Fixes and enhancements.

- Added ability to change inner border width of console window.
- Fixed a nasty bug that prevented key press handling.
- Reset now clears the accumulator and index registers.

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

@@ -118,6 +118,11 @@ public class Cpu implements InstructionTable {
 
         // Reset step counter
         stepCounter = 0L;
+
+        // Reset registers.
+        a = 0;
+        x = 0;
+        y = 0;
     }
 
     public void step(int num) throws MemoryAccessException {

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

@@ -8,11 +8,15 @@ public interface Preferences {
 
     public static final int DEFAULT_ACIA_ADDRESS = 0xc000;
 
+    public static final int DEFAULT_BORDER_WIDTH = 10;
+
     public JDialog getDialog();
 
     public int getProgramStartAddress();
 
     public int getAciaAddress();
 
+    public int getBorderWidth();
+
     public void updateUi();
 }

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

@@ -73,7 +73,7 @@ public class Simulator implements ActionListener, Observer {
     private JMenuItem    loadMenuItem;
 
     private JFileChooser fileChooser;
-    private Preferences  preferences;
+    private PreferencesDialog  preferences;
 
     public Simulator() throws MemoryRangeException {
         this.acia = new Acia(ACIA_BASE);
@@ -109,6 +109,7 @@ public class Simulator implements ActionListener, Observer {
         // File Chooser
         fileChooser = new JFileChooser();
         preferences = new PreferencesDialog(mainWindow, true);
+        preferences.addObserver(this);
 
         // Panel for Console and Buttons
         JPanel controlsContainer = new JPanel();
@@ -203,6 +204,8 @@ public class Simulator implements ActionListener, Observer {
         } else if (actionEvent.getSource() == stepButton) {
             handleStep();
         } else if (actionEvent.getSource() == runStopButton) {
+            // Shift focus to the console.
+            console.requestFocus();
             if (runLoop != null && runLoop.isRunning()) {
                 runLoop.requestStop();
                 runLoop.interrupt();
@@ -327,18 +330,9 @@ public class Simulator implements ActionListener, Observer {
         // Read from the ACIA and immediately update the console if there's
         // output ready.
         if (acia.hasTxChar()) {
-            try {
-                SwingUtilities.invokeAndWait(new Runnable() {
-                    public void run() {
-                        console.print(Character.toString((char)acia.txRead()));
-                        console.repaint();
-                    }
-                });
-            } catch (InvocationTargetException e) {
-                e.printStackTrace();
-            } catch (InterruptedException e) {
-                e.printStackTrace();
-            }
+            // This is thread-safe
+            console.print(Character.toString((char)acia.txRead()));
+            console.repaint();
         }
 
         // If a key has been pressed, fill the ACIA.
@@ -414,8 +408,14 @@ public class Simulator implements ActionListener, Observer {
     public void update(Observable observable, Object o) {
         // Instance equality should work here, there is only one instance.
         if (observable == preferences) {
-            // TODO: Update system based on state. (i.e., update ACIA address, and raise a dialog if it
-            // overlaps with anything)
+            // TODO: Update ACIA base address if it has changed.
+
+            int oldBorderWidth = console.getBorderWidth();
+            if (oldBorderWidth != preferences.getBorderWidth()) {
+                // Resize the main window if the border width has changed.
+                console.setBorderWidth(preferences.getBorderWidth());
+                mainWindow.pack();
+            }
         }
     }
 

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

@@ -6,6 +6,7 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 
 import com.grahamedgecombe.jterminal.JTerminal;
+import com.grahamedgecombe.jterminal.vt100.Vt100TerminalModel;
 
 import javax.swing.*;
 import javax.swing.border.BevelBorder;
@@ -18,11 +19,20 @@ import javax.swing.border.Border;
 
 public class Console extends JTerminal implements KeyListener, MouseListener {
 
+    private static final int DEFAULT_COLUMNS = 80;
+    private static final int DEFAULT_ROWS = 24;
+    private static final int DEFAULT_BORDER_WIDTH = 10;
+
     private boolean hasInput = false;
     private char keyBuffer;
 
-	public Console() {
-        super();
+    public Console() {
+        this(DEFAULT_COLUMNS, DEFAULT_ROWS);
+    }
+
+	public Console(int columns, int rows) {
+        super(new Vt100TerminalModel(columns, rows));
+        setBorderWidth(DEFAULT_BORDER_WIDTH);
         addKeyListener(this);
         addMouseListener(this);
         Border emptyBorder = BorderFactory.createEmptyBorder(5, 5, 5, 0);
@@ -31,6 +41,11 @@ public class Console extends JTerminal implements KeyListener, MouseListener {
         this.setBorder(compoundBorder);
 	}
 
+    /**
+     * Reset the console. This will cause the console to be cleared and the cursor returned to the
+     * home position.
+     *
+     */
     public void reset() {
         getModel().clear();
         getModel().setCursorColumn(0);
@@ -39,28 +54,50 @@ public class Console extends JTerminal implements KeyListener, MouseListener {
         this.hasInput = false;
     }
 
-    public void keyTyped(KeyEvent keyEvent) {
-        keyEvent.consume();
-    }
-
-    public void keyPressed(KeyEvent keyEvent) {
-        keyBuffer = keyEvent.getKeyChar();
-        hasInput = true;
-
-        System.out.println("Key Pressed (0x" + Integer.toString((int)keyBuffer, 16) + ") : " + keyBuffer);
-
-        keyEvent.consume();
-    }
-
+    /**
+     * Returns true if a key has been pressed since the last time input was read.
+     *
+     * @return
+     */
     public boolean hasInput() {
         return hasInput;
     }
 
+    /**
+     * Handle a Key Typed event.
+     *
+     * @param keyEvent The key event.
+     */
+    public void keyTyped(KeyEvent keyEvent) {
+        keyEvent.consume();
+    }
+
+    /**
+     * Handle a Key Press event.
+     *
+     * @param keyEvent The key event.
+     */
+    public void keyPressed(KeyEvent keyEvent) {
+        keyBuffer = keyEvent.getKeyChar();
+        hasInput = true;
+        keyEvent.consume();
+    }
+
+    /**
+     * Read the most recently typed key from the single-char input buffer.
+     *
+     * @return The character typed.
+     */
     public char readInputChar() {
         hasInput = false;
         return this.keyBuffer;
     }
 
+    /**
+     * Handle a key release event.
+     *
+     * @param keyEvent The key event.
+     */
     public void keyReleased(KeyEvent keyEvent) {
         keyEvent.consume();
     }

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

@@ -14,9 +14,11 @@ public class PreferencesDialog extends Observable implements Preferences {
 
     private JTextField aciaAddressField;
     private JTextField programLoadAddressField;
+    private JTextField borderWidthField;
 
     private int programLoadAddress = DEFAULT_PROGRAM_LOAD_ADDRESS;
     private int aciaAddress = DEFAULT_ACIA_ADDRESS;
+    private int borderWidth = DEFAULT_BORDER_WIDTH;
 
     public PreferencesDialog(Frame parent, boolean modal) {
         this.dialog = new JDialog(parent, modal);
@@ -28,6 +30,9 @@ public class PreferencesDialog extends Observable implements Preferences {
         return dialog;
     }
 
+    /**
+     * TODO: Validation of input.
+     */
     private void initComponents() {
         dialog.setTitle("Preferences");
         Container contents = dialog.getContentPane();
@@ -40,12 +45,15 @@ public class PreferencesDialog extends Observable implements Preferences {
 
         final JLabel aciaAddressLabel = new JLabel("ACIA Address");
         final JLabel programLoadAddressLabel = new JLabel("Program Load Address");
+        final JLabel borderWidthLabel = new JLabel("Console Border Width");
 
         aciaAddressField = new JTextField(8);
         programLoadAddressField = new JTextField(8);
+        borderWidthField = new JTextField(8);
 
         aciaAddressLabel.setLabelFor(aciaAddressField);
         programLoadAddressLabel.setLabelFor(programLoadAddressField);
+        borderWidthLabel.setLabelFor(borderWidthField);
 
         GridBagConstraints constraints = new GridBagConstraints();
 
@@ -66,6 +74,13 @@ public class PreferencesDialog extends Observable implements Preferences {
         constraints.gridx = 1;
         settingsContainer.add(programLoadAddressField, constraints);
 
+        constraints.gridy = 2;
+        constraints.gridx = 0;
+        settingsContainer.add(borderWidthLabel, constraints);
+
+        constraints.gridx = 1;
+        settingsContainer.add(borderWidthField, constraints);
+
         JButton applyButton = new JButton("Apply");
         JButton cancelButton = new JButton("Cancel");
 
@@ -81,8 +96,11 @@ public class PreferencesDialog extends Observable implements Preferences {
             public void actionPerformed(ActionEvent actionEvent) {
                 programLoadAddress = hexToInt(programLoadAddressField.getText());
                 aciaAddress = hexToInt(aciaAddressField.getText());
+                borderWidth = Integer.parseInt(borderWidthField.getText());
                 updateUi();
-                notifyObservers();
+                // TODO: Actually check to see if values have changed, don't assume.
+                setChanged();
+                PreferencesDialog.this.notifyObservers();
                 dialog.setVisible(false);
             }
         });
@@ -96,6 +114,27 @@ public class PreferencesDialog extends Observable implements Preferences {
         dialog.pack();
     }
 
+    public int getProgramStartAddress() {
+        return programLoadAddress;
+    }
+
+    public int getAciaAddress() {
+        return aciaAddress;
+    }
+
+    /**
+     * @return The width of the console border, in pixels.
+     */
+    public int getBorderWidth() {
+        return borderWidth;
+    }
+
+    public void updateUi() {
+        aciaAddressField.setText(intToHex(aciaAddress));
+        programLoadAddressField.setText(intToHex(programLoadAddress));
+        borderWidthField.setText(Integer.toString(borderWidth));
+    }
+
     private String intToHex(int i) {
         return String.format("%04x", i);
     }
@@ -109,16 +148,4 @@ public class PreferencesDialog extends Observable implements Preferences {
         }
     }
 
-    public int getProgramStartAddress() {
-        return programLoadAddress;
-    }
-
-    public int getAciaAddress() {
-        return aciaAddress;
-    }
-
-    public void updateUi() {
-        aciaAddressField.setText(intToHex(aciaAddress));
-        programLoadAddressField.setText(intToHex(programLoadAddress));
-    }
 }