diff --git a/index.html b/index.html
index 28cfb6c9..ef600ecb 100644
--- a/index.html
+++ b/index.html
@@ -522,10 +522,10 @@ function require(modname) {
 <script src="tss/js/tss/AudioLooper.js"></script>
 <script src="tss/js/Log.js"></script>
 
+<script src="gen/vlist.js"></script>
 <script src="gen/video/tms9918a.js"></script>
 <script src="gen/util.js"></script>
 <script src="gen/store.js"></script>
-<script src="src/vlist.js"></script>
 <script src="gen/emu.js"></script>
 <script src="gen/baseplatform.js"></script>
 <script src="gen/analysis.js"></script>
diff --git a/src/devices.ts b/src/devices.ts
index 3c325200..8ccd9bd6 100644
--- a/src/devices.ts
+++ b/src/devices.ts
@@ -7,7 +7,7 @@ export interface SavesState<S> {
 export interface Bus {
     read(a:number) : number;
     write(a:number, v:number) : void;
-    // TODO: readConst?(a:number) : number;
+    readConst?(a:number) : number;
 }
 
 export interface ClockBased {
@@ -89,7 +89,7 @@ export interface Interruptable<IT> {
 // TODO
 export interface AcceptsInput<CS> {
     setInput(key:number, code:number, flags:number) : void;
-    loadControlsState(cs:CS);
+    loadControlsState(cs:CS) : void;
     saveControlsState() : CS;
 }
 
diff --git a/src/vlist.js b/src/vlist.ts
similarity index 96%
rename from src/vlist.js
rename to src/vlist.ts
index 8be2b451..287f39dc 100644
--- a/src/vlist.js
+++ b/src/vlist.ts
@@ -70,7 +70,7 @@ function VirtualList(config) {
   function onScroll(e) {
     var scrollTop = e.target.scrollTop; // Triggers reflow
     if (!lastRepaintY || Math.abs(scrollTop - lastRepaintY) > maxBuffer) {
-      var first = parseInt(scrollTop / itemHeight) - screenItemsLen;
+      var first = (scrollTop / itemHeight) - screenItemsLen;
       self._renderChunk(self.container, first < 0 ? 0 : first);
       lastRepaintY = scrollTop;
     }
@@ -141,17 +141,17 @@ VirtualList.createContainer = function(w, h) {
   c.style.height = h;
   c.style.overflow = 'auto';
   c.style.position = 'relative';
-  c.style.padding = 0;
+  c.style.padding = '0';
   c.style.border = '1px solid black';
   return c;
 };
 
 VirtualList.createScroller = function(h) {
   var scroller = document.createElement('div');
-  scroller.style.opacity = 0;
+  scroller.style.opacity = '0';
   scroller.style.position = 'absolute';
-  scroller.style.top = 0;
-  scroller.style.left = 0;
+  scroller.style.top = '0';
+  scroller.style.left = '0';
   scroller.style.width = '1px';
   scroller.style.height = h + 'px';
   return scroller;