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NES: DMAs interrupted during a write shouldn't start after the write

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Sour 2024-09-28 20:14:56 +09:00
parent de20208abe
commit efdf18dadb
1 changed files with 11 additions and 3 deletions
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14
Core/NES/NesCpu.cpp
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@ -531,9 +531,17 @@ void NesCpu::StartDmcTransfer()
void NesCpu::StopDmcTransfer()
{
if(_needHalt && _dmcDmaRunning) {
_abortDmcDma = true;
_needDummyRead = false;
if(_dmcDmaRunning) {
if(_needHalt) {
//If interrupted before the halt cycle starts, cancel DMA completely
//This can happen when a write prevents the DMA from starting after being queued
_dmcDmaRunning = false;
_needDummyRead = false;
_needHalt = false;
} else {
//Abort DMA if possible (this only appears to be possible if done within the first cycle of DMA)
_abortDmcDma = true;
}
}
}