improve load sequencing, add layer choosing, link to python sim, add keyboard tips, add example nmi test, tweak navbuttons, enhance chipstatus output
This commit is contained in:
BigEd
parent
0ecb753ec6
commit
d032580201
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@ -21,6 +21,8 @@
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*/
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var ctrace = false;
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var noGraphics = false;
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var loglevel = 3;
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var ridx = 0;
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function recalcNodeList(list){
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45
index.html
45
index.html
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@ -8,12 +8,26 @@
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<script src="nodenames.js"></script>
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<script src="wires.js"></script>
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<script src="chipsim.js"></script>
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<br>
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<script src="memtable.js"></script>
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<script src="macros.js"></script>
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</head>
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<body onload="setup();">
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<p class="title">The 6502</p>
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<body onload="setTimeout(setup,200)">
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<br />
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<span id="title"><a href="/">The Visual 6502</a></span><br /><br />
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<span id="plain">
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If the chip does not load, try another browser: Chrome, Safari, or Firefox
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<br />
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<br />
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Hit '>' to zoom in, '<' to zoom out
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<br />
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Right-click to scroll around
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<br />
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Enter your own program into the array of RAM
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<br />
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<br />
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</span>
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<div class="frame" id="frame">
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<div class="chip">
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<canvas class="chip" id="chipbg"></canvas>
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@ -22,15 +36,30 @@
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<canvas class="chip" id="hitbuffer"></canvas>
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</div>
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<div class = "buttons">
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<a href ="javascript:stopChip()"id="stop"><img class="navstop" src="images/stop.png"></a>
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<a href ="javascript:runChip()" id="start"><img class="navplay" src="images/play.png"></a>
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<a href ="javascript:resetChip()"><img class="navbutton" src="images/up.png"></a>
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<a href ="javascript:stepBack()"><img class="navbutton" src="images/prev.png"></a>
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<a href ="javascript:stepForward()"><img class="navbutton" src="images/next.png"></a>
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<div style="position:relative; float:left;">
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<a href ="javascript:stopChip()"id="stop"><img class="navstop" src="images/stop.png"></a>
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<a href ="javascript:runChip()" id="start"><img class="navplay" src="images/play.png"></a>
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</div>
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<div style="float:left;">
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<a href ="javascript:resetChip()"><img class="navbutton" src="images/up.png"></a>
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<a href ="javascript:stepBack()"><img class="navbutton" src="images/prev.png"></a>
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<a href ="javascript:stepForward()"><img class="navbutton" src="images/next.png"></a>
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</div>
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</div>
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<p class="status" id="status">x: 0<br>y: 0</p>
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<table class="memtable" id="memtable"></table>
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</div>
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<div id="updateShow"> Show:
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<input type="checkbox" name="0" id="updateShow0" onchange="updateShow(this.name,this.checked)" />(metal)
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<input type="checkbox" name="1" id="updateShow1" onchange="updateShow(this.name,this.checked)" />(diff)
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<input type="checkbox" name="2" id="updateShow2" onchange="updateShow(this.name,this.checked)" />(diode)
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<input type="checkbox" name="3" id="updateShow3" onchange="updateShow(this.name,this.checked)" />(diff0)
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<input type="checkbox" name="4" id="updateShow4" onchange="updateShow(this.name,this.checked)" />(diff1)
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<input type="checkbox" name="5" id="updateShow5" onchange="updateShow(this.name,this.checked)" />(poly)
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</div>
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<br />
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<br />
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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 />
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<br />
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</body>
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</html>
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119
macros.js
119
macros.js
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@ -39,11 +39,55 @@ function go(n){
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}
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function steps(){
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if(running) step();
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setTimeout(steps, 200);
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if(running) {
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step();
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setTimeout(steps, 0); // schedule the next poll
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}
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}
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function testNMI(n){
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initChip();
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mWrite(0x0000, 0x38); // set carry
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mWrite(0x0001, 0x4c); // jump to test code
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mWrite(0x0002, 0x06);
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mWrite(0x0003, 0x23);
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mWrite(0x22ff, 0x38); // set carry
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mWrite(0x2300, 0xea);
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mWrite(0x2301, 0xea);
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mWrite(0x2302, 0xea);
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mWrite(0x2303, 0xea);
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mWrite(0x2304, 0xb0); // branch carry set to self
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mWrite(0x2305, 0xfe);
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mWrite(0x2306, 0xb0); // branch carry set to self
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mWrite(0x2307, 0x01);
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mWrite(0x2308, 0x00); // brk should be skipped
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mWrite(0x2309, 0xa9); // anything
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mWrite(0x230a, 0xde); // anything
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mWrite(0x230b, 0xb0); // branch back with page crossing
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mWrite(0x230c, 0xf2);
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mWrite(0xc018, 0x40); // nmi handler
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mWrite(0xfffa, 0x18); // nmi vector
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mWrite(0xfffb, 0xc0);
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mWrite(0xfffc, 0x00); // reset vector
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mWrite(0xfffd, 0x00);
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for(var i=0;i<n;i++){step();}
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setLow('nmi');
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chipStatus();
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for(var i=0;i<8;i++){step();}
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setHigh('nmi');
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chipStatus();
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for(var i=0;i<16;i++){step();}
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}
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function initChip(){
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var start = now();
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for(var nn in nodes) nodes[nn].state = 'fl';
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nodes[ngnd].state = 'gnd';
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nodes[npwr].state = 'vcc';
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@ -60,6 +104,7 @@ function initChip(){
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cycle = 0;
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trace = Array();
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chipStatus();
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console.log('initChip done after', now()-start);
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}
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function step(){
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@ -78,11 +123,10 @@ function halfStep(){
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function resetStep(){
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var clk = isNodeHigh(nodenames['clk0']);
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if (clk) {setLow('clk0'); handleBusRead(); }
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if (clk) {setLow('clk0'); handleBusRead(); }
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else {setHigh('clk0'); handleBusWrite();}
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}
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function handleBusRead(){
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if(isNodeHigh(nodenames['rw'])) writeDataBus(mRead(readAddressBus()));
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}
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@ -102,8 +146,26 @@ function readA(){return readBits('a', 8);}
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function readY(){return readBits('y', 8);}
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function readX(){return readBits('x', 8);}
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function readP(){return readBits('p', 8);}
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function readPstring(){
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var result;
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result = (isNodeHigh(nodenames['p7'])?'N':'n') +
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(isNodeHigh(nodenames['p6'])?'V':'v') +
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'-' +
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(isNodeHigh(nodenames['p3'])?'B':'b') +
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(isNodeHigh(nodenames['p3'])?'D':'d') +
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(isNodeHigh(nodenames['p2'])?'I':'i') +
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(isNodeHigh(nodenames['p1'])?'Z':'z') +
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(isNodeHigh(nodenames['p0'])?'C':'c');
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return result;
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}
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function readSP(){return readBits('s', 8);}
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function readPC(){return (readBits('pch', 8)<<8) + readBits('pcl', 8);}
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function readPCL(){return readBits('pcl', 8);}
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function readPCH(){return readBits('pch', 8);}
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function readBit(name){
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return isNodeHigh(nodenames[name])?1:0;
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}
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function readBits(name, n){
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var res = 0;
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for(var i=0;i<n;i++){
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@ -151,6 +213,7 @@ function runChip(){
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start.style.visibility = 'hidden';
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stop.style.visibility = 'visible';
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running = true;
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steps();
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}
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function stopChip(){
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@ -163,7 +226,8 @@ function stopChip(){
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function resetChip(){
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stopChip();
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initChip();
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setStatus('resetting 6502...');
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setTimeout(initChip,0);
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}
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function stepForward(){
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@ -181,17 +245,40 @@ function stepBack(){
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}
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function chipStatus(){
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var pc = readAddressBus();
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setStatus('PC:', hexWord(pc),
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'D:', hexByte(readDataBus()),
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'SP:',hexByte(readSP()),
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'cycle:', cycle, '<br>',
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'A:', hexByte(readA()),
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'X:', hexByte(readX()),
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'Y:', hexByte(readY()),
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'P:', hexByte(readP())
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);
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selectCell(pc);
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var ab = readAddressBus();
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var machine1 =
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' halfcyc:' + cycle +
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' phi0:' + readBit('clk0') +
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' AB:' + hexWord(ab) +
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' D:' + hexByte(readDataBus()) +
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' RnW:' + readBit('rw');
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var machine2 =
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' PC:' + hexWord(readPC()) +
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' A:' + hexByte(readA()) +
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' X:' + hexByte(readX()) +
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' Y:' + hexByte(readY()) +
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' SP:' + hexByte(readSP()) +
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' ' + readPstring();
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var machine3 =
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' Sync:' + readBit('sync')
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' IRQ:' + readBit('irq') +
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' NMI:' + readBit('nmi');
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var machine4 =
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' IR:' + hexByte(255 - readBits('notir', 8)) +
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' idl:' + hexByte(255 - readBits('idl', 8)) +
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' alu:' + hexByte(255 - readBits('alu', 8)) +
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' TCstate:' + readBit('clock1') + readBit('clock2') +
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readBit('t2') + readBit('t3') + readBit('t4') + readBit('t5');
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var machine5 =
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' notRdy0:' + readBit('notRdy0') +
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' fetch:' + readBit('fetch') +
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' clearIR:' + readBit('clearIR') +
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' D1x1:' + readBit('D1x1');
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setStatus(machine1 + "<br>" + machine2);
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if (loglevel>2) {
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console.log(machine1 + " " + machine2 + " " + machine3 + " " + machine4 + " " + machine5);
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}
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selectCell(ab);
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}
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function getMem(){
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44
wires.js
44
wires.js
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@ -26,8 +26,10 @@ var zoom=1;
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var dragMouseX, dragMouseY, moved;
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var statbox;
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var colors = ['rgba(128,128,128,0.4)','#FFFF00','#FF00FF','#4DFF4D',
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var layernames = ['metal', 'diff', 'inputdiode', 'diff0', 'diff1', 'poly'];
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var colors = ['rgba(128,128,192,0.4)','#FFFF00','#FF00FF','#4DFF4D',
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'#FF4D4D','#801AC0','rgba(128,0,255,0.75)'];
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var drawlayers = [true, true, false, false, false, false];
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var nodes = new Array();
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var transistors = {};
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//
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/////////////////////////
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// try to present a meaningful page before starting expensive work
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function setup(){
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statbox = document.getElementById('status');
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setStatus('loading 6502...');
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setTimeout(setup_part2, 0);
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}
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function setup_part2(){
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frame = document.getElementById('frame');
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statbox = document.getElementById('status');
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setupNodes();
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setupTransistors();
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setupLayerVisibility();
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setupBackground();
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setupOverlay();
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setupHilite();
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@ -56,6 +66,11 @@ function setup(){
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setupTable();
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window.onkeypress = function(e){handleKey(e);}
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hilite.onmousedown = function(e){mouseDown(e);}
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setStatus('resetting 6502...');
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setTimeout(setup_part3, 0);
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}
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function setup_part3(){
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initChip();
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document.getElementById('stop').style.visibility = 'hidden';
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go();
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@ -89,8 +104,17 @@ function setupTransistors(){
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}
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}
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function setupLayerVisibility(){
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var x=document.getElementById('updateShow');
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for (var i=0;i<x.childNodes.length;i++) {
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if(x.childNodes[i].type='checkbox'){
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x.childNodes[i].checked=drawlayers[x.childNodes[i].name];
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}
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}
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}
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function setupBackground(){
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console.log('starting setupBackground');
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chipbg = document.getElementById('chipbg');
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chipbg.width = 4000;
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chipbg.height = 4000;
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@ -100,16 +124,16 @@ function setupBackground(){
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ctx.strokeStyle = 'rgba(255,255,255,0.5)';
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ctx.lineWidth = 4;
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ctx.fillRect(0,0,10000,10000);
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var start = now();
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for(var i in segdefs){
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var seg = segdefs[i];
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var c = seg[2];
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ctx.fillStyle = colors[c];
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drawSeg(ctx, segdefs[i].slice(3));
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ctx.fill();
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if((c==0)||(c==6)) ctx.stroke();
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if (drawlayers[c]) {
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ctx.fillStyle = colors[c];
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drawSeg(ctx, segdefs[i].slice(3));
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ctx.fill();
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if((c==0)||(c==6)) ctx.stroke();
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}
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}
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// console.log('time to draw: ', now() - start, ' ms');
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}
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function setupOverlay(){
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@ -189,6 +213,7 @@ function hiliteNode(n){
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function drawSeg(ctx, seg){
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if(noGraphics) return;
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var dx = 400;
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ctx.beginPath();
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ctx.moveTo(seg[0]+dx, 10000-seg[1])
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@ -288,6 +313,11 @@ function findNodeNumber(x,y){
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return (high<<8)+(mid<<4)+low;
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}
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function updateShow(layer, on){
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drawlayers[layer]=on;
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setupBackground();
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}
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/////////////////////////
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//
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// Etc.
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