diff --git a/index.html b/index.html
index d15854b9..9e4888dc 100644
--- a/index.html
+++ b/index.html
@@ -191,7 +191,6 @@ a.dropdown-toggle {
 <script src="src/platform/vcs.js"></script>
 <script src="src/platform/apple2.js"></script>
 <script src="src/platform/atarivec.js"></script>
-<script src="local/vecrom.js"></script>
 <script src="src/ui.js"></script>
 
 </body>
diff --git a/javatari.js b/javatari.js
index b785efb3..531e9454 160000
--- a/javatari.js
+++ b/javatari.js
@@ -1 +1 @@
-Subproject commit b785efb3b9d653e7c1497301e093257206f25875
+Subproject commit 531e945457a1714c11b7cf71aafc4216d14992bb
diff --git a/src/emu.js b/src/emu.js
index 7fad53ee..7555b924 100644
--- a/src/emu.js
+++ b/src/emu.js
@@ -1,7 +1,8 @@
+"use strict";
 
 // Emulator classes
 
-RasterVideo = function(mainElement, width, height, options) {
+var RasterVideo = function(mainElement, width, height, options) {
   var self = this;
   var canvas, ctx;
   var imageData, buf8, datau32;
@@ -85,7 +86,7 @@ mainElement.appendChild(borderElement);
 */
 }
 
-VectorVideo = function(mainElement, width, height) {
+var VectorVideo = function(mainElement, width, height) {
   var self = this;
   var canvas, ctx;
   var persistenceAlpha = 0.5;
@@ -151,17 +152,17 @@ VectorVideo = function(mainElement, width, height) {
   }
 }
 
-SampleAudio = function(clockfreq) {
+var SampleAudio = function(clockfreq) {
 
 }
 
-RAM = function(size) {
+var RAM = function(size) {
   var memArray = new ArrayBuffer(size);
   this.mem = new Uint8Array(memArray);
 }
 
 // TODO
-AnimationTimer = function(frequencyHz, callback) {
+var AnimationTimer = function(frequencyHz, callback) {
   var intervalMsec = 1000.0 / frequencyHz;
   var curTime = 0;
   var running;
diff --git a/src/platform/apple2.js b/src/platform/apple2.js
index 29c575d8..aafc681c 100644
--- a/src/platform/apple2.js
+++ b/src/platform/apple2.js
@@ -1,14 +1,19 @@
+"use strict";
 
-var PRESETS = [
-]
+var APPLE2_PRESETS = [
+];
 
-Apple2Platform = function(mainElement) {
+var Apple2Platform = function(mainElement) {
   var self = this;
   var cpuFrequency = 1.023;
   var cpuCyclesPerLine = 65;
   var cpu, ram, rom, bus;
   var video, audio, timer;
 
+  this.getPresets = function() {
+    return APPLE2_PRESETS;
+  }
+
   this.start = function() {
     cpu = new jt.M6502();
     ram = new RAM(0xc000);
@@ -185,7 +190,7 @@ Apple2Platform = function(mainElement) {
   }
 };
 
-APPLEIIGO_LZG = [
+var APPLEIIGO_LZG = [
   76,90,71,0,0,48,0,0,0,5,159,47,60,46,159,1,21,25,30,52,65,80,80,76,69,73,73,71,79,32,82,79,
   77,49,46,48,0,52,31,52,31,52,31,52,31,52,31,52,31,52,31,52,31,52,28,52,6,32,0,224,25,30,67,52,
   30,52,28,25,31,174,52,31,52,30,52,28,52,6,25,63,107,52,31,52,30,52,28,25,63,101,52,19,25,31,139,52,
diff --git a/src/platform/atarivec.js b/src/platform/atarivec.js
index 7729b366..595013ac 100644
--- a/src/platform/atarivec.js
+++ b/src/platform/atarivec.js
@@ -1,8 +1,9 @@
+"use strict";
 
-var PRESETS = [
+var ATARIVEC_PRESETS = [
 ]
 
-AtariVectorPlatform = function(mainElement) {
+var AtariVectorPlatform = function(mainElement) {
   var self = this;
   var cpuFrequency = 1500000.0;
   var cpuCyclesPerNMI = 6000;
@@ -13,11 +14,14 @@ AtariVectorPlatform = function(mainElement) {
   var switches = new RAM(16).mem;
   var nmicount = cpuCyclesPerNMI;
 
+  this.getPresets = function() {
+    return ATARIVEC_PRESETS;
+  }
+
   this.start = function() {
     cpu = new jt.M6502();
     cpuram = new RAM(0x400);
     dvgram = new RAM(0x2000);
-    vecrom = VECROM;
     //switches[5] = 0xff;
     //switches[7] = 0xff;
     // bus
@@ -79,6 +83,7 @@ AtariVectorPlatform = function(mainElement) {
           //console.log(n, clock, nmicount);
         }
         cpu.clockPulse();
+        //cpu.executeInstruction();
       }
     });
     video.setKeyboardEvents(function(key,flags) {
@@ -107,10 +112,11 @@ AtariVectorPlatform = function(mainElement) {
   }
 
   this.loadROM = function(title, data) {
-    if(data.length != 0x1800) {
-      throw "ROM length must be == 0x1800";
+    if(data.length != 0x2000) {
+      throw "ROM length must be == 0x2000";
     }
-    rom = data;
+    rom = data.slice(0,0x1800);
+    vecrom = data.slice(0x1800,0x2000);
     this.reset();
   }
 
@@ -230,7 +236,7 @@ AtariVectorPlatform = function(mainElement) {
   }
 }
 
-DVGStateMachine = function(bus, video) {
+var DVGStateMachine = function(bus, video) {
   var self = this;
   var pc = 0;
   var x = 0;
@@ -246,7 +252,7 @@ DVGStateMachine = function(bus, video) {
   }
 
   function decodeSigned(w, o2) {
-    s = w & (1<<o2);
+    var s = w & (1<<o2);
     w = w & ((1<<o2)-1);
     if (s)
       return -w;
@@ -269,7 +275,7 @@ DVGStateMachine = function(bus, video) {
     //console.log('DVG',i);
   }
 
-  GSCALES = [7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8];
+  var GSCALES = [7, 6, 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8];
 
   this.nextInstruction = function() {
     if (!running) return;
diff --git a/src/platform/vcs.js b/src/platform/vcs.js
index 556ea784..80704f56 100644
--- a/src/platform/vcs.js
+++ b/src/platform/vcs.js
@@ -1,5 +1,6 @@
+"use strict";
 
-var PRESETS = [
+var VCS_PRESETS = [
   {id:'examples/hello', chapter:4, name:'Hello 6502 and TIA'},
   {id:'examples/vsync', chapter:5, name:'Painting on the CRT', title:'Color Bars'},
   {id:'examples/playfield', chapter:6, name:'Playfield Graphics'},
@@ -35,9 +36,11 @@ Javatari.CARTRIDGE_CHANGE_DISABLED = true;
 Javatari.DEBUG_SCANLINE_OVERFLOW = false; // TODO: make a switch
 Javatari.AUDIO_BUFFER_SIZE = 256;
 
-VCSPlatform = function() {
+var VCSPlatform = function() {
   var self = this;
 
+  this.getPresets = function() { return VCS_PRESETS; }
+
   this.start = function() {
     Javatari.start();
   }
diff --git a/src/ui.js b/src/ui.js
index 4d5cda74..3d9b651f 100644
--- a/src/ui.js
+++ b/src/ui.js
@@ -1,3 +1,4 @@
+"use strict";
 
 // 8bitworkshop IDE user interface
 
@@ -9,7 +10,7 @@ var offset2line = null;
 var line2offset = null;
 var trace_pending_at_pc;
 
-// vars: PRESETS, platform
+var PRESETS, platform;
 
 var CODE = 'code1';
 var editor = CodeMirror(document.getElementById('editor'), {
@@ -21,7 +22,7 @@ var editor = CodeMirror(document.getElementById('editor'), {
 });
 //editor.setSize("100%", "95%"); // TODO
 editor.on('changes', function(ed, changeobj) {
-  text = editor.getValue() || "";
+  var text = editor.getValue() || "";
   setCode(text);
 });
 
@@ -243,7 +244,7 @@ worker.onmessage = function(e) {
     current_output = null;
   } else {
     gutters.removeClass("has-errors");
-    updatePreset(current_preset_id, text);
+    updatePreset(current_preset_id, editor.getValue()); // update persisted entry
     // load ROM
     var rom = e.data.output.slice(2);
     var rom_changed = rom && !arrayCompare(rom, current_output);
@@ -266,7 +267,7 @@ worker.onmessage = function(e) {
       editor.clearGutter("gutter-clock");
       offset2line = {};
       line2offset = {};
-      for (info of e.data.listing.lines) {
+      for (var info of e.data.listing.lines) {
         if (info.offset) {
           var textel = document.createTextNode(info.offset.toString(16));
           editor.setGutterMarker(info.line-1, "gutter-offset", textel);
@@ -658,6 +659,7 @@ function showWelcomeMessage() {
   {
     // Instance the tour
     var tour = new Tour({
+      autoscroll:false,
       //storage:false,
       steps: [
         {
@@ -688,12 +690,8 @@ function showWelcomeMessage() {
           content: "Click the menu to create new files and share your work with others."
         },
     ]});
-
-    // Initialize the tour
     tour.init();
-
-    // Start the tour
-    tour.start();
+    setTimeout(function() { tour.start(); }, 2000);
   }
 }
 
@@ -735,6 +733,18 @@ try {
     if (!qs['platform']) {
       qs['platform'] = 'vcs';
     }
+    // load and start platform object
+    if (qs['platform'] == 'vcs') {
+      platform = new VCSPlatform();
+    } else if (qs['platform'] == 'apple2') {
+      platform = new Apple2Platform($("#emulator")[0]);
+    } else if (qs['platform'] == 'atarivec') {
+      platform = new AtariVectorPlatform($("#emulator")[0]);
+    } else {
+      alert("Platform " + qs['platform'] + " not recognized");
+    }
+    PRESETS = platform.getPresets();
+    platform.start();
     // reset file?
     if (qs['file'] && qs['reset']) {
       localStorage.removeItem(qs['file']);
@@ -750,19 +760,6 @@ try {
       var lastid = localStorage.getItem("__lastid");
       gotoPresetNamed(lastid || PRESETS[0].id);
     }
-    // load and start platform object
-    if (qs['platform'] == 'vcs') {
-      platform = new VCSPlatform();
-      platform.start();
-    } else if (qs['platform'] == 'apple2') {
-      platform = new Apple2Platform($("#emulator")[0]);
-      platform.start();
-    } else if (qs['platform'] == 'atarivec') {
-      platform = new AtariVectorPlatform($("#emulator")[0]);
-      platform.start();
-    } else {
-      alert("Platform " + qs['platform'] + " not recognized");
-    }
   }
 } catch (e) {
   alert(e+""); // TODO?
diff --git a/src/worker/workermain.js b/src/worker/workermain.js
index dae55122..40f0b7b3 100644
--- a/src/worker/workermain.js
+++ b/src/worker/workermain.js
@@ -1,3 +1,5 @@
+"use strict";
+
 // set up require.js for worker
 importScripts("../../dasm.js");
 
@@ -17,9 +19,9 @@ var document = noop();
 document.documentElement = noop();
 document.documentElement.style = noop();
 
-MAIN_FILENAME = "main.a";
-PREAMBLE = "\tprocessor 6502\n";
-PREAMBLE_LINES = 1;
+var MAIN_FILENAME = "main.a";
+var PREAMBLE = "\tprocessor 6502\n";
+var PREAMBLE_LINES = 1;
 
 function parseListing(code, unresolved) {
   var errorMatch = /main.a [(](\d+)[)]: error: (.+)/;
@@ -60,7 +62,7 @@ function parseListing(code, unresolved) {
       }
       // TODO: check filename too
       // TODO: better symbol test (word boundaries)
-      for (key in unresolved) {
+      for (var key in unresolved) {
         var pos = restline ? restline.indexOf(key) : line.indexOf(key);
         if (pos >= 0) {
           errors.push({