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Ensure all 8-bit I/O restricts itself to 8 bits (fixes video glitches in Win95 Setup)

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This commit is contained in:
Jeff Parsons 2015-08-17 10:51:50 -07:00
commit e39550f835
5 changed files with 53 additions and 31 deletions
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6
modules/pcjs/lib/chipset.js
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@ -3890,7 +3890,7 @@ ChipSet.prototype.updateTimer = function(iTimer, fCycleReset)
count = countInit;
}
timer.countStart[0] = count & 0xff;
timer.countStart[1] = count >> 8;
timer.countStart[1] = (count >> 8) & 0xff;
timer.nCyclesStart = nCycles;
if (!iTimer && timer.fOUT) {
fFired = true;
@ -3929,7 +3929,7 @@ ChipSet.prototype.updateTimer = function(iTimer, fCycleReset)
this.acTimer0Counts.push([count, nCycles, nCycleDelta]);
}
timer.countStart[0] = count & 0xff;
timer.countStart[1] = count >> 8;
timer.countStart[1] = (count >> 8) & 0xff;
timer.nCyclesStart = nCycles;
if (!iTimer && timer.fOUT) {
fFired = true;
@ -3944,7 +3944,7 @@ ChipSet.prototype.updateTimer = function(iTimer, fCycleReset)
}
timer.countCurrent[0] = count & 0xff;
timer.countCurrent[1] = count >> 8;
timer.countCurrent[1] = (count >> 8) & 0xff;
if (fCycleReset) this.nCyclesStart = 0;
}
return timer;