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Merge pull request #802 from bladeoner/ppu
Backport Only allow instantaneous IRQ when toggling IRQ completely
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commit
8640ba22a4
@ -1382,7 +1382,13 @@ void S9xSetCPU (uint8 Byte, uint16 Address)
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}
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if ((Byte & 0x30) != (Memory.FillRAM[0x4200] & 0x30))
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S9xUpdateIRQPositions(true);
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{
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// Only allow instantaneous IRQ if turning it completely on or off
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if ((Byte & 0x30) == 0 || (Memory.FillRAM[0x4200] & 0x30) == 0)
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S9xUpdateIRQPositions(true);
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else
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S9xUpdateIRQPositions(false);
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}
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// NMI can trigger immediately during VBlank as long as NMI_read ($4210) wasn't cleard.
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if ((Byte & 0x80) && !(Memory.FillRAM[0x4200] & 0x80) &&
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