diff --git a/electron.html b/electron.html
index b8cda460..f3867117 100644
--- a/electron.html
+++ b/electron.html
@@ -373,7 +373,7 @@ body {
 <script src="codemirror/addon/selection/active-line.js"></script>
 <link rel="stylesheet" href="codemirror/addon/dialog/dialog.css">
 <script src="javatari.js/release/javatari/javatari.js"></script>
-<script src="src/common/cpu/6809.js"></script>
+
 <!-- UI-only stuff -->
 <link rel="stylesheet" href="lib/bootstrap-tourist.css">
 <script src="lib/bootstrap-tourist.js"></script>
diff --git a/index.html b/index.html
index ffabf077..2cbd108d 100644
--- a/index.html
+++ b/index.html
@@ -530,6 +530,7 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
 <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
 <script src="bootstrap/js/bootstrap.min.js"></script>
 <script src="bootstrap/js/bootbox.all.min.js"></script>
+<link rel="stylesheet" href="lib/bootstrap-tourist.css">
 
 <script src="src/codemirror/codemirror.js"></script>
 <script src="codemirror/mode/clike/clike.js"></script>
@@ -553,17 +554,15 @@ if (window.location.host.endsWith('8bitworkshop.com')) {
 <script src="codemirror/addon/dialog/dialog.js"></script>
 <script src="codemirror/addon/selection/active-line.js"></script>
 <link rel="stylesheet" href="codemirror/addon/dialog/dialog.css">
+
 <script src="javatari.js/release/javatari/javatari.js"></script>
-<script src="src/common/cpu/6809.js"></script>
-<!-- UI-only stuff -->
-<link rel="stylesheet" href="lib/bootstrap-tourist.css">
-<script src="lib/bootstrap-tourist.js"></script>
 
 <script src="tss/js/tss/PsgDeviceChannel.js"></script>
 <script src="tss/js/tss/MasterChannel.js"></script>
 <script src="tss/js/tss/AudioLooper.js"></script>
 <script src="tss/js/Log.js"></script>
 
+<!-- main IDE module -->
 <script src="gen/ui.js" type="module"></script>
 
 <script>
diff --git a/src/common/baseplatform.ts b/src/common/baseplatform.ts
index 6baabde7..4d791a62 100644
--- a/src/common/baseplatform.ts
+++ b/src/common/baseplatform.ts
@@ -12,10 +12,11 @@ import { Probeable, RasterFrameBased, AcceptsPaddleInput } from "./devices";
 import { SampledAudio } from "./audio";
 import { ProbeRecorder } from "./recorder";
 import { BaseWASMMachine } from "./wasmplatform";
+import { CPU6809 } from "./cpu/6809";
 
 ///
 
-declare var jt, CPU6809;
+declare var jt;
 
 export interface OpcodeMetadata {
   minCycles: number;
@@ -636,7 +637,7 @@ export function getToolForFilename_6809(fn:string) : string {
 export abstract class Base6809Platform extends BaseZ80Platform {
 
   newCPU(membus : MemoryBus) {
-    var cpu = new CPU6809();
+    var cpu = Object.create(CPU6809());
     cpu.init(membus.write, membus.read, 0);
     return cpu;
   }
@@ -646,7 +647,7 @@ export abstract class Base6809Platform extends BaseZ80Platform {
   }
   disassemble(pc:number, read:(addr:number)=>number) : DisasmLine {
     // TODO: don't create new CPU
-    return new CPU6809().disasm(read(pc), read(pc+1), read(pc+2), read(pc+3), read(pc+4), pc);
+    return Object.create(CPU6809()).disasm(read(pc), read(pc+1), read(pc+2), read(pc+3), read(pc+4), pc);
   }
   getDefaultExtension() : string { return ".asm"; };
   //this.getOpcodeMetadata = function() { }
diff --git a/src/common/cpu/6809.js b/src/common/cpu/6809.ts
similarity index 99%
rename from src/common/cpu/6809.js
rename to src/common/cpu/6809.ts
index d90ff16a..e7ab7200 100644
--- a/src/common/cpu/6809.js
+++ b/src/common/cpu/6809.ts
@@ -22,7 +22,7 @@ IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
-var CPU6809 = function() {
+export function CPU6809() {
 
 var ticks;
 var rA,rB,rX,rY,rU,rS,PC,CC,DP,
@@ -124,17 +124,17 @@ var PUSHWU = function(b) {
     byteTo(--rU, b & 0xff);
     byteTo(--rU, (b>>8) & 0xff);
 };
-var PULLB = function(b) {
+var PULLB = function() {
     return byteAt(rS++);
 };
-var PULLW = function(b) {
+var PULLW = function() {
     return byteAt(rS++) * 256 + byteAt(rS++);
 };
 
-var PULLBU = function(b) {
+var PULLBU = function() {
     return byteAt(rU++);
 };
-var PULLWU = function(b) {
+var PULLWU = function() {
     return byteAt(rU++) * 256 + byteAt(rU++);
 };
 
@@ -2237,8 +2237,8 @@ var disasm = function(i,a,b,c,d,pc) {
         }
         i=a;a=b;b=c;c=d;
       }
-      var bytes = sx[0];
-      var mode = sx[1];
+      var bytes = sx[0] as number;
+      var mode = sx[1] as number;
       var mnemo = sx[2];
 
       switch (mode) {
diff --git a/src/ide/ui.ts b/src/ide/ui.ts
index 69f4ef27..9f783535 100644
--- a/src/ide/ui.ts
+++ b/src/ide/ui.ts
@@ -2001,6 +2001,7 @@ function isLandscape() {
 
 async function showWelcomeMessage() {
   if (userPrefs.shouldCompleteTour()) {
+    await loadScript('lib/bootstrap-tourist.js');
     var is_vcs = platform_id.startsWith('vcs');
     var steps = [
         {
diff --git a/test/cli/testplatforms.js b/test/cli/testplatforms.js
index ddb181e6..e40cb340 100644
--- a/test/cli/testplatforms.js
+++ b/test/cli/testplatforms.js
@@ -5,7 +5,7 @@ var wtu = require('./workertestutils.js');
 var PNG = require('pngjs').PNG;
 
 const dom = createTestDOM();
-includeInThisContext('src/common/cpu/6809.js');
+includeInThisContext('gen/common/cpu/6809.js');
 includeInThisContext("javatari.js/release/javatari/javatari.js");
 Javatari.AUTO_START = false;
 includeInThisContext('tss/js/Log.js');