add menu entry to allow to switch the emulated machine type

src/main/java/com/loomcom/symon/Main.java

@@ -40,9 +40,9 @@ public class Main {
      *
      * @param args
      */
-    public static void main(String args[]) {
+    public static void main(String args[]) throws Exception {
         
-        Class machineClass = null;
+        Class machineClass = SymonMachine.class;
         for(int i = 0; i < args.length; ++i) {
             String arg = args[i].toLowerCase(Locale.ENGLISH);
             if(arg.equals("-machine") && (i+1) < args.length) {
@@ -55,6 +55,7 @@ public class Main {
             }
         }
         
+        while(true) {        
             if(machineClass == null) {
                 Object[] possibilities = {"Symon", "Multicomp"};
                 String s = (String)JOptionPane.showInputDialog(
@@ -72,14 +73,13 @@ public class Main {
                 }
             }
         
+            final Simulator simulator = new Simulator(machineClass);
         
-        final Class mClass = machineClass;
             SwingUtilities.invokeLater(new Runnable() {
                 public void run() {
                     try {
                         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                         // Create the main UI window
-                    Simulator simulator = new Simulator(mClass);
                         simulator.createAndShowUi();
                     } catch (Exception e) {
                         e.printStackTrace();
@@ -88,6 +88,14 @@ public class Main {
             });
         
         
+            Simulator.MAIN_CMD cmd = simulator.waitForCommand();
+            if(cmd.equals(Simulator.MAIN_CMD.SELECTMACHINE)) {
+                machineClass = null;
+            } else {
+                break;
+            }
+        }
+       
     }
     
 }

src/main/java/com/loomcom/symon/Simulator.java

@@ -116,6 +116,13 @@ public class Simulator {
     private JFileChooser      fileChooser;
     private PreferencesDialog preferences;
 
+    private final Object commandMonitorObject = new Object();
+    private MAIN_CMD command = MAIN_CMD.NONE;
+    public static enum MAIN_CMD  {
+        NONE,
+        SELECTMACHINE
+    }
+    
     /**
      * The list of step counts that will appear in the "Step" drop-down.
      */
@@ -231,6 +238,18 @@ public class Simulator {
         handleReset();
     }
     
+    public MAIN_CMD waitForCommand() {
+        synchronized(commandMonitorObject) {
+            try {
+                commandMonitorObject.wait();
+            } catch (InterruptedException ex) {
+                ex.printStackTrace();
+            }
+        }
+        return command;
+    }
+    
+
     private void handleStart() {
         // Shift focus to the console.
         console.requestFocus();
@@ -544,6 +563,34 @@ public class Simulator {
         }
     }
     
+    class SelectMachineAction extends AbstractAction {
+        Simulator simulator;
+        
+        public SelectMachineAction() {
+            super("Switch emulated machine...", null);
+            putValue(SHORT_DESCRIPTION, "Select the type of the machine to be emulated");
+            putValue(MNEMONIC_KEY, KeyEvent.VK_M);
+        }
+
+        public void actionPerformed(ActionEvent actionEvent) {
+            if(runLoop != null) {
+                runLoop.requestStop();
+            }
+
+            memoryWindow.dispose();
+            traceLog.dispose();
+            if(videoWindow != null) {
+                videoWindow.dispose();
+            }
+            mainWindow.dispose();
+
+            command = MAIN_CMD.SELECTMACHINE;
+            synchronized(commandMonitorObject) {
+                commandMonitorObject.notifyAll();
+            }
+        }
+    }
+
     class QuitAction extends AbstractAction {
         public QuitAction() {
             super("Quit", null);
@@ -669,11 +716,13 @@ public class Simulator {
             loadProgramItem = new JMenuItem(new LoadProgramAction());
             loadRomItem = new JMenuItem(new LoadRomAction());
             JMenuItem prefsItem = new JMenuItem(new ShowPrefsAction());
+            JMenuItem selectMachineItem = new JMenuItem(new SelectMachineAction());
             JMenuItem quitItem = new JMenuItem(new QuitAction());
 
             fileMenu.add(loadProgramItem);
             fileMenu.add(loadRomItem);
             fileMenu.add(prefsItem);
+            fileMenu.add(selectMachineItem);
             fileMenu.add(quitItem);
 
             add(fileMenu);