allow IE9 (not tested on IE9, OK on firefox and chrome, IE8)

detect IE, add page of browser trouble, static image
remove page Offsets to fix probing in scrolled browser window
2025-07-11 18:24:10 +00:00 · 2010-09-20 13:09:15 +00:00 · 2010-09-20 12:37:15 +00:00 · 2010-09-19 18:27:48 +00:00 · 2010-09-19 03:02:26 -04:00 · 2010-09-18 19:59:41 -04:00
15 changed files with 13177 additions and 12821 deletions
--- a/.gitattributes
+++ b/.gitattributes
@ -0,0 +1,4 @@
+* text=auto
+*.js text
+*.css text
+*.html text
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,5 @@
+# emacs-style backup files
+*~
+# patch detritus
+*.orig
+*.rej
--- a/10
+++ b/10
@ -0,0 +1,10 @@
+This is the javascript simulator from the visual5602.org project:
+www.visual6502.org/JSSim
+
+It includes a general purpose transistor-level simulator, layout browser,
+and the data from a 6502 revD chip. 
+
+Note the various licenses and Copyright associated with each file.
+
+Enjoy!
+- The Visual 6502 Team
--- a/browsertrouble.html
+++ b/browsertrouble.html
@ -0,0 +1,33 @@
+<!DOCTYPE html>
+
+<head>
+<title>Visual 6502 in JavaScript</title>
+<style type="text/css">@import "wires.css";</style>
+</head>
+
+<body>
+<span id="title"><a href="http://visual6502.org">The Visual 6502</a></span>
+<span id="plain">
+<br />
+<span id="title">Browser Trouble?</span>
+<br />
+<a href="http://www.visual6502.org/faq.html">FAQ</a>&nbsp;
+<a href="http://blog.visual6502.org">Blog</a>&nbsp;
+<a href="http://www.visual6502.org/links.html">Links</a>&nbsp 
+<p>
+Our chip simulator makes heavy use of the latest version of HTML5 drawing technology.
+<p>
+It will only run on recent browsers and on a computer with sufficient memory (we recommend at least 2Gbytes.)
+<p>
+We've tested it on Chrome, Firefox, Safari and Opera. Unfortunately Internet Explorer isn't yet capable of running the graphics.
+<p>
+If you're using one of the above browsers and having trouble, please restart the browser.
+<p>
+If you have a problem report or you're able to help us with compatilibity, please get in touch - our contact details are on the main page.
+<p>
+In the meantime, here's a picture of what you're missing:
+<p>
+<a href="http://visual6502.org"><img src="images/jssim2.png" style="border:10px"></a>
+</span>
+</body>
+</html>
--- a/chipsim.js
+++ b/chipsim.js
@ -21,6 +21,8 @@
 */

 var ctrace = false;
+var noGraphics = false;
+var loglevel = 3;
 var ridx = 0;

 function recalcNodeList(list){
@ -33,7 +35,7 @@ function recalcNodeList(list){
 		list = recalclist;
 		recalclist = new Array();
 	}
-	console.log(n,'looping...');
+	if(ctrace) console.log(n,'looping...');
 }

 function recalcNode(node, recalclist){
@ -129,7 +131,7 @@ function getNodeValue(group){
 		if((n.state=='fl')&&(flstate==undefined)) flstate = 'fl';
 		if(n.state=='fh') flstate = 'fh';
 	}
-	if(flstate==undefined) console.log(group);
+	if(flstate==undefined && ctrace) console.log(group);
 	return flstate;
 }

--- a/images/jssim2.png
+++ b/images/jssim2.png
--- a/index.html
+++ b/index.html
@ -1,7 +1,7 @@
 <!DOCTYPE html>

 <head>
-<title>6502</title>
+<title>Visual 6502 in JavaScript</title>
 <style type="text/css">@import "wires.css";</style>
 <script src="segdefs.js"></script>
 <script src="transdefs.js"></script>
@ -10,27 +10,75 @@
 <script src="chipsim.js"></script>
 <script src="memtable.js"></script>
 <script src="macros.js"></script>
+
+<script type="text/javascript">
+function handleOnload() {
+       if((navigator.appName == 'Microsoft Internet Explorer') && (parseInt(navigator.appVersion,10)<9)){
+           document.getElementById('browsertrouble').innerHTML=
+             '<p>Sorry, '+navigator.appName+' not supported - showing you a picture instead!</p>';
+           document.getElementById('frame').innerHTML='<a href="browsertrouble.html"><img src="images/jssim2.png" style="border:10px"></a>';
+       }else{
+           setTimeout(setup,200);
+       }
+}
+</script>
+
 </head>

-<body onload="setup();">
-<p class="title">The 6502</p>
+<body onload="handleOnload();">
+<br />
+<span id="title"><a href="http://visual6502.org">The Visual 6502</a></span>
+<span id="plain">
+<br />
+<a href="http://www.visual6502.org/faq.html">FAQ</a>&nbsp;
+<a href="http://blog.visual6502.org">Blog</a>&nbsp;
+<a href="http://www.visual6502.org/links.html">Links</a>&nbsp
+<br /><br />
+This simulator uses HTML5 features only found on the latest versions of browsers and needs
+lots of RAM. If you have trouble, please <a href="browsertrouble.html">check compatibility.</a>
+<br />
+<span id="browsertrouble"></span>
+<br />
+Hit '>' to zoom in, '<' to zoom out
+<br />
+Right-click to scroll around
+<br />
+Enter your own program into the array of RAM
+<br />
+<br /> 
+</span>
 <div class="frame" id="frame">
-<div class="chip">
+<div class="chip" id="chip">
 <canvas class="chip" id="chipbg"></canvas>
 <canvas class="chip" id="overlay"></canvas>
 <canvas class="chip" id="hilite"></canvas>
 <canvas class="chip" id="hitbuffer"></canvas>
 </div>
 <div class = "buttons">
-<a href ="javascript:stopChip()"id="stop"><img class="navstop" src="images/stop.png"></a>
-<a href ="javascript:runChip()" id="start"><img class="navplay" src="images/play.png"></a>
-<a href ="javascript:resetChip()"><img class="navbutton" src="images/up.png"></a>
-<a href ="javascript:stepBack()"><img class="navbutton" src="images/prev.png"></a>
-<a href ="javascript:stepForward()"><img class="navbutton" src="images/next.png"></a>
+  <div style="position:relative; float:left;">
+    <a href ="javascript:stopChip()"id="stop"><img class="navstop" src="images/stop.png"></a>
+    <a href ="javascript:runChip()" id="start"><img class="navplay" src="images/play.png"></a>
+  </div>
+  <div style="float:left;">
+    <a href ="javascript:resetChip()"><img class="navbutton" src="images/up.png"></a>
+    <a href ="javascript:stepBack()"><img class="navbutton" src="images/prev.png"></a>
+    <a href ="javascript:stepForward()"><img class="navbutton" src="images/next.png"></a>
+  </div>
 </div>
 <p class="status" id="status">x: 0<br>y: 0</p>
 <table class="memtable" id="memtable"></table>
 </div>
+<div id="updateShow"> Show:
+  <input type="checkbox" name="0" id="updateShow0" onchange="updateShow(this.name,this.checked)" />(metal)
+  <input type="checkbox" name="1" id="updateShow1" onchange="updateShow(this.name,this.checked)" />(switched diffusion)
+  <input type="checkbox" name="3" id="updateShow3" onchange="updateShow(this.name,this.checked)" />(grounded diffusion)
+  <input type="checkbox" name="4" id="updateShow4" onchange="updateShow(this.name,this.checked)" />(powered diffusion)
+  <input type="checkbox" name="5" id="updateShow5" onchange="updateShow(this.name,this.checked)" />(polysilicon)
+  <input type="checkbox" name="2" id="updateShow2" onchange="updateShow(this.name,this.checked)" />(diode)
+</div>
+<br />
+<br />
+In addition to this JavaScript project, see our <a href="../python6502.html">Python-based simulator</a> which may be easier to customize, verify, and apply to the study of long programs.<br />
+<br />
 </body>
-
 </html>
--- a/macros.js
+++ b/macros.js
@ -39,11 +39,55 @@ function go(n){
 }

 function steps(){
-	if(running) step();
-	setTimeout(steps, 200);
+	if(running) {
+           step();
+	   setTimeout(steps, 0); // schedule the next poll
+        }
 }

+function testNMI(n){
+        initChip();
+
+        mWrite(0x0000, 0x38); // set carry
+        mWrite(0x0001, 0x4c); // jump to test code
+        mWrite(0x0002, 0x06);
+        mWrite(0x0003, 0x23);
+
+        mWrite(0x22ff, 0x38); // set carry
+        mWrite(0x2300, 0xea);
+        mWrite(0x2301, 0xea);
+        mWrite(0x2302, 0xea);
+        mWrite(0x2303, 0xea);
+        mWrite(0x2304, 0xb0); // branch carry set to self
+        mWrite(0x2305, 0xfe);
+
+        mWrite(0x2306, 0xb0); // branch carry set to self
+        mWrite(0x2307, 0x01);
+        mWrite(0x2308, 0x00); // brk should be skipped
+        mWrite(0x2309, 0xa9); // anything
+        mWrite(0x230a, 0xde); // anything
+        mWrite(0x230b, 0xb0); // branch back with page crossing
+        mWrite(0x230c, 0xf2);
+
+        mWrite(0xc018, 0x40); // nmi handler
+
+        mWrite(0xfffa, 0x18); // nmi vector
+        mWrite(0xfffb, 0xc0);
+        mWrite(0xfffc, 0x00); // reset vector
+        mWrite(0xfffd, 0x00);
+
+        for(var i=0;i<n;i++){step();}
+        setLow('nmi');
+        chipStatus();
+        for(var i=0;i<8;i++){step();}
+        setHigh('nmi');
+        chipStatus();
+        for(var i=0;i<16;i++){step();}
+}
+
+
 function initChip(){
+        var start = now();
 	for(var nn in nodes) nodes[nn].state = 'fl';
 	nodes[ngnd].state = 'gnd';
 	nodes[npwr].state = 'vcc';
@ -55,11 +99,12 @@ function initChip(){
 	recalcNodeList(allNodes()); 
 	for(var i=0;i<8;i++){setHigh('clk0'), setLow('clk0');}
 	setHigh('res');
-	for(var i=0;i<14;i++){step();}
+	for(var i=0;i<18;i++){resetStep();}
 	refresh();
 	cycle = 0;
 	trace = Array();
 	chipStatus();
+	if(ctrace)console.log('initChip done after', now()-start);
 }

 function step(){
@ -76,6 +121,12 @@ function halfStep(){
 	refresh();
 }

+function resetStep(){
+	var clk = isNodeHigh(nodenames['clk0']);
+	if (clk) {setLow('clk0'); handleBusRead(); }
+	else {setHigh('clk0'); handleBusWrite();}
+}
+
 function handleBusRead(){
 	if(isNodeHigh(nodenames['rw'])) writeDataBus(mRead(readAddressBus()));
 }
@ -95,8 +146,26 @@ function readA(){return readBits('a', 8);}
 function readY(){return readBits('y', 8);}
 function readX(){return readBits('x', 8);}
 function readP(){return readBits('p', 8);}
+function readPstring(){
+   var result;
+   result = (isNodeHigh(nodenames['p7'])?'N':'n') +
+            (isNodeHigh(nodenames['p6'])?'V':'v') +
+            '-' +
+            (isNodeHigh(nodenames['p3'])?'B':'b') +
+            (isNodeHigh(nodenames['p3'])?'D':'d') +
+            (isNodeHigh(nodenames['p2'])?'I':'i') +
+            (isNodeHigh(nodenames['p1'])?'Z':'z') +
+            (isNodeHigh(nodenames['p0'])?'C':'c');
+   return result;
+}
 function readSP(){return readBits('s', 8);}
+function readPC(){return (readBits('pch', 8)<<8) + readBits('pcl', 8);}
+function readPCL(){return readBits('pcl', 8);}
+function readPCH(){return readBits('pch', 8);}

+function readBit(name){
+        return isNodeHigh(nodenames[name])?1:0;
+}
 function readBits(name, n){
 	var res = 0;
 	for(var i=0;i<n;i++){
@ -144,6 +213,7 @@ function runChip(){
 	start.style.visibility = 'hidden';
 	stop.style.visibility = 'visible';
 	running = true;
+        steps();
 }

 function stopChip(){
@ -156,7 +226,8 @@ function stopChip(){

 function resetChip(){
 	stopChip();
-	initChip();
+        setStatus('resetting 6502...');                          
+	setTimeout(initChip,0);
 }

 function stepForward(){
@ -174,17 +245,40 @@ function stepBack(){
 }

 function chipStatus(){
-	var pc = readAddressBus();
-	setStatus('PC:', hexWord(pc),
-	          'D:', hexByte(readDataBus()), 
-	          'SP:',hexByte(readSP()),
-	          'cycle:', cycle, '<br>',
-	          'A:', hexByte(readA()),
-	          'X:', hexByte(readX()),
-	          'Y:', hexByte(readY()),
-	          'P:', hexByte(readP())
-	          );
-	selectCell(pc);
+	var ab = readAddressBus();
+	var machine1 =
+	        ' halfcyc:' + cycle +
+	        ' phi0:' + readBit('clk0') +
+                ' AB:' + hexWord(ab) +
+	        ' D:' + hexByte(readDataBus()) +
+	        ' RnW:' + readBit('rw');
+	var machine2 =
+	        ' PC:' + hexWord(readPC()) +
+	        ' A:' + hexByte(readA()) +
+	        ' X:' + hexByte(readX()) +
+	        ' Y:' + hexByte(readY()) +
+	        ' SP:' + hexByte(readSP()) +
+	        ' ' + readPstring();
+	var machine3 =
+	        ' Sync:' + readBit('sync')
+		' IRQ:' + readBit('irq') +
+	        ' NMI:' + readBit('nmi');
+	var machine4 =
+	        ' IR:' + hexByte(255 - readBits('notir', 8)) +
+	        ' idl:' + hexByte(255 - readBits('idl', 8)) +
+	        ' alu:' + hexByte(255 - readBits('alu', 8)) +
+	        ' TCstate:' + readBit('clock1') + readBit('clock2') +
+                	readBit('t2') + readBit('t3') + readBit('t4') + readBit('t5');
+        var machine5 =
+                ' notRdy0:' + readBit('notRdy0') +
+                ' fetch:'   + readBit('fetch') +
+                ' clearIR:' + readBit('clearIR') +
+                ' D1x1:'    + readBit('D1x1');
+        setStatus(machine1 + "<br>" + machine2);
+	if (loglevel>2 && ctrace) {
+		console.log(machine1 + " " + machine2 + " " + machine3 + " " + machine4 + " " + machine5);
+	}
+	selectCell(ab);
 }

 function getMem(){
--- a/nodenames.js
+++ b/nodenames.js
@ -29,6 +29,14 @@ db5: 175,
 db4: 1393,
 db7: 1349,
 db6: 1591,
+idl0: 116,
+idl1: 576,
+idl2: 1485,
+idl3: 1284,
+idl4: 1516,
+idl5: 498,
+idl6: 1537,
+idl7: 529,
 a1: 1234,
 ab1: 451,
 ab2: 1340,
@ -67,6 +75,14 @@ s7: 1435,
 s6: 1212,
 s5: 1098,
 s4: 1702,
+nots0: 418,
+nots1: 1064,
+nots2: 752,
+nots3: 828,
+nots4: 1603,
+nots5: 601,
+nots6: 1029,
+nots7: 181,
 rw: 1156,
 x2: 1,
 x3: 1648,
@ -113,5 +129,81 @@ y5: 615,
 y4: 989,
 y7: 843,
 y6: 115,
-cclk: 943
+cclk: 943,   // aka cp2
+clock1: 156,
+clock2: 1536,
+notir7: 1320,
+notir6: 895,   // OK
+notir5: 1394,  // OK
+notir4: 26,
+notir3: 1125,  
+notir2: 1182,  
+notir1: 702,
+notir0: 194,
+t2: 971,
+t3: 1567,
+t4: 690,
+t5: 909,
+cp1: 710,
+fetch: 879,
+clearIR: 1077,
+D1x1: 827,
+notRdy0: 248,
+alu0: 394,
+alu1: 697,
+alu2: 276,
+alu3: 495,
+alu4: 1490,
+alu5: 893,
+alu6: 68,
+alu7: 1123,
+adl0: 413,
+adl1: 1282,
+adl2: 1242,
+adl3: 684,
+adl4: 1437,
+adl5: 1630,
+adl6: 121,
+adl7: 1299,
+adh0: 407,
+adh1: 52,
+adh2: 1651,
+adh3: 315,
+adh4: 1160,
+adh5: 483,
+adh6: 13,
+adh7: 1539,
+sb0: 54,
+sb1: 1150,
+sb2: 1287,
+sb3: 1188,
+sb4: 1405,
+sb5: 166,
+sb6: 1336,
+sb7: 1001,
+idb0: 1108,
+idb1: 991,
+idb2: 1473,
+idb3: 1302,
+idb4: 892,
+idb5: 1503,
+idb6: 833,
+idb7: 493,
+dor0: 222,
+dor1: 527,
+dor2: 1288,
+dor3: 823,
+dor4: 873,
+dor5: 1266,
+dor6: 1418,
+dor7: 158,
+pd0: 758,
+pd1: 361,
+pd2: 955,
+pd3: 894,
+pd4: 369,
+pd5: 829,
+pd6: 1669,
+pd7: 1690,
+h1x1: 1042, // drive status byte onto databus
 }
--- a/segdefs.js
+++ b/segdefs.js
@ -1,3 +1,14 @@
+/*
+ Copyright (c) 2010 Greg James, Brian Silverman, Barry Silverman
+
+ The following is provided under terms of the Creative Commons
+ Attribution-NonCommercial-ShareAlike 3.0 Unported license:
+ http://creativecommons.org/licenses/by-nc-sa/3.0/
+
+ Specify the original author as Greg James and the following URL
+ for original source material:  www.visual6502.org
+*/
+
 var segdefs = [
 [   0,'+',1,5391,8260,5391,8216,5357,8216,5357,8260],
 [   0,'+',1,5391,7919,5391,7873,5356,7873,5356,7919],
--- a/transdefs.js
+++ b/transdefs.js
@ -1,3 +1,14 @@
+/*
+ Copyright (c) 2010 Greg James, Brian Silverman, Barry Silverman
+
+ The following is provided under terms of the Creative Commons
+ Attribution-NonCommercial-ShareAlike 3.0 Unported license:
+ http://creativecommons.org/licenses/by-nc-sa/3.0/
+
+ Specify the original author as Greg James and the following URL
+ for original source material:  www.visual6502.org
+*/
+
 var transdefs = [
 ['t0', 357, 558, 217],
 ['t1', 1608, 657, 349],
--- a/wires.css
+++ b/wires.css
@ -1,8 +1,31 @@
+/*
+ Copyright (c) 2010 Brian Silverman, Barry Silverman
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER 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.
+*/
+
 body {
 background: white;
 color: black;
- font-family: cursive;
- font-size: 30px;
+/* font-family: cursive;*/
+ font-family :Verdana, Arial, Helvetica, Sans-Serif;
+ font-size: 12px;
 }

 div.frame {
@ -42,27 +65,30 @@ p.status {
 }

 img.navbutton{
- margin-left: -5px;
 border: 0px;
 }

 img.navplay{
- margin-left: -5px;
+ position: relative;
+ margin-right: 5px;
 border: 0px;
 }

 img.navstop{
 position: absolute;
- left: -5px;
- top: 9px;
 border: 0px;
 }

 table.memtable {
 position: absolute;
- top: 63px;
+ top: 78px;
 left: 820px;
 font-family: monospace;
 font-size: 12px;
 border-spacing: 0px;
 }
+
+#title {
+font-size:30px;
+font-weight:bold;	
+}
--- a/wires.js
+++ b/wires.js
@ -26,8 +26,11 @@ var zoom=1;
 var dragMouseX, dragMouseY, moved;
 var statbox;

-var colors = ['rgba(128,128,128,0.4)','#FFFF00','#FF00FF','#4DFF4D',
+// Index of layerNames corresponds to index into drawLayers
+var layernames = ['metal', 'switched diffusion', 'inputdiode', 'grounded diffusion', 'powered diffusion', 'polysilicon'];
+var colors = ['rgba(128,128,192,0.4)','#FFFF00','#FF00FF','#4DFF4D',
              '#FF4D4D','#801AC0','rgba(128,0,255,0.75)'];
+var drawlayers = [true, true, true, true, true, true];
              
 var nodes = new Array();
 var transistors = {};
@ -42,11 +45,19 @@ var npwr = nodenames['vcc'];
 //
 /////////////////////////

+// try to present a meaningful page before starting expensive work
 function setup(){
+	statbox = document.getElementById('status');
+	setStatus('loading 6502...');
+	setTimeout(setup_part2, 0);
+}
+
+function setup_part2(){
 	frame = document.getElementById('frame');
 	statbox = document.getElementById('status');
 	setupNodes();
 	setupTransistors();
+	setupLayerVisibility();
 	setupBackground();
 	setupOverlay();
 	setupHilite();
@ -56,6 +67,11 @@ function setup(){
 	setupTable();
 	window.onkeypress = function(e){handleKey(e);}
 	hilite.onmousedown = function(e){mouseDown(e);}
+	setStatus('resetting 6502...');
+	setTimeout(setup_part3, 0);
+}
+
+function setup_part3(){
 	initChip();
 	document.getElementById('stop').style.visibility = 'hidden';
 	go();
@ -89,6 +105,14 @@ function setupTransistors(){
 	}
 }

+function setupLayerVisibility(){
+	var x=document.getElementById('updateShow');
+	for (var i=0;i<x.childNodes.length;i++) {
+		if(x.childNodes[i].type='checkbox'){
+			x.childNodes[i].checked=drawlayers[x.childNodes[i].name];
+		}
+	}
+}

 function setupBackground(){
 	chipbg = document.getElementById('chipbg');
@ -100,16 +124,16 @@ function setupBackground(){
 	ctx.strokeStyle = 'rgba(255,255,255,0.5)';
 	ctx.lineWidth = 4;
 	ctx.fillRect(0,0,10000,10000);
-	var start = now();
 	for(var i in segdefs){
 		var seg = segdefs[i];
 		var c = seg[2];
+		if (drawlayers[c]) {
 			ctx.fillStyle = colors[c];
 			drawSeg(ctx, segdefs[i].slice(3));
 			ctx.fill();
 			if((c==0)||(c==6)) ctx.stroke();
 		}
-	// console.log('time to draw: ', now() - start, ' ms');
+	}		
 }

 function setupOverlay(){
@ -189,6 +213,7 @@ function hiliteNode(n){


 function drawSeg(ctx, seg){
+	if(noGraphics) return;
 	var dx = 400;
 	ctx.beginPath();
 	ctx.moveTo(seg[0]+dx, 10000-seg[1])
@ -288,6 +313,11 @@ function findNodeNumber(x,y){
 	return (high<<8)+(mid<<4)+low;
 }

+function updateShow(layer, on){
+	drawlayers[layer]=on;
+	setupBackground();
+}
+
 /////////////////////////
 //
 // Etc.
@ -305,21 +335,11 @@ function setChipStyle(props){


 function localx(el, gx){
-	var lx = gx+window.pageXOffset;
-	while(el.offsetLeft!=undefined){
-		lx-=el.offsetLeft+el.clientLeft;
-		el = el.parentNode;
-	}
-	return lx;
+	return gx-el.getBoundingClientRect().left;
 }

 function localy(el, gy){
-	var ly = gy+window.pageYOffset;
-	while(el.offsetTop!=undefined){
-		ly-=el.offsetTop+el.clientTop;
-		el = el.parentNode;
-	}
-	return ly;
+	return gy-el.getBoundingClientRect().top;
 }

 function setStatus(){
Author	SHA1	Message	Date
BigEd	9477ea64b4	allow IE9 (not tested on IE9, OK on firefox and chrome, IE8)	2010-09-20 13:09:15 +00:00
BigEd	7ef9dc4c43	detect IE, add page of browser trouble, static image	2010-09-20 12:37:15 +00:00
BigEd	efddb36049	remove page Offsets to fix probing in scrolled browser window	2010-09-19 18:27:48 +00:00
Barry Silverman	ef88fdeb90	Fixed console references for Firefox	2010-09-19 03:02:26 -04:00
Barry Silverman	470080015d	Change title font and various wording changes from Greg	2010-09-18 19:59:41 -04:00
BigEd	dccef54f2e	top link should be absolute	2010-09-18 19:37:50 +00:00
Barry Silverman	18fbd2eb36	Merge branch 'ed'	2010-09-18 14:14:05 -04:00
BigEd	bc901566e3	all layers start off visible	2010-09-18 18:06:42 +00:00
Barry Silverman	6276d019d7	Fixed localx/localy calculation	2010-09-18 14:04:52 -04:00
BigEd	69ab63e406	fixup space above memtable	2010-09-18 17:56:34 +00:00
BigEd	d032580201	improve load sequencing, add layer choosing, link to python sim, add keyboard tips, add example nmi test, tweak navbuttons, enhance chipstatus output	2010-09-18 17:46:24 +00:00
BigEd	0ecb753ec6	fixup nav button positioning	2010-09-18 17:29:45 +00:00
BigEd	e2e88cfae1	more internal busses and latches named	2010-09-18 17:25:33 +00:00
BigEd	1fd86334f7	fixup line ends on one remaining file (by touching every line...)	2010-09-18 17:12:28 +00:00
BigEd	bf2108b9d6	ignore patch detritus	2010-09-18 17:07:48 +00:00
BigEd	2d2d0ef9b6	Merge branch 'master' of git://github.com/trebonian/visual6502 Conflicts: segdefs.js	2010-09-18 17:06:09 +00:00
BigEd	3398a6f181	add copyright	2010-09-18 17:01:20 +00:00
Barry Silverman	b6d4ffda6a	More copyrights	2010-09-18 13:00:23 -04:00
Barry Silverman	6dd7e9c24e	Fixed line endings and Copyright notices	2010-09-18 12:56:48 -04:00
BigEd	51b4d8d7a0	Introduce end-of-line normalization	2010-09-18 16:38:22 +00:00
BigEd	e01093def5	ignore emacs backup files	2010-09-18 16:20:56 +00:00
BigEd	27f085b743	Merge branch 'master' of git://github.com/trebonian/visual6502	2010-09-18 16:17:54 +00:00
Barry Silverman	d3223a9478	Fixed README from Ed	2010-09-18 12:13:48 -04:00
BigEd	f8931fce49	initial README content	2010-09-18 15:59:17 +00:00
Barry Silverman	b9cbe765b2	Fix slow reset loop	2010-09-18 11:42:30 -04:00