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C64: Raster IRQ is edge triggered, how'd I miss this?

This commit is contained in:
SaxxonPike 2019-07-26 01:40:31 -05:00
parent 92eb569b12
commit ac52d0e5f6
3 changed files with 13 additions and 11 deletions
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2
BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Chip6510.cs
View File

@ -85,11 +85,11 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
public void ExecutePhase()
{
_cpu.RDY = ReadRdy();
_irqDelay >>= 1;
_nmiDelay >>= 1;
_irqDelay |= ReadIrq() ? 0x0 : 0x2;
_nmiDelay |= ReadNmi() ? 0x0 : 0x2;
_cpu.RDY = ReadRdy();
_cpu.IRQ = (_irqDelay & 1) != 0;
_cpu.NMI |= (_nmiDelay & 3) == 2;
_cpu.ExecuteOne();

1
BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.State.cs
View File

@ -50,6 +50,7 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
private int _pointerCb;
private int _pointerVm;
private int _rasterInterruptLine;
private bool _rasterInterruptTriggered;
private int _rasterLine;
private int _rasterX;
private bool _rasterXHold;

21
BizHawk.Emulation.Cores/Computers/Commodore64/MOS/Vic.cs
View File

@ -220,6 +220,9 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
_vc = 0;
_refreshCounter = 0xFF;
}
if (_rasterLine == BadLineDisableRaster)
_badlineEnable = false;
}
// bg collision clear
@ -242,17 +245,15 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
_spriteSpriteCollisionClearPending = false;
}
// start of rasterline
if ((_cycle == RasterIrqLineXCycle && _rasterLine > 0) || (_cycle == RasterIrqLine0Cycle && _rasterLine == 0))
// raster IRQ is edge triggered
if (_rasterInterruptLine != _rasterLine)
{
if (_rasterLine == BadLineDisableRaster)
_badlineEnable = false;
// raster compares are done here
if (_rasterLine == _rasterInterruptLine)
{
_intRaster = true;
}
_rasterInterruptTriggered = false;
}
else if (!_rasterInterruptTriggered)
{
_intRaster = true;
_rasterInterruptTriggered = true;
}
// render