diff --git a/app/assembler.js b/app/assembler.js
index 4747f68..1dc0403 100644
--- a/app/assembler.js
+++ b/app/assembler.js
@@ -33,7 +33,7 @@ function SimulatorWidget(node) {
     $node.find('.runButton').click(simulator.runBinary);
     $node.find('.runButton').click(simulator.stopDebugger);
     $node.find('.resetButton').click(simulator.reset);
-    $node.find('.hexdumpButton').click(assembler.hexdump);
+    $node.find('.hexdumpButton').click(assembler.hexdump).trigger('keydown', {which: 65});
     $node.find('.disassembleButton').click(assembler.disassemble);
     $node.find('.debug').on('click', function () {
       $(this).toggleClass('active');
@@ -49,7 +49,7 @@ function SimulatorWidget(node) {
     $node.find('.monitoring').on('click', function () {
       $(this).toggleClass('active');
       if($(this).hasClass('active')) {
-        
+
       }
       ui.toggleMonitor();
       simulator.toggleMonitor();
@@ -177,10 +177,10 @@ function SimulatorWidget(node) {
 
         // Insert tab at caret position (instead of losing focus)
         var caretStart = this.selectionStart,
-            caretEnd   = this.selectionEnd,
-            currentValue = this.value;
+          caretEnd   = this.selectionEnd,
+          currentValue = this.value;
 
-        this.value = currentValue.substring(0, caretStart) + "\t" + currentValue.substring(caretEnd);
+        this.value = currentValue.substring(0, caretStart) + '\t' + currentValue.substring(caretEnd);
 
         // Move cursor forwards one (after tab)
         this.selectionStart = this.selectionEnd = caretStart + 1;
@@ -204,10 +204,10 @@ function SimulatorWidget(node) {
   function Display() {
     var displayArray = [];
     var palette = [
-      "#000000", "#ffffff", "#880000", "#aaffee",
-      "#cc44cc", "#00cc55", "#0000aa", "#eeee77",
-      "#dd8855", "#664400", "#ff7777", "#333333",
-      "#777777", "#aaff66", "#0088ff", "#bbbbbb"
+      '#000000', '#ffffff', '#880000', '#aaffee',
+      '#cc44cc', '#00cc55', '#0000aa', '#eeee77',
+      '#dd8855', '#664400', '#ff7777', '#333333',
+      '#777777', '#aaff66', '#0088ff', '#bbbbbb'
     ];
     var ctx;
     var width;
@@ -226,7 +226,7 @@ function SimulatorWidget(node) {
     }
 
     function reset() {
-      ctx.fillStyle = "black";
+      ctx.fillStyle = 'black';
       ctx.fillRect(0, 0, width, height);
     }
 
@@ -279,14 +279,14 @@ function SimulatorWidget(node) {
 
       for (var x = 0; x < length; x++) {
         if ((x & 15) === 0) {
-          if (x > 0) { html += "\n"; }
+          if (x > 0) { html += '\n'; }
           n = (start + x);
           html += num2hex(((n >> 8) & 0xff));
           html += num2hex((n & 0xff));
-          html += ": ";
+          html += ': ';
         }
         html += num2hex(memory.get(start + x));
-        html += " ";
+        html += ' ';
       }
       return html;
     }
@@ -871,7 +871,7 @@ function SimulatorWidget(node) {
 
       i58: function () {
         regP &= ~0x04;
-        throw new Error("Interrupts not implemented");
+        throw new Error('Interrupts not implemented');
         //CLI
       },
 
@@ -1006,7 +1006,7 @@ function SimulatorWidget(node) {
 
       i78: function () {
         regP |= 0x04;
-        throw new Error("Interrupts not implemented");
+        throw new Error('Interrupts not implemented');
         //SEI
       },
 
@@ -1499,7 +1499,7 @@ function SimulatorWidget(node) {
       },
 
       ierr: function () {
-        message("Address $" + addr2hex(regPC) + " - unknown opcode");
+        message('Address $' + addr2hex(regPC) + ' - unknown opcode');
         codeRunning = false;
       }
     };
@@ -1509,7 +1509,7 @@ function SimulatorWidget(node) {
       regSP--;
       if (regSP < 0) {
         regSP &= 0xff;
-        message("6502 Stack filled! Wrapping...");
+        message('6502 Stack filled! Wrapping...');
       }
     }
 
@@ -1518,7 +1518,7 @@ function SimulatorWidget(node) {
       regSP++;
       if (regSP >= 0x100) {
         regSP &= 0xff;
-        message("6502 Stack emptied! Wrapping...");
+        message('6502 Stack emptied! Wrapping...');
       }
       value = memory.get(regSP + 0x100);
       return value;
@@ -1582,7 +1582,7 @@ function SimulatorWidget(node) {
 
       if ((regPC === 0) || (!codeRunning && !debugging)) {
         stop();
-        message("Program end at PC=$" + addr2hex(regPC - 1));
+        message('Program end at PC=$' + addr2hex(regPC - 1));
         ui.stop();
       }
     }
@@ -1611,10 +1611,10 @@ function SimulatorWidget(node) {
     function handleMonitorRangeChange() {
 
       var $start  = $node.find('.start'),
-          $length = $node.find('.length'),
-          start   = parseInt($start.val(), 16),
-          length  = parseInt($length.val(), 16),
-          end     = start + length - 1;
+        $length = $node.find('.length'),
+        start   = parseInt($start.val(), 16),
+        length  = parseInt($length.val(), 16),
+        end     = start + length - 1;
 
       $start.removeClass('monitor-invalid');
       $length.removeClass('monitor-invalid');
@@ -1632,15 +1632,15 @@ function SimulatorWidget(node) {
     // Execute one instruction and print values
     function debugExec() {
       //if (codeRunning) {
-        execute(true);
+      execute(true);
       //}
       updateDebugInfo();
     }
 
     function updateDebugInfo() {
-      var html = "A=$" + num2hex(regA) + " X=$" + num2hex(regX) + " Y=$" + num2hex(regY) + 
-        " SP=$" + num2hex(regSP) + " PC=$" + addr2hex(regPC) + " NV-BDIZC: ";
-      for (var i = 7; i >=0; i--) {
+      var html = 'A=$' + num2hex(regA) + ' X=$' + num2hex(regX) + ' Y=$' + num2hex(regY) +
+        ' SP=$' + num2hex(regSP) + ' PC=$' + addr2hex(regPC) + ' NV-BDIZC: ';
+      for (var i = 7; i >= 0; i--) {
         html += regP >> i & 1;
       }
       $node.find('.minidebugger').html(html);
@@ -1649,21 +1649,21 @@ function SimulatorWidget(node) {
 
     // gotoAddr() - Set PC to address (or address of label)
     function gotoAddr() {
-      var inp = prompt("Enter address or label", "");
+      var inp = prompt('Enter address or label', '');
       var addr = 0;
       if (labels.find(inp)) {
         addr = labels.getPC(inp);
       } else {
         if (inp.match(/^0x[0-9a-f]{1,4}$/i)) {
-          inp = inp.replace(/^0x/, "");
+          inp = inp.replace(/^0x/, '');
           addr = parseInt(inp, 16);
         } else if (inp.match(/^\$[0-9a-f]{1,4}$/i)) {
-          inp = inp.replace(/^\$/, "");
+          inp = inp.replace(/^\$/, '');
           addr = parseInt(inp, 16);
         }
       }
       if (addr === 0) {
-        message("Unable to find/parse given address/label");
+        message('Unable to find/parse given address/label');
       } else {
         regPC = addr;
       }
@@ -1698,7 +1698,7 @@ function SimulatorWidget(node) {
     function stop() {
       codeRunning = false;
       clearInterval(executeId);
-      message("\nStopped\n");
+      message('\nStopped\n');
     }
 
     function toggleMonitor() {
@@ -1725,7 +1725,7 @@ function SimulatorWidget(node) {
     function indexLines(lines, symbols) {
       for (var i = 0; i < lines.length; i++) {
         if (!indexLine(lines[i], symbols)) {
-          message("**Label already defined at line " + (i + 1) + ":** " + lines[i]);
+          message('**Label already defined at line ' + (i + 1) + ':** ' + lines[i]);
           return false;
         }
       }
@@ -1735,21 +1735,21 @@ function SimulatorWidget(node) {
     // Extract label if line contains one and calculate position in memory.
     // Return false if label already exists.
     function indexLine(input, symbols) {
-          
+
       // Figure out how many bytes this instruction takes
       var currentPC = assembler.getCurrentPC();
       assembler.assembleLine(input, 0, symbols); //TODO: find a better way for Labels to have access to assembler
 
       // Find command or label
       if (input.match(/^\w+:/)) {
-        var label = input.replace(/(^\w+):.*$/, "$1");
-        
+        var label = input.replace(/(^\w+):.*$/, '$1');
+
         if (symbols.lookup(label)) {
-          message("**Label " + label + "is already used as a symbol; please rename one of them**");
+          message('**Label ' + label + 'is already used as a symbol; please rename one of them**');
           return false;
         }
-        
-        return push(label + "|" + currentPC);
+
+        return push(label + '|' + currentPC);
       }
       return true;
     }
@@ -1759,7 +1759,7 @@ function SimulatorWidget(node) {
       if (find(name)) {
         return false;
       }
-      labelIndex.push(name + "|");
+      labelIndex.push(name + '|');
       return true;
     }
 
@@ -1767,7 +1767,7 @@ function SimulatorWidget(node) {
     function find(name) {
       var nameAndAddr;
       for (var i = 0; i < labelIndex.length; i++) {
-        nameAndAddr = labelIndex[i].split("|");
+        nameAndAddr = labelIndex[i].split('|');
         if (name === nameAndAddr[0]) {
           return true;
         }
@@ -1779,9 +1779,9 @@ function SimulatorWidget(node) {
     function setPC(name, addr) {
       var nameAndAddr;
       for (var i = 0; i < labelIndex.length; i++) {
-        nameAndAddr = labelIndex[i].split("|");
+        nameAndAddr = labelIndex[i].split('|');
         if (name === nameAndAddr[0]) {
-          labelIndex[i] = name + "|" + addr;
+          labelIndex[i] = name + '|' + addr;
           return true;
         }
       }
@@ -1792,7 +1792,7 @@ function SimulatorWidget(node) {
     function getPC(name) {
       var nameAndAddr;
       for (var i = 0; i < labelIndex.length; i++) {
-        nameAndAddr = labelIndex[i].split("|");
+        nameAndAddr = labelIndex[i].split('|');
         if (name === nameAndAddr[0]) {
           return (nameAndAddr[1]);
         }
@@ -1801,11 +1801,11 @@ function SimulatorWidget(node) {
     }
 
     function displayMessage() {
-      var str = "Found " + labelIndex.length + " label";
+      var str = 'Found ' + labelIndex.length + ' label';
       if (labelIndex.length !== 1) {
-        str += "s";
+        str += 's';
       }
-      message(str + ".");
+      message(str + '.');
     }
 
     function reset() {
@@ -1830,86 +1830,86 @@ function SimulatorWidget(node) {
 
     var Opcodes = [
       /* Name, Imm,  ZP,   ZPX,  ZPY,  ABS, ABSX, ABSY,  IND, INDX, INDY, SNGL, BRA */
-      ["ADC", 0x69, 0x65, 0x75, null, 0x6d, 0x7d, 0x79, null, 0x61, 0x71, null, null],
-      ["AND", 0x29, 0x25, 0x35, null, 0x2d, 0x3d, 0x39, null, 0x21, 0x31, null, null],
-      ["ASL", null, 0x06, 0x16, null, 0x0e, 0x1e, null, null, null, null, 0x0a, null],
-      ["BIT", null, 0x24, null, null, 0x2c, null, null, null, null, null, null, null],
-      ["BPL", null, null, null, null, null, null, null, null, null, null, null, 0x10],
-      ["BMI", null, null, null, null, null, null, null, null, null, null, null, 0x30],
-      ["BVC", null, null, null, null, null, null, null, null, null, null, null, 0x50],
-      ["BVS", null, null, null, null, null, null, null, null, null, null, null, 0x70],
-      ["BCC", null, null, null, null, null, null, null, null, null, null, null, 0x90],
-      ["BCS", null, null, null, null, null, null, null, null, null, null, null, 0xb0],
-      ["BNE", null, null, null, null, null, null, null, null, null, null, null, 0xd0],
-      ["BEQ", null, null, null, null, null, null, null, null, null, null, null, 0xf0],
-      ["BRK", null, null, null, null, null, null, null, null, null, null, 0x00, null],
-      ["CMP", 0xc9, 0xc5, 0xd5, null, 0xcd, 0xdd, 0xd9, null, 0xc1, 0xd1, null, null],
-      ["CPX", 0xe0, 0xe4, null, null, 0xec, null, null, null, null, null, null, null],
-      ["CPY", 0xc0, 0xc4, null, null, 0xcc, null, null, null, null, null, null, null],
-      ["DEC", null, 0xc6, 0xd6, null, 0xce, 0xde, null, null, null, null, null, null],
-      ["EOR", 0x49, 0x45, 0x55, null, 0x4d, 0x5d, 0x59, null, 0x41, 0x51, null, null],
-      ["CLC", null, null, null, null, null, null, null, null, null, null, 0x18, null],
-      ["SEC", null, null, null, null, null, null, null, null, null, null, 0x38, null],
-      ["CLI", null, null, null, null, null, null, null, null, null, null, 0x58, null],
-      ["SEI", null, null, null, null, null, null, null, null, null, null, 0x78, null],
-      ["CLV", null, null, null, null, null, null, null, null, null, null, 0xb8, null],
-      ["CLD", null, null, null, null, null, null, null, null, null, null, 0xd8, null],
-      ["SED", null, null, null, null, null, null, null, null, null, null, 0xf8, null],
-      ["INC", null, 0xe6, 0xf6, null, 0xee, 0xfe, null, null, null, null, null, null],
-      ["JMP", null, null, null, null, 0x4c, null, null, 0x6c, null, null, null, null],
-      ["JSR", null, null, null, null, 0x20, null, null, null, null, null, null, null],
-      ["LDA", 0xa9, 0xa5, 0xb5, null, 0xad, 0xbd, 0xb9, null, 0xa1, 0xb1, null, null],
-      ["LDX", 0xa2, 0xa6, null, 0xb6, 0xae, null, 0xbe, null, null, null, null, null],
-      ["LDY", 0xa0, 0xa4, 0xb4, null, 0xac, 0xbc, null, null, null, null, null, null],
-      ["LSR", null, 0x46, 0x56, null, 0x4e, 0x5e, null, null, null, null, 0x4a, null],
-      ["NOP", null, null, null, null, null, null, null, null, null, null, 0xea, null],
-      ["ORA", 0x09, 0x05, 0x15, null, 0x0d, 0x1d, 0x19, null, 0x01, 0x11, null, null],
-      ["TAX", null, null, null, null, null, null, null, null, null, null, 0xaa, null],
-      ["TXA", null, null, null, null, null, null, null, null, null, null, 0x8a, null],
-      ["DEX", null, null, null, null, null, null, null, null, null, null, 0xca, null],
-      ["INX", null, null, null, null, null, null, null, null, null, null, 0xe8, null],
-      ["TAY", null, null, null, null, null, null, null, null, null, null, 0xa8, null],
-      ["TYA", null, null, null, null, null, null, null, null, null, null, 0x98, null],
-      ["DEY", null, null, null, null, null, null, null, null, null, null, 0x88, null],
-      ["INY", null, null, null, null, null, null, null, null, null, null, 0xc8, null],
-      ["ROR", null, 0x66, 0x76, null, 0x6e, 0x7e, null, null, null, null, 0x6a, null],
-      ["ROL", null, 0x26, 0x36, null, 0x2e, 0x3e, null, null, null, null, 0x2a, null],
-      ["RTI", null, null, null, null, null, null, null, null, null, null, 0x40, null],
-      ["RTS", null, null, null, null, null, null, null, null, null, null, 0x60, null],
-      ["SBC", 0xe9, 0xe5, 0xf5, null, 0xed, 0xfd, 0xf9, null, 0xe1, 0xf1, null, null],
-      ["STA", null, 0x85, 0x95, null, 0x8d, 0x9d, 0x99, null, 0x81, 0x91, null, null],
-      ["TXS", null, null, null, null, null, null, null, null, null, null, 0x9a, null],
-      ["TSX", null, null, null, null, null, null, null, null, null, null, 0xba, null],
-      ["PHA", null, null, null, null, null, null, null, null, null, null, 0x48, null],
-      ["PLA", null, null, null, null, null, null, null, null, null, null, 0x68, null],
-      ["PHP", null, null, null, null, null, null, null, null, null, null, 0x08, null],
-      ["PLP", null, null, null, null, null, null, null, null, null, null, 0x28, null],
-      ["STX", null, 0x86, null, 0x96, 0x8e, null, null, null, null, null, null, null],
-      ["STY", null, 0x84, 0x94, null, 0x8c, null, null, null, null, null, null, null],
-      ["WDM", 0x42, 0x42, null, null, null, null, null, null, null, null, null, null],
-      ["---", null, null, null, null, null, null, null, null, null, null, null, null]
+      ['ADC', 0x69, 0x65, 0x75, null, 0x6d, 0x7d, 0x79, null, 0x61, 0x71, null, null],
+      ['AND', 0x29, 0x25, 0x35, null, 0x2d, 0x3d, 0x39, null, 0x21, 0x31, null, null],
+      ['ASL', null, 0x06, 0x16, null, 0x0e, 0x1e, null, null, null, null, 0x0a, null],
+      ['BIT', null, 0x24, null, null, 0x2c, null, null, null, null, null, null, null],
+      ['BPL', null, null, null, null, null, null, null, null, null, null, null, 0x10],
+      ['BMI', null, null, null, null, null, null, null, null, null, null, null, 0x30],
+      ['BVC', null, null, null, null, null, null, null, null, null, null, null, 0x50],
+      ['BVS', null, null, null, null, null, null, null, null, null, null, null, 0x70],
+      ['BCC', null, null, null, null, null, null, null, null, null, null, null, 0x90],
+      ['BCS', null, null, null, null, null, null, null, null, null, null, null, 0xb0],
+      ['BNE', null, null, null, null, null, null, null, null, null, null, null, 0xd0],
+      ['BEQ', null, null, null, null, null, null, null, null, null, null, null, 0xf0],
+      ['BRK', null, null, null, null, null, null, null, null, null, null, 0x00, null],
+      ['CMP', 0xc9, 0xc5, 0xd5, null, 0xcd, 0xdd, 0xd9, null, 0xc1, 0xd1, null, null],
+      ['CPX', 0xe0, 0xe4, null, null, 0xec, null, null, null, null, null, null, null],
+      ['CPY', 0xc0, 0xc4, null, null, 0xcc, null, null, null, null, null, null, null],
+      ['DEC', null, 0xc6, 0xd6, null, 0xce, 0xde, null, null, null, null, null, null],
+      ['EOR', 0x49, 0x45, 0x55, null, 0x4d, 0x5d, 0x59, null, 0x41, 0x51, null, null],
+      ['CLC', null, null, null, null, null, null, null, null, null, null, 0x18, null],
+      ['SEC', null, null, null, null, null, null, null, null, null, null, 0x38, null],
+      ['CLI', null, null, null, null, null, null, null, null, null, null, 0x58, null],
+      ['SEI', null, null, null, null, null, null, null, null, null, null, 0x78, null],
+      ['CLV', null, null, null, null, null, null, null, null, null, null, 0xb8, null],
+      ['CLD', null, null, null, null, null, null, null, null, null, null, 0xd8, null],
+      ['SED', null, null, null, null, null, null, null, null, null, null, 0xf8, null],
+      ['INC', null, 0xe6, 0xf6, null, 0xee, 0xfe, null, null, null, null, null, null],
+      ['JMP', null, null, null, null, 0x4c, null, null, 0x6c, null, null, null, null],
+      ['JSR', null, null, null, null, 0x20, null, null, null, null, null, null, null],
+      ['LDA', 0xa9, 0xa5, 0xb5, null, 0xad, 0xbd, 0xb9, null, 0xa1, 0xb1, null, null],
+      ['LDX', 0xa2, 0xa6, null, 0xb6, 0xae, null, 0xbe, null, null, null, null, null],
+      ['LDY', 0xa0, 0xa4, 0xb4, null, 0xac, 0xbc, null, null, null, null, null, null],
+      ['LSR', null, 0x46, 0x56, null, 0x4e, 0x5e, null, null, null, null, 0x4a, null],
+      ['NOP', null, null, null, null, null, null, null, null, null, null, 0xea, null],
+      ['ORA', 0x09, 0x05, 0x15, null, 0x0d, 0x1d, 0x19, null, 0x01, 0x11, null, null],
+      ['TAX', null, null, null, null, null, null, null, null, null, null, 0xaa, null],
+      ['TXA', null, null, null, null, null, null, null, null, null, null, 0x8a, null],
+      ['DEX', null, null, null, null, null, null, null, null, null, null, 0xca, null],
+      ['INX', null, null, null, null, null, null, null, null, null, null, 0xe8, null],
+      ['TAY', null, null, null, null, null, null, null, null, null, null, 0xa8, null],
+      ['TYA', null, null, null, null, null, null, null, null, null, null, 0x98, null],
+      ['DEY', null, null, null, null, null, null, null, null, null, null, 0x88, null],
+      ['INY', null, null, null, null, null, null, null, null, null, null, 0xc8, null],
+      ['ROR', null, 0x66, 0x76, null, 0x6e, 0x7e, null, null, null, null, 0x6a, null],
+      ['ROL', null, 0x26, 0x36, null, 0x2e, 0x3e, null, null, null, null, 0x2a, null],
+      ['RTI', null, null, null, null, null, null, null, null, null, null, 0x40, null],
+      ['RTS', null, null, null, null, null, null, null, null, null, null, 0x60, null],
+      ['SBC', 0xe9, 0xe5, 0xf5, null, 0xed, 0xfd, 0xf9, null, 0xe1, 0xf1, null, null],
+      ['STA', null, 0x85, 0x95, null, 0x8d, 0x9d, 0x99, null, 0x81, 0x91, null, null],
+      ['TXS', null, null, null, null, null, null, null, null, null, null, 0x9a, null],
+      ['TSX', null, null, null, null, null, null, null, null, null, null, 0xba, null],
+      ['PHA', null, null, null, null, null, null, null, null, null, null, 0x48, null],
+      ['PLA', null, null, null, null, null, null, null, null, null, null, 0x68, null],
+      ['PHP', null, null, null, null, null, null, null, null, null, null, 0x08, null],
+      ['PLP', null, null, null, null, null, null, null, null, null, null, 0x28, null],
+      ['STX', null, 0x86, null, 0x96, 0x8e, null, null, null, null, null, null, null],
+      ['STY', null, 0x84, 0x94, null, 0x8c, null, null, null, null, null, null, null],
+      ['WDM', 0x42, 0x42, null, null, null, null, null, null, null, null, null, null],
+      ['---', null, null, null, null, null, null, null, null, null, null, null, null]
     ];
-    
+
     // Assembles the code into memory
     function assembleCode() {
       var BOOTSTRAP_ADDRESS = 0x600;
 
       wasOutOfRangeBranch = false;
-  
+
       simulator.reset();
       labels.reset();
       defaultCodePC = BOOTSTRAP_ADDRESS;
       $node.find('.messages code').empty();
 
       var code = $node.find('.code').val();
-      code += "\n\n";
-      var lines = code.split("\n");
+      code += '\n\n';
+      var lines = code.split('\n');
       codeAssembledOK = true;
 
-      message("Preprocessing ...");
+      message('Preprocessing ...');
       var symbols = preprocess(lines);
 
-      message("Indexing labels ...");
+      message('Indexing labels ...');
       defaultCodePC = BOOTSTRAP_ADDRESS;
       if (!labels.indexLines(lines, symbols)) {
         return false;
@@ -1917,8 +1917,8 @@ function SimulatorWidget(node) {
       labels.displayMessage();
 
       defaultCodePC = BOOTSTRAP_ADDRESS;
-      message("Assembling code ...");
-      
+      message('Assembling code ...');
+
       codeLen = 0;
       for (var i = 0; i < lines.length; i++) {
         if (!assembleLine(lines[i], i, symbols)) {
@@ -1929,7 +1929,7 @@ function SimulatorWidget(node) {
 
       if (codeLen === 0) {
         codeAssembledOK = false;
-        message("No code to run.");
+        message('No code to run.');
       }
 
       if (codeAssembledOK) {
@@ -1937,10 +1937,10 @@ function SimulatorWidget(node) {
         memory.set(defaultCodePC, 0x00); //set a null byte at the end of the code
       } else {
 
-        var str = lines[i].replace("<", "&lt;").replace(">", "&gt;");
+        var str = lines[i].replace('<', '&lt;').replace('>', '&gt;');
 
         if(!wasOutOfRangeBranch) {
-          message("**Syntax error line " + (i + 1) + ": " + str + "**");
+          message('**Syntax error line ' + (i + 1) + ': ' + str + '**');
         } else {
           message('**Out of range branch on line ' + (i + 1) + ' (branches are limited to -128 to +127): ' + str + '**');
         }
@@ -1949,51 +1949,51 @@ function SimulatorWidget(node) {
         return false;
       }
 
-      message("Code assembled successfully, " + codeLen + " bytes.");
+      message('Code assembled successfully, ' + codeLen + ' bytes.');
       return true;
     }
 
     // Sanitize input: remove comments and trim leading/trailing whitespace
     function sanitize(line) {
       // remove comments
-      var no_comments = line.replace(/^(.*?);.*/, "$1");
-  
+      var no_comments = line.replace(/^(.*?);.*/, '$1');
+
       // trim line
-      return no_comments.replace(/^\s+/, "").replace(/\s+$/, "");
+      return no_comments.replace(/^\s+/, '').replace(/\s+$/, '');
     }
 
     function preprocess(lines) {
       var table = [];
-      var PREFIX = "__"; // Using a prefix avoids clobbering any predefined properties
-      
+      var PREFIX = '__'; // Using a prefix avoids clobbering any predefined properties
+
       function lookup(key) {
         if (table.hasOwnProperty(PREFIX + key)) return table[PREFIX + key];
         else return undefined;
       }
-      
+
       function add(key, value) {
         var valueAlreadyExists = table.hasOwnProperty(PREFIX + key)
         if (!valueAlreadyExists) {
           table[PREFIX + key] = value;
         }
       }
-        
+
       // Build the substitution table
       for (var i = 0; i < lines.length; i++) {
         lines[i] = sanitize(lines[i]);
         var match_data = lines[i].match(/^define\s+(\w+)\s+(\S+)/);
         if (match_data) {
           add(match_data[1], sanitize(match_data[2]));
-          lines[i] = ""; // We're done with this preprocessor directive, so delete it
+          lines[i] = ''; // We're done with this preprocessor directive, so delete it
         }
       }
-      
+
       // Callers will only need the lookup function
       return {
         lookup: lookup
       }
     }
-  
+
     // Assembles one line of code.
     // Returns true if it assembled successfully, false otherwise.
     function assembleLine(input, lineno, symbols) {
@@ -2001,19 +2001,19 @@ function SimulatorWidget(node) {
 
       // Find command or label
       if (input.match(/^\w+:/)) {
-        label = input.replace(/(^\w+):.*$/, "$1");
+        label = input.replace(/(^\w+):.*$/, '$1');
         if (input.match(/^\w+:[\s]*\w+.*$/)) {
-          input = input.replace(/^\w+:[\s]*(.*)$/, "$1");
-          command = input.replace(/^(\w+).*$/, "$1");
+          input = input.replace(/^\w+:[\s]*(.*)$/, '$1');
+          command = input.replace(/^(\w+).*$/, '$1');
         } else {
-          command = "";
+          command = '';
         }
       } else {
-        command = input.replace(/^(\w+).*$/, "$1");
+        command = input.replace(/^(\w+).*$/, '$1');
       }
 
       // Nothing to do for blank lines
-      if (command === "") {
+      if (command === '') {
         return true;
       }
 
@@ -2021,15 +2021,15 @@ function SimulatorWidget(node) {
 
       if (input.match(/^\*\s*=\s*\$?[0-9a-f]*$/)) {
         // equ spotted
-        param = input.replace(/^\s*\*\s*=\s*/, "");
-        if (param[0] === "$") {
-          param = param.replace(/^\$/, "");
+        param = input.replace(/^\s*\*\s*=\s*/, '');
+        if (param[0] === '$') {
+          param = param.replace(/^\$/, '');
           addr = parseInt(param, 16);
         } else {
           addr = parseInt(param, 10);
         }
         if ((addr < 0) || (addr > 0xffff)) {
-          message("Unable to relocate code outside 64k memory");
+          message('Unable to relocate code outside 64k memory');
           return false;
         }
         defaultCodePC = addr;
@@ -2037,16 +2037,16 @@ function SimulatorWidget(node) {
       }
 
       if (input.match(/^\w+\s+.*?$/)) {
-        param = input.replace(/^\w+\s+(.*?)/, "$1");
+        param = input.replace(/^\w+\s+(.*?)/, '$1');
       } else if (input.match(/^\w+$/)) {
-        param = "";
+        param = '';
       } else {
         return false;
       }
 
-      param = param.replace(/[ ]/g, "");
+      param = param.replace(/[ ]/g, '');
 
-      if (command === "DCB") {
+      if (command === 'DCB') {
         return DCB(param);
       }
       for (var o = 0; o < Opcodes.length; o++) {
@@ -2065,22 +2065,22 @@ function SimulatorWidget(node) {
           if (checkBranch(param, Opcodes[o][12])) { return true; }
         }
       }
-      
+
       return false; // Unknown syntax
     }
 
     function DCB(param) {
       var values, number, str, ch;
-      values = param.split(",");
+      values = param.split(',');
       if (values.length === 0) { return false; }
       for (var v = 0; v < values.length; v++) {
         str = values[v];
         if (str) {
           ch = str.substring(0, 1);
-          if (ch === "$") {
-            number = parseInt(str.replace(/^\$/, ""), 16);
+          if (ch === '$') {
+            number = parseInt(str.replace(/^\$/, ''), 16);
             pushByte(number);
-          } else if (ch >= "0" && ch <= "9") {
+          } else if (ch >= '0' && ch <= '9') {
             number = parseInt(str, 10);
             pushByte(number);
           } else {
@@ -2090,7 +2090,7 @@ function SimulatorWidget(node) {
       }
       return true;
     }
-    
+
     // Try to parse the given parameter as a byte operand.
     // Returns the (positive) value if successful, otherwise -1
     function tryParseByteOperand(param, symbols) {
@@ -2100,9 +2100,9 @@ function SimulatorWidget(node) {
           param = lookupVal;
         }
       }
-      
+
       var value;
-    
+
       // Is it a hexadecimal operand?
       var match_data = param.match(/^\$([0-9a-f]{1,2})$/i);
       if (match_data) {
@@ -2114,15 +2114,15 @@ function SimulatorWidget(node) {
           value = parseInt(match_data[1], 10);
         }
       }
-      
+
       // Validate range
       if (value >= 0 && value <= 0xff) {
         return value;
       } else {
-        return -1;  
+        return -1;
       }
     }
-    
+
     // Try to parse the given parameter as a word operand.
     // Returns the (positive) value if successful, otherwise -1
     function tryParseWordOperand(param, symbols) {
@@ -2132,9 +2132,9 @@ function SimulatorWidget(node) {
           param = lookupVal;
         }
       }
-      
+
       var value;
-    
+
       // Is it a hexadecimal operand?
       var match_data = param.match(/^\$([0-9a-f]{3,4})$/i);
       if (match_data) {
@@ -2146,7 +2146,7 @@ function SimulatorWidget(node) {
           value = parseInt(match_data[1], 10);
         }
       }
-      
+
       // Validate range
       if (value >= 0 && value <= 0xffff) {
         return value;
@@ -2170,8 +2170,8 @@ function SimulatorWidget(node) {
       var distance = addr - defaultCodePC - 1;
 
       if(distance < -128 || distance > 127) {
-          wasOutOfRangeBranch = true;
-          return false;
+        wasOutOfRangeBranch = true;
+        return false;
       }
 
       pushByte(distance);
@@ -2182,7 +2182,7 @@ function SimulatorWidget(node) {
     function checkImmediate(param, opcode, symbols) {
       var value, label, hilo, addr;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^#([\w\$]+)$/i);
       if (match_data) {
         var operand = tryParseByteOperand(match_data[1], symbols);
@@ -2192,30 +2192,30 @@ function SimulatorWidget(node) {
           return true;
         }
       }
-      
+
       // Label lo/hi
       if (param.match(/^#[<>]\w+$/)) {
-        label = param.replace(/^#[<>](\w+)$/, "$1");
-        hilo = param.replace(/^#([<>]).*$/, "$1");
+        label = param.replace(/^#[<>](\w+)$/, '$1');
+        hilo = param.replace(/^#([<>]).*$/, '$1');
         pushByte(opcode);
         if (labels.find(label)) {
           addr = labels.getPC(label);
           switch(hilo) {
-          case ">":
-            pushByte((addr >> 8) & 0xff);
-            return true;
-          case "<":
-            pushByte(addr & 0xff);
-            return true;
-          default:
-            return false;
+            case '>':
+              pushByte((addr >> 8) & 0xff);
+              return true;
+            case '<':
+              pushByte(addr & 0xff);
+              return true;
+            default:
+              return false;
           }
         } else {
           pushByte(0x00);
           return true;
         }
       }
-      
+
       return false;
     }
 
@@ -2223,7 +2223,7 @@ function SimulatorWidget(node) {
     function checkIndirect(param, opcode, symbols) {
       var value;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^\(([\w\$]+)\)$/i);
       if (match_data) {
         var operand = tryParseWordOperand(match_data[1], symbols);
@@ -2240,7 +2240,7 @@ function SimulatorWidget(node) {
     function checkIndirectX(param, opcode, symbols) {
       var value;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^\(([\w\$]+),X\)$/i);
       if (match_data) {
         var operand = tryParseByteOperand(match_data[1], symbols);
@@ -2257,7 +2257,7 @@ function SimulatorWidget(node) {
     function checkIndirectY(param, opcode, symbols) {
       var value;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^\(([\w\$]+)\),Y$/i);
       if (match_data) {
         var operand = tryParseByteOperand(match_data[1], symbols);
@@ -2274,7 +2274,7 @@ function SimulatorWidget(node) {
     function checkSingle(param, opcode) {
       if (opcode === null) { return false; }
       // Accumulator instructions are counted as single-byte opcodes
-      if (param !== "" && param !== "A") { return false; }
+      if (param !== '' && param !== 'A') { return false; }
       pushByte(opcode);
       return true;
     }
@@ -2290,7 +2290,7 @@ function SimulatorWidget(node) {
         pushByte(operand);
         return true;
       }
-      
+
       return false;
     }
 
@@ -2298,7 +2298,7 @@ function SimulatorWidget(node) {
     function checkAbsoluteX(param, opcode, symbols) {
       var number, value, addr;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^([\w\$]+),X$/i);
       if (match_data) {
         var operand = tryParseWordOperand(match_data[1], symbols);
@@ -2311,7 +2311,7 @@ function SimulatorWidget(node) {
 
       // it could be a label too..
       if (param.match(/^\w+,X$/i)) {
-        param = param.replace(/,X$/i, "");
+        param = param.replace(/,X$/i, '');
         pushByte(opcode);
         if (labels.find(param)) {
           addr = labels.getPC(param);
@@ -2331,7 +2331,7 @@ function SimulatorWidget(node) {
     function checkAbsoluteY(param, opcode, symbols) {
       var number, value, addr;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^([\w\$]+),Y$/i);
       if (match_data) {
         var operand = tryParseWordOperand(match_data[1], symbols);
@@ -2344,7 +2344,7 @@ function SimulatorWidget(node) {
 
       // it could be a label too..
       if (param.match(/^\w+,Y$/i)) {
-        param = param.replace(/,Y$/i, "");
+        param = param.replace(/,Y$/i, '');
         pushByte(opcode);
         if (labels.find(param)) {
           addr = labels.getPC(param);
@@ -2363,7 +2363,7 @@ function SimulatorWidget(node) {
     function checkZeroPageX(param, opcode, symbols) {
       var number, value;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^([\w\$]+),X$/i);
       if (match_data) {
         var operand = tryParseByteOperand(match_data[1], symbols);
@@ -2373,7 +2373,7 @@ function SimulatorWidget(node) {
           return true;
         }
       }
-      
+
       return false;
     }
 
@@ -2381,7 +2381,7 @@ function SimulatorWidget(node) {
     function checkZeroPageY(param, opcode, symbols) {
       var number, value;
       if (opcode === null) { return false; }
-      
+
       var match_data = param.match(/^([\w\$]+),Y$/i);
       if (match_data) {
         var operand = tryParseByteOperand(match_data[1], symbols);
@@ -2391,7 +2391,7 @@ function SimulatorWidget(node) {
           return true;
         }
       }
-      
+
       return false;
     }
 
@@ -2637,7 +2637,7 @@ function SimulatorWidget(node) {
   }
 
   function num2hex(nr) {
-    var str = "0123456789abcdef";
+    var str = '0123456789abcdef';
     var hi = ((nr & 0xf0) >> 4);
     var lo = (nr & 15);
     return str.substring(hi, hi + 1) + str.substring(lo, lo + 1);
@@ -2645,7 +2645,7 @@ function SimulatorWidget(node) {
 
   // Prints text in the message window
   function message(text) {
-    if (text.length>1)
+    if (text.length > 1)
       text += '\n'; // allow putc operations from the simulator (WDM opcode)
     $node.find('.messages code').append(text).scrollTop(10000);
   }