Add Mike42 Machine Type

README.md

@@ -1,9 +1,9 @@
-SYMON - A 6502 System Simulator
+kSYMON - A 6502 System Simulator
 ===============================
 
-**Version:** 1.5.0
+**Version:** 1.5.1k
 
-**Last Updated:** 30 March, 2025
+**Last Updated:** 24 September, 2026
 
 See the file COPYING for license.
 
@@ -71,6 +71,13 @@ memory.
   - `$6000`--`$600F`: 6522 VIA
   - `$8000`--`$FFFF`: 16KB ROM
 
+#### 3.1.5 Mike42 Memory Map
+
+  - `$0000`--`$7FFF`: 32KB RAM
+  - `$8000`--`$800F`: 6522 VIA
+  - `$8400`--`$8403`: MOS 6551 ACIA (Serial Console)
+  - `$C000`--`$FFFF`: 16KB ROM
+
 ### 3.2 Serial Console and CPU Status
 
 ![Serial Console](https://codeberg.org/sethm/symon/raw/master/screenshots/console.png)

pom.xml

@@ -5,7 +5,7 @@
     <groupId>com.loomcom.symon</groupId>
     <artifactId>symon</artifactId>
     <packaging>jar</packaging>
-    <version>1.5.0</version>
+    <version>1.5.1k</version>
     <name>symon</name>
     <url>https://git.loomcom.com/seth/symon</url>
     <properties>
@@ -26,7 +26,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.5.16</version>
+            <version>1.5.34</version>
         </dependency>
         <dependency>
             <groupId>commons-cli</groupId>
@@ -55,6 +55,11 @@
             <version>4.11.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>net.java.dev.jna</groupId>
+            <artifactId>jna</artifactId>
+            <version>5.14.0</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -66,7 +71,7 @@
                 <configuration>
                     <transformers>
                         <transformer
-                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                             <mainClass>com.loomcom.symon.Main</mainClass>
                         </transformer>
                     </transformers>
@@ -97,8 +102,8 @@
                 <version>3.7.0</version>
                 <configuration>
                     <compilerArgument>-Xlint:unchecked</compilerArgument>
-                    <source>11</source>
-                    <target>11</target>
+                    <source>16</source>
+                    <target>16</target>
                 </configuration>
             </plugin>
 

src/main/java/com/loomcom/symon/machines/MichaelBillingtonMachine.java

@@ -0,0 +1,134 @@
+package com.loomcom.symon.machines;
+
+import com.loomcom.symon.Bus;
+import com.loomcom.symon.Cpu;
+import com.loomcom.symon.InstructionTable;
+import com.loomcom.symon.devices.*;
+import com.loomcom.symon.exceptions.MemoryRangeException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+
+public class MichaelBillingtonMachine implements Machine{
+
+    private static final Logger logger = LoggerFactory.getLogger(MichaelBillingtonMachine.class.getName());
+
+    // Constants used by the simulated system
+    private static final int BUS_BOTTOM = 0x0000;
+    private static final int BUS_TOP    = 0xffff;
+
+    // 32k of ram, from $0000 to $7fff
+    private static final int MEMORY_BASE = 0x0000;
+    private static final int MEMORY_SIZE = 0x8000;
+
+    // VIA at $8000-$800f
+    private static final int PIA_BASE = 0x8000;
+
+    // ACIA at $8400-$8403
+    private static final int ACIA_BASE = 0x8400;
+
+    // 16k ROM from $c000 to $ffff
+    private static final int ROM_BASE = 0xc000;
+    private static final int ROM_SIZE = 0x4000;
+
+    private final   Bus     bus;
+    private final   Cpu     cpu;
+    private final   Acia    acia;
+    private final   Pia     pia;
+    private final   Memory  ram;
+    private         Memory  rom;
+
+    public MichaelBillingtonMachine(String romFile) throws Exception {
+        this.bus = new Bus(BUS_BOTTOM, BUS_TOP);
+        this.cpu = new Cpu();
+        this.ram = new Memory(MEMORY_BASE, MEMORY_BASE + MEMORY_SIZE - 1);
+        this.pia = new Via6522(PIA_BASE);
+        this.acia = new Acia6551(ACIA_BASE);
+
+        bus.addCpu(cpu);
+        bus.addDevice(ram);
+        bus.addDevice(pia);
+        bus.addDevice(acia);
+
+        if (romFile != null) {
+            File romImage = new File(romFile);
+            if (romImage.canRead()) {
+                logger.info("Loading ROM image from file {}", romImage);
+                this.rom = Memory.makeROM(ROM_BASE, ROM_BASE + ROM_SIZE - 1, romImage);
+            } else {
+                logger.info("Default ROM file {} not found, loading empty R/W memory image.", romImage);
+                this.rom = Memory.makeRAM(ROM_BASE, ROM_BASE + ROM_SIZE - 1);
+            }
+        } else {
+            logger.info("No ROM file specified, loading empty R/W memory image.");
+            this.rom = Memory.makeRAM(ROM_BASE, ROM_BASE + ROM_SIZE - 1);
+        }
+
+        bus.addDevice(rom);
+    }
+
+    @Override
+    public Bus getBus() {
+        return bus;
+    }
+
+    @Override
+    public Cpu getCpu() {
+        return cpu;
+    }
+
+    @Override
+    public Memory getRam() {
+        return ram;
+    }
+
+    @Override
+    public Acia getAcia() {
+        return acia;
+    }
+
+    @Override
+    public Pia getPia() {
+        return pia;
+    }
+
+    @Override
+    public Crtc getCrtc() {
+        return null;
+    }
+
+    @Override
+    public Memory getRom() {
+        return rom;
+    }
+
+    @Override
+    public void setRom(Memory rom) throws MemoryRangeException {
+        if (this.rom != null) {
+            bus.removeDevice(this.rom);
+        }
+        this.rom = rom;
+        bus.addDevice(this.rom);
+    }
+
+    @Override
+    public int getRomBase() {
+        return ROM_BASE;
+    }
+
+    @Override
+    public int getRomSize() {
+        return ROM_SIZE;
+    }
+
+    @Override
+    public int getMemorySize() {
+        return MEMORY_SIZE;
+    }
+
+    @Override
+    public String getName() {
+        return "mike42";
+    }
+}

src/main/java/com/loomcom/symon/ui/Ui.java

@@ -30,6 +30,7 @@ import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
 
+import com.loomcom.symon.machines.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -84,7 +85,7 @@ public final class Ui {
     }
 
     public static Class<?> showMachineSelectionDialog() {
-        Object[] possibilities = { "Symon", "Multicomp", "Simple", "BenEater" };
+        Object[] possibilities = { "Symon", "Multicomp", "Simple", "BenEater", "Mike42" };
         String s = (String) JOptionPane.showInputDialog(
                 null,
                 "Please choose the machine type to be emulated:",
@@ -100,6 +101,8 @@ public final class Ui {
             return SimpleMachine.class;
         } else if (s != null && s.equals("BenEater")) {
             return BenEaterMachine.class;
+        } else if (s != null && s.equals("Mike42")) {
+            return MichaelBillingtonMachine.class;
         } else {
             return SymonMachine.class;
         }