mirror of
https://github.com/trebonian/visual6502.git
synced 2024-12-22 12:29:20 +00:00
452 lines
12 KiB
JavaScript
452 lines
12 KiB
JavaScript
/*
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Copyright (c) 2010 Brian Silverman, Barry Silverman
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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var memory = Array();
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var cycle = 0;
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var trace = Array();
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var logstream = Array();
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var running = false;
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function loadProgram(){
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// a moderate size of static testprogram might be loaded
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if(testprogram.length!=0 && testprogramAddress != undefined)
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for(var i=0;testprogram[i]!=undefined;i++){
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var a=testprogramAddress+i;
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mWrite(a, testprogram[i]);
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if(a<0x200)
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setCellValue(a, testprogram[i]);
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}
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// a small test program or patch might be passed in the URL
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if(userCode.length!=0)
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for(var i=0;i<userCode.length;i++){
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if(userCode[i] != undefined){
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mWrite(i, userCode[i]);
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if(i<0x200)
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setCellValue(i, userCode[i]);
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}
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}
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// default reset vector will be 0x0000 because undefined memory reads as zero
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if(userResetLow!=undefined)
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mWrite(0xfffc, userResetLow);
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if(userResetHigh!=undefined)
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mWrite(0xfffd, userResetHigh);
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}
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function go(){
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if(typeof userSteps != "undefined"){
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if(--userSteps==0){
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running=false;
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userSteps=undefined;
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}
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}
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if(running) {
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step();
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setTimeout(go, 0); // schedule the next poll
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}
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}
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function goUntilSync(){
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halfStep();
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while(!isNodeHigh(nodenames['sync']) || isNodeHigh(nodenames['clk0']))
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halfStep();
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}
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function goUntilSyncOrWrite(){
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halfStep();
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while(
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!isNodeHigh(nodenames['clk0']) ||
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( !isNodeHigh(nodenames['sync']) && isNodeHigh(nodenames['rw']) )
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)
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halfStep();
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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) {
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nodes[nn].state = false;
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nodes[nn].float = true;
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}
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nodes[ngnd].state = false;
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nodes[ngnd].float = false;
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nodes[npwr].state = true;
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nodes[npwr].float = false;
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for(var tn in transistors) transistors[tn].on = false;
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setLow('res');
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setLow('clk0');
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setHigh('rdy'); setLow('so');
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setHigh('irq'); setHigh('nmi');
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recalcNodeList(allNodes());
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for(var i=0;i<8;i++){setHigh('clk0'), setLow('clk0');}
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setHigh('res');
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for(var i=0;i<18;i++){halfStep();} // avoid updating graphics and trace buffer before user code
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refresh();
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cycle = 0;
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trace = Array();
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initLogbox(signalSet(loglevel));
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chipStatus();
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if(ctrace)console.log('initChip done after', now()-start);
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}
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var logThese=[
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['cycle'],
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['ab','db','rw','sync','pc','a','x','y','s','p'],
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['ir','tcstate','pd'],
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['adl','adh','sb','alu'],
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['alucin','alua','alub','alucout','aluvout','dasb'],
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['idb','dor'],
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['irq','nmi','res'],
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];
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function signalSet(n){
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var signals=[];
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for (var i=0; (i<=n)&&(i<logThese.length) ; i++){
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for (var j=0; j<logThese[i].length; j++){
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signals.push(logThese[i][j]);
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}
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}
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return signals;
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}
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var traceChecksum='';
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var goldenChecksum;
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// simulate a single clock phase, updating trace and highlighting layout
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function step(){
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var s=stateString();
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var m=getMem();
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trace[cycle]= {chip: s, mem: m};
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if(goldenChecksum != undefined)
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traceChecksum=adler32(traceChecksum+s+m.slice(0,511).toString(16));
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halfStep();
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if(animateChipLayout)
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refresh();
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cycle++;
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chipStatus();
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}
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// simulate a single clock phase with no update to graphics or trace
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function halfStep(){
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var clk = isNodeHigh(nodenames['clk0']);
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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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function handleBusWrite(){
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if(!isNodeHigh(nodenames['rw'])){
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var a = readAddressBus();
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var d = readDataBus();
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mWrite(a,d);
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if(a<0x200) setCellValue(a,d);
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}
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}
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function readAddressBus(){return readBits('ab', 16);}
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function readDataBus(){return readBits('db', 8);}
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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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'‑' + // non-breaking hyphen
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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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var nn = nodenames[name+i];
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res+=((isNodeHigh(nn))?1:0)<<i;
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}
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return res;
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}
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function busToString(busname){
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// takes a signal name or prefix
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// returns an appropriate string representation
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if(busname=='cycle')
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return cycle>>1;
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if(busname=='pc')
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return busToHex('pch') + busToHex('pcl');
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if(busname=='p')
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return readPstring();
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if(busname=='tcstate')
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return ['clock1','clock2','t2','t3','t4','t5'].map(busToHex).join("");
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return busToHex(busname);
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}
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function busToHex(busname){
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// may be passed a bus or a signal, so allow multiple signals
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// signals may have multi-part names like pla51_T0SBC which should match either part
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// this is quite difficult to deal with, perhaps indicating that it is not such a good idea
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var width=0;
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var r=new RegExp('^' + busname + '[0-9]');
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for(var i in nodenamelist){
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if(r.test(nodenamelist[i])) {
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width++;
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}
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}
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if(width==0)
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return isNodeHigh(nodenames[busname])?"1":"0";
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if(width>16)
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return -1;
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// finally, convert from logic values to hex
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return (0x10000+readBits(busname,width)).toString(16).slice(-(width-1)/4-1);
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}
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function writeDataBus(x){
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var recalcs = Array();
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for(var i=0;i<8;i++){
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var nn = nodenames['db'+i];
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var n = nodes[nn];
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if((x%2)==0) {n.pulldown=true; n.pullup=false;}
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else {n.pulldown=false; n.pullup=true;}
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recalcs.push(nn);
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x>>=1;
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}
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recalcNodeList(recalcs);
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}
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function mRead(a){
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if(memory[a]==undefined) return 0;
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else return memory[a];
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}
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function mWrite(a, d){memory[a]=d;}
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function clkNodes(){
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var res = Array();
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res.push(943);
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for(var i in nodes[943].gates){
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var t = nodes[943].gates[i];
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if(t.c1==npwr) res.push(t.c2);
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if(t.c2==npwr) res.push(t.c1);
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}
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hiliteNode(res);
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}
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function runChip(){
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var start = document.getElementById('start');
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var stop = document.getElementById('stop');
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start.style.visibility = 'hidden';
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stop.style.visibility = 'visible';
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if(typeof running == "undefined")
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initChip();
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running = true;
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go();
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}
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function stopChip(){
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var start = document.getElementById('start');
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var stop = document.getElementById('stop');
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start.style.visibility = 'visible';
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stop.style.visibility = 'hidden';
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running = false;
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}
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function resetChip(){
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stopChip();
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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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stopChip();
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step();
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}
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function stepBack(){
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if(cycle==0) return;
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showState(trace[--cycle].chip);
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setMem(trace[cycle].mem);
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var clk = isNodeHigh(nodenames['clk0']);
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if(!clk) writeDataBus(mRead(readAddressBus()));
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chipStatus();
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}
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function chipStatus(){
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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 chk='';
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if(goldenChecksum != undefined)
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chk=" Chk:" + traceChecksum + ((traceChecksum==goldenChecksum)?" OK":" no match");
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setStatus(machine1, machine2, "Hz: " + estimatedHz().toFixed(1) + chk);
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if (loglevel>0) {
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updateLogbox(signalSet(loglevel));
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}
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selectCell(ab);
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}
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function goFor(){
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var n = headlessSteps;
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estimatedHz1();
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while(--n){
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halfStep();
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cycle++;
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}
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estimatedHz1();
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chipStatus();
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}
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var prevHzTimeStamp=0;
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var prevHzCycleCount=0;
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var prevHzEstimate1=1;
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var prevHzEstimate2=1;
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var HzSamplingRate=10;
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function estimatedHz(){
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if(cycle%HzSamplingRate!=3)
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return prevHzEstimate1;
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return estimatedHz1();
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}
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function estimatedHz1(){
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var HzTimeStamp = now();
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var HzEstimate = (cycle-prevHzCycleCount+.01)/(HzTimeStamp-prevHzTimeStamp+.01);
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HzEstimate=HzEstimate*1000/2; // convert from phases per millisecond to Hz
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if(HzEstimate<5)
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HzSamplingRate=5; // quicker
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if(HzEstimate>10)
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HzSamplingRate=10; // smoother
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prevHzEstimate2=prevHzEstimate1;
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prevHzEstimate1=(HzEstimate+prevHzEstimate1+prevHzEstimate2)/3; // wrong way to average speeds
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prevHzTimeStamp=HzTimeStamp;
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prevHzCycleCount=cycle;
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return prevHzEstimate1
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}
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function initLogbox(names){
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var logbox=document.getElementById('logstream');
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if(logbox==null)return;
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logStream = [];
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logStream.push("<td>" + names.join("</td><td>") + "</td>");
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logbox.innerHTML = "<tr>"+logStream.join("</tr><tr>")+"</tr>";
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}
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function updateLogbox(names){
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var logbox=document.getElementById('logstream');
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var signals=[];
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for(i in names){
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signals.push(busToString(names[i]));
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}
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logStream.push("<td>" + signals.join("</td><td>") + "</td>");
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logbox.innerHTML = "<tr>"+logStream.join("</tr><tr>")+"</tr>";
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}
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function getMem(){
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var res = Array();
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for(var i=0;i<0x200;i++) res.push(mRead(i));
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return res;
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}
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function setMem(arr){
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for(var i=0;i<0x200;i++){mWrite(i, arr[i]); setCellValue(i, arr[i]);}
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}
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function hexWord(n){return (0x10000+n).toString(16).substring(1)}
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function hexByte(n){return (0x100+n).toString(16).substring(1)}
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function adler32(x){
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var a=1;
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var b=0;
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for(var i=0;i<x.length;i++){
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a=(a+x.charCodeAt(i))%65521;
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b=(b+a)%65521;
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}
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return (0x100000000+(b<<16)+a).toString(16).slice(-8);
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}
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