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First batch of pdp11.js code adapted but totally untested

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This commit is contained in:
Jeff Parsons 2016-09-05 11:05:40 -07:00
commit 100779e30a
22 changed files with 2697 additions and 1273 deletions
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17
modules/pc8080/lib/cpu.js
View file

@ -1035,6 +1035,17 @@ CPU8080.prototype.updateTimers = function(nCycles)
}
};
/**
* endBurst()
*
* @this {CPU8080}
*/
CPU8080.prototype.endBurst = function()
{
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0;
};
/**
* runCPU(fUpdateFocus)
*
@ -1170,8 +1181,7 @@ CPU8080.prototype.stepCPU = function(nMinCycles)
CPU8080.prototype.stopCPU = function(fComplete)
{
this.isBusy(true);
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0;
this.endBurst();
this.addCycles(this.nRunCycles);
this.nRunCycles = 0;
if (this.flags.fRunning) {
@ -1212,9 +1222,8 @@ CPU8080.prototype.updateCPU = function(fForce)
*/
CPU8080.prototype.yieldCPU = function()
{
this.endBurst(); // this will break us out of stepCPU()
this.nCyclesNextYield = 0; // this will break us out of runCPU(), once we break out of stepCPU()
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0; // this will break us out of stepCPU()
// if (DEBUG) this.nSnapCycles = this.nBurstCycles;
/*
* The Debugger calls yieldCPU() after every message() to ensure browser responsiveness, but it looks

12
modules/pc8080/lib/cpustate.js
View file

@ -961,8 +961,7 @@ CPUState8080.prototype.checkINTR = function()
* current burst AND that it should not execute any more instructions until checkINTR() indicates
* that a hardware interrupt has been requested.
*/
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0;
this.endBurst();
return false;
}
return true;
@ -994,8 +993,7 @@ CPUState8080.prototype.clearINTR = function(nLevel)
CPUState8080.prototype.requestHALT = function()
{
this.intFlags |= CPUDef8080.INTFLAG.HALT;
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0;
this.endBurst();
};
/**
@ -1015,8 +1013,7 @@ CPUState8080.prototype.requestINTR = function(nLevel)
{
this.intFlags |= (1 << nLevel);
if (this.getIF()) {
this.nBurstCycles -= this.nStepCycles;
this.nStepCycles = 0;
this.endBurst();
}
};
@ -1088,9 +1085,6 @@ CPUState8080.prototype.updateStatus = function(fForce)
* they're all one continuous stream of instructions that can be stepped or run at will. Moreover,
* stepping vs. running should never change the behavior of the simulation.
*
* As a result, the Debugger's complete independence means you can run other 8086/8088 debuggers
* (eg, DEBUG) inside the simulation without interference; you can even "debug" them with the Debugger.
*
* @this {CPUState8080}
* @param {number} nMinCycles (0 implies a single-step, and therefore breakpoints should be ignored)
* @return {number} of cycles executed; 0 indicates a pre-execution condition (ie, an execution breakpoint