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Merge pull request #54 from hoglet67/Z80

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Visual Z80: work towards interrupt support
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BigEd 2018-09-30 16:44:22 +01:00 committed by GitHub
commit 74762264c1
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2 changed files with 12 additions and 1 deletions
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4
chip-z80/nodenames.js
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@ -21,7 +21,11 @@ ab15: 20,
_reset: 21,
_wait: 22,
_int: 23,
int: 23,
_irq: 23,
irq: 23,
_nmi: 24,
nmi: 24,
_busrq: 25,
_m1: 26,
_rd: 27,

9
chip-z80/support.js
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@ -110,7 +110,14 @@ var state = 0;
var last_rd_done = 1;
function handleBusRead(){
if(!isNodeHigh(nodenames['_rd'])){
if(!isNodeHigh(nodenames['_m1']) && !isNodeHigh(nodenames['_iorq'])) {
// Interrupt acknownledge cycle, force 0xFF onto the bus
// In IM0 this is seen as RST 0x38
// In IM1 this is ignored
// In IM2 this is used as the low byte of the vector
// TODO: ideally this "vector" would be a configurable parameter
writeDataBus(0xff);
} else if(!isNodeHigh(nodenames['_rd'])){
var a = readAddressBus();
var d = eval(readTriggers[a]);
if(d == undefined)