diff --git a/demo.html b/demo.html
index 9e0765aa..a3f870d2 100644
--- a/demo.html
+++ b/demo.html
@@ -13,6 +13,13 @@
       <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
       <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
     <![endif]-->
+    <link href="https://fonts.googleapis.com/css?family=Exo" rel="stylesheet">
+<style type="text/css" media="screen">
+body {
+  font-family: 'Exo', sans-serif;
+}
+</style>
+
 <script>
 window.ga=window.ga||function(){(ga.q=ga.q||[]).push(arguments)};ga.l=+new Date;
 if (window.location.host.endsWith('8bitworkshop.com')) {
diff --git a/doc/notes.txt b/doc/notes.txt
index 34806a5b..3d5dacba 100644
--- a/doc/notes.txt
+++ b/doc/notes.txt
@@ -109,6 +109,8 @@ TODO:
   - update nested data, palette/tile refs properly
   - throw errors when bad/no refs
   - careful with mouse capture out of frame
+  - per-View keyboard shortcuts
+  - global undo
 
 WEB WORKER FORMAT
 
diff --git a/src/views.ts b/src/views.ts
index 8931504b..fc20dfd9 100644
--- a/src/views.ts
+++ b/src/views.ts
@@ -81,8 +81,9 @@ export class SourceEditor implements ProjectView {
     parent.appendChild(div);
     var asmOverride = text && this.mode=='verilog' && /__asm\b([\s\S]+?)\b__endasm\b/.test(text);
     this.newEditor(div, asmOverride);
-    if (text)
+    if (text) {
       this.setText(text); // TODO: this calls setCode() and builds... it shouldn't
+    }
     this.setupEditor();
     return div;
   }
@@ -141,8 +142,19 @@ export class SourceEditor implements ProjectView {
   }
 
   setText(text:string) {
-    this.editor.setValue(text); // calls setCode()
-    this.editor.clearHistory();
+    var i,j;
+    var oldtext = this.editor.getValue();
+    if (oldtext != text) {
+      // find minimum range to undo
+      for (var i=0; i<oldtext.length && i<text.length && text[i] == oldtext[i]; i++) { }
+      for (var j=0; j<oldtext.length && j<text.length && text[text.length-1-j] == oldtext[oldtext.length-1-j]; j++) { }
+      //console.log(i,j,oldtext.substring(i,oldtext.length-j));
+      this.replaceSelection(i, oldtext.length-j, text.substring(i, text.length-j)); // calls setCode()
+      // clear history if setting empty editor
+      if (oldtext == '') {
+        this.editor.clearHistory();
+      }
+    }
   }
 
   insertText(text:string) {
@@ -150,6 +162,11 @@ export class SourceEditor implements ProjectView {
     this.editor.replaceRange(text, cur, cur);
   }
 
+  replaceSelection(start:number, end:number, text:string) {
+    this.editor.setSelection(this.editor.posFromIndex(start), this.editor.posFromIndex(end));
+    this.editor.replaceSelection(text);
+  }
+
   getValue() : string {
     return this.editor.getValue();
   }
@@ -349,11 +366,6 @@ export class SourceEditor implements ProjectView {
     return -1;
   }
 
-  replaceSelection(start:number, end:number, text:string) {
-    this.editor.setSelection(end, start);
-    this.editor.replaceSelection(text);
-  }
-
 }
 
 ///
diff --git a/src/windows.ts b/src/windows.ts
index 98e360c0..4a450cf2 100644
--- a/src/windows.ts
+++ b/src/windows.ts
@@ -28,16 +28,24 @@ export class ProjectWindows {
     this.id2createfn[id] = createfn;
   }
 
-  createOrShow(id:string) : ProjectView {
+  create(id:string) : ProjectView {
     var wnd = this.id2window[id];
     if (!wnd) {
+      console.log("creating window",id);
       wnd = this.id2window[id] = this.id2createfn[id](id);
     }
     var div = this.id2div[id];
     if (!div) {
       var data = this.project.getFile(id)+""; // TODO: binary files
       div = this.id2div[id] = wnd.createDiv(this.containerdiv, data);
+      $(div).hide();
     }
+    return wnd;
+  }
+
+  createOrShow(id:string) : ProjectView {
+    var wnd = this.create(id);
+    var div = this.id2div[id];
     if (this.activewnd != wnd) {
       if (this.activediv)
         $(this.activediv).hide();
@@ -103,9 +111,10 @@ export class ProjectWindows {
       this.createOrShow(this.activeid);
     }
   }
-  
-  updateFile(fileid : string, data : FileData) {
-    var wnd = this.id2window[fileid];
+
+  updateFile(fileid:string, data:FileData) {
+    // is there an editor? we should create one...
+    var wnd = this.create(fileid);
     if (wnd && wnd.setText && typeof data === 'string') {
       wnd.setText(data);
     } else {
diff --git a/src/worker/workermain.ts b/src/worker/workermain.ts
index 02406dd6..a95ac440 100644
--- a/src/worker/workermain.ts
+++ b/src/worker/workermain.ts
@@ -1912,7 +1912,6 @@ function executeBuildSteps() {
     var toolfn = TOOLS[step.tool];
     if (!toolfn) throw "no tool named " + step.tool;
     step.params = PLATFORM_PARAMS[getBasePlatform(platform)];
-    console.log(step.platform + " " + step.tool);
     try {
       step.result = toolfn(step);
     } catch (e) {