6502/visual6502
1
0
Fork 0
mirror of https://github.com/trebonian/visual6502.git synced 2025-04-13 03:38:20 +00:00
Code Issues Projects Releases Wiki Activity

6800: treat dbe as phi2 clock in

Browse Source
This commit is contained in:
BigEd 2011-04-01 14:40:56 +00:00
parent b0710a4cda
commit ca7124b176
1 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
chip-6800/support.js
View File

@ -14,8 +14,8 @@ nodenamereset = 'reset';
presetLogLists=[
['cycle','phi1','phi2'],
['ab','db','rw','pc','a','b'],
['ir'],
['irq','nmi',nodenamereset],
['ir','vma','ba'],
['irq','nmi',nodenamereset,'tsc','dbe','halt'],
];
function setupTransistors(){
@ -43,8 +43,8 @@ function setupTransistors(){
function halfStep(){
var clk = isNodeHigh(nodenames['phi2']);
eval(clockTriggers[cycle]);
if (clk) {setLow('phi2'); handleBusRead(); setHigh('phi1'); }
else {setHigh('phi1'); setLow('phi1'); setHigh('phi2'); handleBusWrite();}
if (clk) {setLow('phi2'); setLow('dbe'); handleBusRead(); setHigh('phi1'); }
else {setHigh('phi1'); setLow('phi1'); setHigh('phi2'); setHigh('dbe'); handleBusWrite();}
}
function initChip(){
@ -60,11 +60,16 @@ function initChip(){
nodes[npwr].float = false;
for(var tn in transistors) transistors[tn].on = false;
setLow(nodenamereset);
setHigh('phi1'); setLow('phi2');
setHigh('phi1'); setLow('phi2'); setLow('dbe');
setHigh('dbe'); setLow('tsc'); setHigh('halt');
setHigh('irq'); setHigh('nmi');
recalcNodeList(allNodes());
for(var i=0;i<8;i++){setLow('phi1'); setHigh('phi2'); setLow('phi2'); setHigh('phi1');}
for(var i=0;i<8;i++){
setLow('phi1');
setHigh('phi2'); setHigh('dbe');
setLow('phi2'); setLow('dbe');
setHigh('phi1');
}
setHigh(nodenamereset);
for(var i=0;i<18;i++){halfStep();} // avoid updating graphics and trace buffer before user code
refresh();