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More 8080 improvements, including some initial "Fake CP/M" support

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This commit is contained in:
Jeff Parsons 2016-04-27 08:28:52 -07:00
commit 5b6f6756a2
25 changed files with 1051 additions and 842 deletions
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18
modules/pc8080/lib/cpuops.js
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@ -1299,23 +1299,37 @@ CPUDef.opHLT = function()
* we are signalling to stepCPU() that it's free to end the current burst AND that it should not
* execute any more instructions until checkINTR() indicates a hardware interrupt is requested.
*/
var addr = this.getPC() - 1;
/*
* If any HLT check functions are installed, call them, and if any of them return true, then
* immediately stop HLT processing.
*/
if (this.afnHalt.length) {
for (var i = 0; i < this.afnHalt.length; i++) {
if (this.afnHalt[i](addr)) return;
}
}
this.intFlags |= CPUDef.INTFLAG.HALT;
this.nStepCycles -= 7;
/*
* If a Debugger is present and the HALT message category is enabled, then we REALLY halt the CPU,
* on the theory that whoever's using the Debugger would like to see HLTs.
*/
if (DEBUGGER && this.dbg && this.messageEnabled(Messages.HALT)) {
this.setPC(this.getPC() - 1); // this is purely for the Debugger's benefit, to show the HLT
this.setPC(addr); // this is purely for the Debugger's benefit, to show the HLT
this.dbg.stopCPU();
return;
}
/*
* We also REALLY halt the machine if interrupts have been disabled, since that means it's dead
* in the water (we have no NMI generation mechanism at the moment).
*/
if (!this.getIF()) {
if (DEBUGGER && this.dbg) this.setPC(this.getPC() - 1);
if (DEBUGGER && this.dbg) this.setPC(addr);
this.stopCPU();
}
};