
+  fun getParent(): File = parent ?: error("No parent")
+
+  fun getPath(): String = if (parent == null) {
+    name
+  } else {
+    "${parent.getPath()}/$name"
+  }
+
+  fun exists(): Boolean {
+    TODO("Not yet implemented")
+  }
+
+  fun getAbsolutePath(): String {
+    TODO("Not yet implemented")
+  }
+
+  fun toPath(): Path {
+    TODO("Not yet implemented")
+  }
+
+  fun listFiles(): Array<File> {
+    TODO("Not yet implemented")
+  }
+
+}

src/commonMain/kotlin/mtmc/os/fs/FileSystem.kt

@@ -0,0 +1,213 @@
+package mtmc.os.fs
+
+import mtmc.emulator.MonTanaMiniComputer
+import kotlin.jvm.JvmField
+
+class FileSystem(
+  val computer: MonTanaMiniComputer
+) {
+  private var cwd = "/home"
+
+  init {
+    initFileSystem()
+  }
+
+  private fun initFileSystem() {
+    /*
+        if (DISK_PATH.toFile().exists()) return
+
+
+        // Make the disk/ directory
+        DISK_PATH.toFile().mkdirs()
+
+        try {
+          ZipInputStream(getClass().getResourceAsStream("/disk.zip")).use { `in` ->
+            var entry: ZipEntry?
+            var file: File?
+
+            val data = ByteArray(4096)
+            var count: Int
+            while ((`in`.getNextEntry().also { entry = it }) != null) {
+              file = File(entry.getName())
+
+              if (entry.isDirectory()) {
+                file.mkdirs()
+              } else {
+                file.getParentFile().mkdirs()
+
+                FileOutputStream(file).use { out ->
+                  while ((`in`.read(data).also { count = it }) > 0) {
+                    out.write(data, 0, count)
+                  }
+                }
+              }
+            }
+          }
+        } catch (e: IOException) {
+          e.printStackTrace()
+        }
+    */
+  }
+
+  private fun notifyOfFileSystemUpdate() {
+    if (this.computer != null) {
+      computer.notifyOfFileSystemUpdate()
+    }
+  }
+
+  var cWD: String
+    get() = this.cwd
+    set(cwd) {
+      this.cwd = resolve(cwd)
+      this.notifyOfFileSystemUpdate()
+    }
+
+  fun exists(path: String): Boolean {
+    return false //File(DISK_PATH.toFile(), resolve(path)).exists()
+  }
+
+  fun mkdir(path: String): Boolean {
+    /*
+        val success: Boolean = File(DISK_PATH.toFile(), resolve(path)).mkdir()
+
+        if (success) {
+          computer.notifyOfFileSystemUpdate()
+        }
+
+        return success
+    */
+    return true
+  }
+
+  fun delete(path: String): Boolean {
+    /*
+        val success: Boolean = File(DISK_PATH.toFile(), resolve(path)).delete()
+
+        if (success) {
+          computer.notifyOfFileSystemUpdate()
+        }
+
+        return success
+    */
+    return true
+  }
+
+  fun resolve(filename: String): String = filename
+  /*
+    {
+      val root: File = DISK_PATH.toFile()
+      var directory = if (filename.startsWith("/")) root else File(root, cwd)
+      val path: Array<String> = filename.split("/")
+
+      for (name in path) {
+        if (name.equals(".")) {
+          continue
+        } else if (name.equals("..") && directory.equals(root)) {
+          continue
+        } else if (name.equals("..")) {
+          directory = directory.getParentFile()
+        } else {
+          directory = File(directory, name)
+        }
+      }
+
+      if (directory.equals(root)) {
+        return "/"
+      }
+
+      return directory.getAbsolutePath().substring(root.getAbsolutePath().length())
+    }
+  */
+
+  fun getRealPath(path: String): Path { // Resolves given path and returns /disk/ + path
+    val resolvedPath = resolve(path)
+    val slashGone: String = if (resolvedPath.length > 0) resolvedPath.substring(1) else ""
+    val file: File = DISK_PATH.resolve(slashGone).toFile()
+
+    if (file.getAbsolutePath().length < DISK_PATH.toFile().getAbsolutePath().length) {
+      return DISK_PATH
+    }
+
+    return file.toPath()
+  }
+
+  fun getFileList(path: String): Array<File> {
+    val resolvedPath: File = getRealPath(path).toFile()
+
+    if (!resolvedPath.directory) return arrayOf<File>(resolvedPath)
+
+    return resolvedPath.listFiles()
+  }
+
+  fun listFiles(path: String): Listing {
+    val resolvedPath: File = getRealPath(path).toFile()
+
+    return Listing(this, resolvedPath)
+  }
+
+  fun listCWD(): Listing {
+    return listFiles(cwd)
+  }
+
+  fun listRoot(): Listing {
+    return listFiles("/")
+  }
+
+  fun writeFile(path: String, contents: String?) {
+    val filePath: Path = getRealPath(path)
+    //Files.writeString(filePath, contents)
+  }
+
+  fun readFile(path: String): String? {
+    val filePath: Path = getRealPath(path)
+    val contents = ""  //Files.readString(filePath)
+    return contents
+  }
+
+  fun getMimeType(path: String): String {
+    val file: Path = getRealPath(path)
+    val name = file.toFile().name.lowercase()
+    val probed = file.probeContentType()
+
+    if (name.endsWith(".asm")) return "text/x-asm"
+    if (name.endsWith(".c")) return "text/x-csrc"
+    if (name.endsWith(".sea")) return "text/x-csrc"
+    if (name.endsWith(".h")) return "text/x-csrc"
+    if (probed != null) return probed
+
+    return "application/octet-stream"
+  }
+
+  /*
+    fun openFile(path: String): InputStream? {
+      val file: Unit */
+  /* TODO: class org.jetbrains.kotlin.nj2k.types.JKJavaNullPrimitiveType *//*
+? =
+      getRealPath(path).toFile()
+
+    return FileInputStream(file)
+  }
+*/
+
+  /*
+    fun saveFile(path: String, contents: InputStream) {
+      val file: Unit */
+  /* TODO: class org.jetbrains.kotlin.nj2k.types.JKJavaNullPrimitiveType *//*
+? =
+      getRealPath(path).toFile()
+    val data = ByteArray(4096)
+    var count: Int
+
+    FileOutputStream(file).use { out ->
+      while ((contents.read(data).also { count = it }) > 0) {
+        out.write(data, 0, count)
+      }
+    }
+  }
+*/
+
+  companion object {
+    @JvmField
+    val DISK_PATH: Path = Path() //.of(System.getProperty("user.dir"), "disk").toAbsolutePath()
+  }
+}

src/commonMain/kotlin/mtmc/os/fs/Listing.kt

@@ -0,0 +1,45 @@
+package mtmc.os.fs
+
+class Listing(
+  val fs: FileSystem,
+  val file: File
+) {
+  val path: String
+  val name: String
+  val directory: Boolean
+  val root: Boolean
+
+  init {
+    val root = FileSystem.DISK_PATH.toFile().getAbsolutePath().replace('\\', '/')
+    val path = file.getAbsolutePath().substring(root.length).replace('\\', '/')
+
+    this.path = if (path.length > 0) path else "/"
+    this.name = if (path.length > 0) file.name else "/"
+    this.directory = file.directory
+    this.root = this.path.equals("/")
+  }
+
+  val parent: Listing?
+    get() = if (file.parent != null) {
+      Listing(fs, file.parent)
+    } else {
+      null
+    }
+
+  fun list(): List<Listing> {
+    if (!directory) {
+      return ArrayList()
+    }
+
+    val list = ArrayList<Listing>()
+    val children = file.listFiles()
+
+    list.sortBy { it.name }
+
+    for (child in children) {
+      list.add(Listing(fs, child))
+    }
+
+    return list
+  }
+}

src/commonMain/kotlin/mtmc/os/fs/Path.kt

@@ -0,0 +1,15 @@
+package mtmc.os.fs
+
+class Path {
+  fun toFile(): File {
+    TODO("Not yet implemented")
+  }
+
+  fun probeContentType(): String? {
+    TODO("Not yet implemented")
+  }
+
+  fun resolve(filename: String): Path {
+    TODO("Not yet implemented")
+  }
+}

src/commonMain/kotlin/mtmc/os/shell/Shell.kt

@@ -1,160 +1,163 @@
-package mtmc.os.shell;
+package mtmc.os.shell
 
-import mtmc.asm.Assembler;
+import mtmc.asm.Assembler
-import mtmc.asm.AssemblyResult;
+import mtmc.asm.instructions.Instruction.Companion.isInstruction
-import mtmc.asm.instructions.Instruction;
+import mtmc.asm.peekFirst
-import mtmc.emulator.DebugInfo;
+import mtmc.emulator.MonTanaMiniComputer
-import mtmc.emulator.MonTanaMiniComputer;
+import mtmc.emulator.Register
-import mtmc.emulator.Register;
+import mtmc.os.fs.FileSystem
-import mtmc.os.exec.Executable;
+import mtmc.os.shell.builtins.AssembleCommand
-import mtmc.os.fs.FileSystem;
+import mtmc.os.shell.builtins.DisplayCommand
-import mtmc.os.shell.builtins.AssembleCommand;
+import mtmc.os.shell.builtins.ExitCommand
-import mtmc.os.shell.builtins.DisplayCommand;
+import mtmc.os.shell.builtins.GetCommand
-import mtmc.os.shell.builtins.ExitCommand;
+import mtmc.os.shell.builtins.HelpCommand
-import mtmc.os.shell.builtins.GetCommand;
+import mtmc.os.shell.builtins.LoadCommand
-import mtmc.os.shell.builtins.HelpCommand;
+import mtmc.os.shell.builtins.PauseCommand
-import mtmc.os.shell.builtins.LoadCommand;
+import mtmc.os.shell.builtins.RunCommand
-import mtmc.os.shell.builtins.PauseCommand;
+import mtmc.os.shell.builtins.SeacCommand
-import mtmc.os.shell.builtins.RunCommand;
+import mtmc.os.shell.builtins.SetCommand
-import mtmc.os.shell.builtins.SeacCommand;
+import mtmc.os.shell.builtins.SpeedCommand
-import mtmc.os.shell.builtins.SetCommand;
+import mtmc.os.shell.builtins.StepCommand
-import mtmc.os.shell.builtins.SpeedCommand;
+import mtmc.os.shell.builtins.WebCommand
-import mtmc.os.shell.builtins.StepCommand;
+import mtmc.tokenizer.MTMCToken
-import mtmc.os.shell.builtins.WebCommand;
+import mtmc.tokenizer.MTMCTokenizer
-import mtmc.tokenizer.MTMCToken;
-import mtmc.tokenizer.MTMCTokenizer;
 
-import java.nio.file.NoSuchFileException;
+object Shell {
-import java.nio.file.Path;
+  private val COMMANDS: MutableMap<String?, ShellCommand> = LinkedHashMap<String?, ShellCommand>()
-import java.util.LinkedHashMap;
-import java.util.LinkedList;
-import java.util.Map;
 
-import static mtmc.tokenizer.MTMCToken.TokenType.IDENTIFIER;
+  init {
-import static mtmc.tokenizer.MTMCToken.TokenType.QUESTION_MARK;
+    COMMANDS.put("help", HelpCommand())
+    COMMANDS.put("exit", ExitCommand())
+    COMMANDS.put("set", SetCommand())
+    COMMANDS.put("get", GetCommand())
+    COMMANDS.put("web", WebCommand())
+    COMMANDS.put("disp", DisplayCommand())
+    COMMANDS.put("asm", AssembleCommand())
+    COMMANDS.put("load", LoadCommand())
+    COMMANDS.put("step", StepCommand())
+    COMMANDS.put("run", RunCommand())
+    COMMANDS.put("pause", PauseCommand())
+    COMMANDS.put("speed", SpeedCommand())
+    COMMANDS.put("sc", SeacCommand())
+  }
 
-public class Shell {
+  fun isCommand(cmd: String): Boolean {
-    private static final Map<String, ShellCommand> COMMANDS = new LinkedHashMap<>();
+    return COMMANDS.containsKey(cmd.lowercase())
+  }
 
-    static {
+  private fun findExecutable(path: String?, fs: FileSystem): Boolean {
-        COMMANDS.put("help", new HelpCommand());
+    if (path == null || path == "") return false
-        COMMANDS.put("exit", new ExitCommand());
+    //if (fs.exists(path) && !fs.listFiles(path).directory) return true
-        COMMANDS.put("set", new SetCommand());
+    //if (fs.exists("/bin/" + path) && !fs.listFiles("/bin/" + path).directory) return true
-        COMMANDS.put("get", new GetCommand());
-        COMMANDS.put("web", new WebCommand());
-        COMMANDS.put("disp", new DisplayCommand());
-        COMMANDS.put("asm", new AssembleCommand());
-        COMMANDS.put("load", new LoadCommand());
-        COMMANDS.put("step", new StepCommand());
-        COMMANDS.put("run", new RunCommand());
-        COMMANDS.put("pause", new PauseCommand());
-        COMMANDS.put("speed", new SpeedCommand());
-        COMMANDS.put("sc", new SeacCommand());
-    }
 
-    public static boolean isCommand(String cmd) {
+    return false
-        return COMMANDS.containsKey(cmd.toLowerCase());
+  }
-    }
+
-    
+  @Throws(Exception::class)
-    private static boolean findExecutable(String path, FileSystem fs) {
+  private fun runExecutable(
-        if (path == null || path.equals("")) return false;
+    file: String,
-        if (fs.exists(path) && !fs.listFiles(path).directory) return true;
+    command: String,
-        if (fs.exists("/bin/" + path) && !fs.listFiles("/bin/" + path).directory) return true;
+    tokens: MTMCTokenizer,
-        
+    computer: MonTanaMiniComputer
-        return false;
+  ) {
-    }
+    val fs = computer.fileSystem
-    
+    /*
-    private static void runExecutable(String file, String command, MTMCTokenizer tokens, MonTanaMiniComputer computer) throws Exception {
+        var srcPath = Path.of("disk/" + fs.resolve(file))
-        FileSystem fs = computer.getFileSystem();
+        if (!srcPath.toFile().exists()) {
-        Path srcPath = Path.of("disk/" + fs.resolve(file));
+          srcPath = Path.of("disk" + fs.resolve("/bin/" + file))
-        if(!srcPath.toFile().exists()) {
-            srcPath = Path.of("disk" + fs.resolve("/bin/" + file));
         }
-        Executable exec = Executable.load(srcPath);
+        val exec = load(srcPath)
-        computer.load(exec.code, exec.data, exec.graphics, exec.debugInfo);
+        computer.load(exec!!.code, exec.data, exec.graphics, exec.debugInfo)
-        tokens.consume();
+        tokens.consume()
-        String arg = command.substring(file.length()).strip();
+        val arg = command.substring(file.length).trim()
-        computer.getOS().applyBreakpoints();
+        computer.oS.applyBreakpoints()
-        computer.setArg(arg);
+        computer.setArg(arg)
-        computer.run();
+        computer.run()
-    }
+    */
-    
+  }
-    public static void execCommand(String command, MonTanaMiniComputer computer) {
+
-        MTMCTokenizer tokens = new MTMCTokenizer(command, "#");
+  fun execCommand(command: String, computer: MonTanaMiniComputer) {
-        try {
+    val tokens = MTMCTokenizer(command, "#")
-            MTMCToken identifier = tokens.matchAndConsume(IDENTIFIER);
+    try {
-            String cmd;
+      val identifier = tokens.matchAndConsume(MTMCToken.TokenType.IDENTIFIER)
-            if (identifier == null) {
+      val cmd: String?
-                MTMCToken question = tokens.matchAndConsume(QUESTION_MARK);
+      if (identifier == null) {
-                String executable = tokens.collapseTokensAsString();
+        val question = tokens.matchAndConsume(MTMCToken.TokenType.QUESTION_MARK)
-                
+        val executable = tokens.collapseTokensAsString()
-                // alias ? to help
+
-                if (question != null) {
+
-                    cmd = "help";
+        // alias ? to help
-                } else if (findExecutable(executable, computer.getFileSystem())) {
+        if (question != null) {
-                    cmd = executable;
+          cmd = "help"
-                } else {
+        } else if (findExecutable(executable, computer.fileSystem)) {
-                    printShellHelp(computer);
+          cmd = executable
-                    return;
+        } else {
-                }
+          printShellHelp(computer)
-            } else {
+          return
-                cmd = identifier.stringValue();
+        }
+      } else {
+        cmd = identifier.stringValue()
+      }
+      if (isCommand(cmd)) {
+        COMMANDS[cmd.lowercase()]!!.exec(tokens, computer)
+      } else {
+        tokens.reset()
+        val asm = mutableListOf<MTMCToken>()
+        asm.addAll(tokens.tokens)
+        val updatedAsm = Assembler.transformSyntheticInstructions(asm)
+        val firstToken = updatedAsm.peekFirst()
+        val firstTokenStr = firstToken?.stringValue() ?: error("Unexpected null token")
+        if (!updatedAsm.isEmpty() && isInstruction(firstTokenStr)) {
+          val assembler = Assembler()
+          val result = assembler.assemble(command)
+          if (result.errors.isEmpty()) {
+            val code = result.code
+            if (code.size == 4) {
+              val data = (code[2].toInt() shl 8) or code[3].toInt()
+              computer.setRegisterValue(Register.DR, data)
             }
-            if (isCommand(cmd)) {
+            val lower = code[1].toInt() and 0xFF
-                COMMANDS.get(cmd.toLowerCase()).exec(tokens, computer);
+            val higher = code[0].toInt() and 0xFF
-            } else {
+            val inst = (higher shl 8) or lower
-                tokens.reset();
+            val originalDebugInfo = computer.debugInfo
-                LinkedList<MTMCToken> asm = new LinkedList<>(tokens.stream().toList());
+            computer.debugInfo = result.debugInfo
-                LinkedList<MTMCToken> updatedAsm = Assembler.Companion.transformSyntheticInstructions(asm);
+            computer.execInstruction(inst.toShort())
-                MTMCToken firstToken = updatedAsm.peekFirst();
+            computer.debugInfo = originalDebugInfo
-                String firstTokenStr = firstToken.stringValue();
+          } else {
-                if (!updatedAsm.isEmpty() && Instruction.isInstruction(firstTokenStr)) {
+            computer.console.println(result.printErrors())
-                    Assembler assembler = new Assembler();
+          }
-                    AssemblyResult result = assembler.assemble(command);
+        } else {
-                    if (result.errors.isEmpty()) {
+          if (findExecutable(cmd, computer.fileSystem)) {
-                        byte[] code = result.code;
+            runExecutable(cmd, command, tokens, computer)
-                        if (code.length == 4) {
+          } else {
-                            int data = (code[2] << 8) | code[3];
+            printShellHelp(computer)
-                            computer.setRegisterValue(Register.DR, data);
+          }
-                        }
-                        int lower = code[1] & 0xFF;
-                        int higher = code[0] & 0xFF;
-                        int inst = (higher << 8) | lower;
-                        DebugInfo originalDebugInfo = computer.getDebugInfo();
-                        computer.setDebugInfo(result.debugInfo);
-                        computer.execInstruction((short) inst);
-                        computer.setDebugInfo(originalDebugInfo);
-                    } else {
-                        computer.getConsole().println(result.printErrors());
-                    }
-                } else {
-                    if (findExecutable(cmd, computer.getFileSystem())) {
-                        runExecutable(cmd, command, tokens, computer);
-                    } else {
-                        printShellHelp(computer);
-                    }
-                }
-            }
-        } catch (NoSuchFileException e) {
-            computer.getConsole().println("No such file: " + e.getFile());
-        } catch (Exception e) {
-            computer.getConsole().println(e.getMessage());
-            e.printStackTrace();
         }
+      }
+      /*
+          } catch (e: NoSuchFileException) {
+            computer.console.println("No such file: " + e.getFile())
+      */
+    } catch (e: Exception) {
+      computer.console.println(e.message!!)
+      e.printStackTrace()
     }
+  }
 
-    public static void printShellHelp(MonTanaMiniComputer computer) {
+  fun printShellHelp(computer: MonTanaMiniComputer) {
-        computer.getConsole().println("Shell BuiltIns: \n");
+    computer.console.println("Shell BuiltIns: \n")
-        for (ShellCommand value : COMMANDS.values()) {
+    for (value in COMMANDS.values) {
-            computer.getConsole().println(value.help);
+      computer.console.println(value.help!!)
-        }
-        computer.getConsole().println("Also: ");
-        computer.getConsole().println("   <asm instruction>");
-        computer.getConsole().println("or \n" +
-                "  <executable>\n\n");
     }
+    computer.console.println("Also: ")
+    computer.console.println("   <asm instruction>")
+    computer.console.println(
+      "or \n" +
+          "  <executable>\n\n"
+    )
+  }
 
-    public static void printShellWelcome(MonTanaMiniComputer computer) {
+  fun printShellWelcome(computer: MonTanaMiniComputer) {
-        computer.getConsole().println("Welcome to MtOS!  Type ? for help");
+    computer.console.println("Welcome to MtOS!  Type ? for help")
-    }
+  }
 }

src/commonMain/kotlin/mtmc/os/shell/UsageException.kt

@@ -1,12 +1,7 @@
-package mtmc.os.shell;
+package mtmc.os.shell
 
-public class UsageException extends RuntimeException {
+class UsageException(
-    private final ShellCommand cmd;
+  cmd: ShellCommand
-    public UsageException(ShellCommand shellCommand) {
+) : RuntimeException(
-        super("Usage:\n\n" + shellCommand.help);
+  "Usage:\n\n" + cmd.help
-        this.cmd = shellCommand;
+)
-    }
-    public ShellCommand getCmd() {
-        return cmd;
-    }
-}

src/commonMain/kotlin/mtmc/os/shell/builtins/AssembleCommand.kt

@@ -0,0 +1,45 @@
+package mtmc.os.shell.builtins
+
+import mtmc.emulator.MonTanaMiniComputer
+import mtmc.os.shell.ShellCommand
+import mtmc.tokenizer.MTMCTokenizer
+
+class AssembleCommand : ShellCommand() {
+  @Throws(Exception::class)
+  public override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
+    val fs = computer.fileSystem
+    val src = tokens.collapseTokensAsString()
+    require(!(src == null || src.isBlank())) { "missing or required argument 'src'" }
+    /*
+        val srcPath: Path = getDiskPath(src, fs)
+
+        val dst = tokens.collapseTokensAsString()
+        require(!(dst == null || dst.isBlank())) { "missing required argument 'dst'" }
+        val dstPath: Path = getDiskPath(dst, fs)
+
+        val contents = Files.readString(srcPath)
+        val assembler = Assembler()
+        val file_name =
+          fs.resolve(src) // srcPath.toString().substring(DISK_PATH.toString().length()).replaceAll("\\\\", "/");
+        val executable = assembler.assembleExecutable(file_name, contents)
+        executable.dump(dstPath)
+        computer.notifyOfFileSystemUpdate()
+    */
+  }
+
+  override val help: String
+    get() = """
+                asm <src> <dst>
+                    - src : path to a .asm file
+                    - dst : path to a target output binary
+                    """.trimIndent()
+
+  companion object {
+    /*
+        fun getDiskPath(pathString: String, fs: FileSystem): Path {
+          val path = Path.of("disk" + fs.resolve(pathString))
+          return path.toAbsolutePath()
+        }
+    */
+  }
+}

src/commonMain/kotlin/mtmc/os/shell/builtins/DisplayCommand.kt

@@ -2,15 +2,14 @@ package mtmc.os.shell.builtins
 
 import mtmc.emulator.MTMCDisplay
 import mtmc.emulator.MonTanaMiniComputer
+import mtmc.os.fs.File
 import mtmc.os.shell.ShellCommand
 import mtmc.tokenizer.MTMCToken
 import mtmc.tokenizer.MTMCTokenizer
-import java.io.File
+import kotlin.random.Random
-import java.util.*
-import javax.imageio.ImageIO
 
 class DisplayCommand : ShellCommand() {
-  var random: Random = Random()
+  var random: Random = Random.Default
 
   @Throws(Exception::class)
   public override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
@@ -42,8 +41,8 @@ class DisplayCommand : ShellCommand() {
           if (tokens.more()) {
             val imagePath = tokens.collapseTokensAsString()
             val file = computer.oS.loadFile(imagePath)
-            val img = ImageIO.read(file)
+            //val img = ImageIO.read(file)
-            computer.display.loadScaledImage(img)
+            //computer.display.loadScaledImage(img)
           } else {
             usageException()
           }
@@ -54,11 +53,15 @@ class DisplayCommand : ShellCommand() {
     } else if (tokens.match(MTMCToken.TokenType.INTEGER)) {
       val row = tokens.consumeAsInteger()
       val col = tokens.require(
-        mtmc.tokenizer.MTMCToken.TokenType.INTEGER,
+        mtmc.tokenizer.MTMCToken.TokenType.INTEGER
-        java.lang.Runnable { this.usageException() })!!.intValue()
+      ) {
+        this.usageException()
+      }!!.intValue()
       val color = tokens.require(
-        mtmc.tokenizer.MTMCToken.TokenType.INTEGER,
+        mtmc.tokenizer.MTMCToken.TokenType.INTEGER
-        java.lang.Runnable { this.usageException() })!!.intValue()
+      ) {
+        this.usageException()
+      }!!.intValue()
       computer.display.setPixel(row, col, color)
     } else {
       usageException()

src/commonMain/kotlin/mtmc/os/shell/builtins/ExitCommand.kt

@@ -7,7 +7,7 @@ import mtmc.tokenizer.MTMCTokenizer
 class ExitCommand : ShellCommand() {
   public override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
     computer.console.println("Goodbye!")
-    System.exit(1)
+    //System.exit(1)
   }
 
   override val help: String

src/commonMain/kotlin/mtmc/os/shell/builtins/LoadCommand.kt

@@ -3,13 +3,13 @@ package mtmc.os.shell.builtins
 import mtmc.emulator.MonTanaMiniComputer
 import mtmc.os.exec.Executable.Companion.load
 import mtmc.os.fs.FileSystem
+import mtmc.os.fs.Path
 import mtmc.os.shell.ShellCommand
 import mtmc.tokenizer.MTMCTokenizer
-import java.nio.file.Path
 
 class LoadCommand : ShellCommand() {
   @Throws(Exception::class)
-  public override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
+  override fun exec(tokens: MTMCTokenizer, computer: MonTanaMiniComputer) {
     val fs = computer.fileSystem
     val program = tokens.collapseTokensAsString()
     require(!(program == null || program.isBlank())) { "missing or required argument 'src'" }

src/commonMain/kotlin/mtmc/os/shell/builtins/SeacCommand.kt

@@ -1,10 +1,8 @@
 package mtmc.os.shell.builtins
 
 import mtmc.emulator.MonTanaMiniComputer
-import mtmc.lang.sea.SeaLanguage
 import mtmc.os.shell.ShellCommand
 import mtmc.tokenizer.MTMCTokenizer
-import mtmc.util.StringEscapeUtils.escapeString
 
 class SeacCommand : ShellCommand() {
   @Throws(Exception::class)
@@ -24,15 +22,18 @@ class SeacCommand : ShellCommand() {
 
     requireNotNull(filename) { "expected source file" }
 
-    require(fs.exists(filename)) { "file " + escapeString(filename) + " does not exist" }
+    require(fs.exists(filename)) { "file " + filename + " does not exist" }
     println(fs.resolve(filename))
-    val lang = SeaLanguage()
-    val content = fs.readFile(filename)
-    val exec = lang.compileExecutable(fs.resolve(filename), content)
 
-    val bin = exec.dump()
+    /*
-    computer.fileSystem.writeFile(output, bin)
+        val lang = SeaLanguage()
-    computer.notifyOfFileSystemUpdate()
+        val content = fs.readFile(filename)
+        val exec = lang.compileExecutable(fs.resolve(filename), content)
+
+        val bin = exec.dump()
+        computer.fileSystem.writeFile(output, bin)
+        computer.notifyOfFileSystemUpdate()
+    */
   }
 
   override val help: String

src/commonMain/kotlin/mtmc/os/shell/builtins/SetCommand.kt

@@ -40,7 +40,10 @@ class SetCommand : ShellCommand() {
       if (value?.type === MTMCToken.TokenType.INTEGER || value?.type === MTMCToken.TokenType.BINARY || value?.type === MTMCToken.TokenType.HEX) {
         computer.writeWordToMemory(memLocation.intValue(), value.intValue())
       } else {
-        computer.writeStringToMemory(memLocation.intValue(), value!!.stringValue().toByteArray())
+        computer.writeStringToMemory(
+          memLocation.intValue(),
+          value!!.stringValue().encodeToByteArray()
+        )
       }
     }
   }

src/commonMain/kotlin/mtmc/os/shell/builtins/SpeedCommand.kt

@@ -4,13 +4,10 @@ import mtmc.emulator.MonTanaMiniComputer
 import mtmc.os.shell.ShellCommand
 import mtmc.tokenizer.MTMCToken
 import mtmc.tokenizer.MTMCTokenizer
-import java.util.*
 
 class SpeedCommand : ShellCommand() {
-  private val speeds: MutableList<Int?> = Arrays.asList<Int?>(
+  private val speeds = listOf(
-    *arrayOf<Int>(
       1, 10, 100, 1000, 10000, 100000, 1000000
-    )
   )
 
   @Throws(Exception::class)

src/commonMain/kotlin/mtmc/tokenizer/MTMCScanner.kt

@@ -1,14 +1,16 @@
 package mtmc.tokenizer
 
-import java.util.*
+fun Char.isHexDigit(): Boolean {
+  return this in '0'..'9' || this in 'a'..'f' || this in 'A'..'F'
+}
 
 class MTMCScanner(private val src: String, private val lineCommentStart: String) {
   var position: Int = 0
   var line: Int = 1
   var lineOffset: Int = 0
-  var tokens: LinkedList<MTMCToken> = LinkedList<MTMCToken>()
+  var tokens = mutableListOf<MTMCToken>()
 
-  fun tokenize(): LinkedList<MTMCToken> {
+  fun tokenize(): MutableList<MTMCToken> {
     consumeWhitespace()
     while (!scanEnd()) {
       scanToken()
@@ -38,7 +40,7 @@ class MTMCScanner(private val src: String, private val lineCommentStart: String)
   }
 
   private fun scanLineComment(): Boolean {
-    val bytes = lineCommentStart.toByteArray()
+    val bytes = lineCommentStart.encodeToByteArray()
     for (i in bytes.indices) {
       val aChar = bytes[i]
       if (peek(i).code.toByte() != aChar) {
@@ -188,7 +190,7 @@ class MTMCScanner(private val src: String, private val lineCommentStart: String)
   private fun scanHex(start: Int): Boolean {
     takeChar() // take leading zero
     takeChar() // take 'x'
-    while (HexFormat.isHexDigit(peek().code)) {
+    while (peek().isHexDigit()) {
       takeChar()
     }
     tokens.add(makeToken(MTMCToken.TokenType.HEX, strValueFrom(start), start))

src/commonMain/kotlin/mtmc/tokenizer/MTMCToken.kt

@@ -1,13 +1,12 @@
 package mtmc.tokenizer
 
-@JvmRecord
 data class MTMCToken(
-  @JvmField val start: Int,
+  val start: Int,
-  @JvmField val end: Int,
+  val end: Int,
   val line: Int,
   val lineOffset: Int,
-  @JvmField val stringValue: String,
+  val stringValue: String,
-  @JvmField val type: TokenType?
+  val type: TokenType?
 ) {
   override fun toString(): String {
     return stringValue

src/commonMain/kotlin/mtmc/tokenizer/MTMCTokenizer.kt

@@ -1,11 +1,10 @@
 package mtmc.tokenizer
 
-import java.util.*
+import mtmc.util.Runnable
-import java.util.stream.Stream
 import kotlin.math.max
 
 class MTMCTokenizer(var source: String, lineCommentStart: String) {
-  var tokens: LinkedList<MTMCToken> = MTMCScanner(source, lineCommentStart).tokenize()
+  var tokens: MutableList<MTMCToken> = MTMCScanner(source, lineCommentStart).tokenize()
   var currentToken: Int = 0
 
   fun currentToken(): MTMCToken {
@@ -59,10 +58,6 @@ class MTMCTokenizer(var source: String, lineCommentStart: String) {
     return tokens.get(max(0, currentToken - 1))
   }
 
-  fun stream(): Stream<MTMCToken?> {
-    return tokens.stream()
-  }
-
   override fun toString(): String {
     val sb = StringBuilder()
     for (i in tokens.indices) {
@@ -104,7 +99,7 @@ class MTMCTokenizer(var source: String, lineCommentStart: String) {
     if (match(tokenType)) {
       return consume()
     } else {
-      notFound.run()
+      notFound.invoke()
       return null
     }
   }

src/commonMain/kotlin/mtmc/util/BinaryUtils.kt

@@ -22,27 +22,21 @@ object BinaryUtils {
   }
 
   fun toBinary(aByte: Byte): String {
-    val binaryString = Integer.toBinaryString(aByte.toInt())
+    val zeroed = aByte.toInt().toString(2).padStart(8, '0')
-    val formatted = String.format("%8s", binaryString)
-    val zeroed = formatted.replace(" ".toRegex(), "0")
     val underScored = zeroed.replace("....".toRegex(), "$0_")
     val noTrailingUnderscore = underScored.substring(0, underScored.length - 1)
     return "0b" + noTrailingUnderscore
   }
 
   fun toBinary(aShort: Short): String {
-    val binaryString = Integer.toBinaryString(aShort.toInt())
+    val zeroed = aShort.toInt().toString(2).padStart(16, '0')
-    val formatted = String.format("%16s", binaryString)
-    val zeroed = formatted.replace(" ".toRegex(), "0")
     val underScored = zeroed.replace("....".toRegex(), "$0_")
     val noTrailingUnderscore = underScored.substring(0, underScored.length - 1)
     return "0b" + noTrailingUnderscore
   }
 
   fun toBinary(anInt: Int): String {
-    val binaryString = Integer.toBinaryString(anInt)
+    val zeroed = anInt.toString(2).padStart(32, '0')
-    val formatted = String.format("%32s", binaryString)
-    val zeroed = formatted.replace(" ".toRegex(), "0")
     val underScored = zeroed.replace("....".toRegex(), "$0_")
     val noTrailingUnderscore = underScored.substring(0, underScored.length - 1)
     return "0b" + noTrailingUnderscore

src/commonMain/kotlin/mtmc/util/PlatformSpecific.kt

@@ -0,0 +1,3 @@
+package mtmc.util
+
+expect fun currentTimeMillis(): Long

src/commonMain/kotlin/mtmc/util/Runnable.kt

@@ -0,0 +1,3 @@
+package mtmc.util
+
+typealias Runnable = () -> Unit

src/jsMain/kotlin/mtmc/util/PlatformSpecific.js.kt

@@ -0,0 +1,5 @@
+package mtmc.util
+
+import kotlin.js.Date
+
+actual fun currentTimeMillis(): Long = Date().getTime().toLong()