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Only allow instantaneous IRQ when toggling IRQ completely.

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This commit is contained in:
Brandon Wright 2019-01-18 18:29:51 -06:00
parent 0e559cd046
commit d1e078e570
1 changed files with 7 additions and 1 deletions
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8
ppu.cpp
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@ -1381,7 +1381,13 @@ void S9xSetCPU (uint8 Byte, uint16 Address)
} }
if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30)) if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30))
S9xUpdateIRQPositions(true); {
// Only allow instantaneous IRQ if turning it completely on or off
if ((Byte & 0x30) == 0 || (Memory.FillRAM[0x4200] & 0x30) == 0)
S9xUpdateIRQPositions(true);
else
S9xUpdateIRQPositions(false);
}
// NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard. // NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard.
if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) && if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) &&