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C64: CIA was sometimes delaying too long to fire interrupts by 1 cycle. 

- This could have implications for existing TASes (!)
This commit is contained in:
SaxxonPike 2019-07-05 23:59:01 -05:00
parent 69f8b143a3
commit 400b04b690
1 changed files with 24 additions and 25 deletions
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49
BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Cia.cs
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@ -144,34 +144,29 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
_lastCnt = true;
}
private void CheckIrqs()
{
if (_taIrqNextCycle)
{
_taIrqNextCycle = false;
TriggerInterrupt(1);
}
if (_tbIrqNextCycle)
{
_tbIrqNextCycle = false;
TriggerInterrupt(2);
}
}
public void ExecutePhase()
{
_thisCnt = ReadCnt();
_taUnderflow = false;
if (DelayedInterrupts)
{
CheckIrqs();
}
if (_taIrqNextCycle)
{
_taIrqNextCycle = false;
TriggerInterrupt(1);
}
if (_tbIrqNextCycle)
{
_tbIrqNextCycle = false;
TriggerInterrupt(2);
}
if (_taPrb6NegativeNextCycle)
{
_prb &= 0xBF;
_taPrb6NegativeNextCycle = false;
}
if (_tbPrb7NegativeNextCycle)
{
_prb &= 0x7F;
@ -277,11 +272,6 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
}
_flagLatch = _flagInput;
if (!DelayedInterrupts)
{
CheckIrqs();
}
if ((_cra & 0x02) != 0)
_ddra |= 0x40;
if ((_crb & 0x02) != 0)
@ -309,7 +299,12 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
private void Ta_Interrupt()
{
_ta = _latcha;
_taIrqNextCycle = true;
if (DelayedInterrupts)
_taIrqNextCycle = true;
else
TriggerInterrupt(1);
_icr |= 1;
if ((_cra & 0x08) != 0)
@ -418,7 +413,11 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
private void Tb_Interrupt()
{
_tb = _latchb;
_tbIrqNextCycle = true;
if (DelayedInterrupts)
_tbIrqNextCycle = true;
else
TriggerInterrupt(2);
_icr |= 2;
if ((_crb & 0x08) != 0)