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NES: MMC5 DAC read mode support #96

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NES: MMC5 DAC read mode support #96

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08ede09
MMC5 DAC read mode
HeeminTV May 9, 2026
db44a7c
MMC5 DAC read mode
HeeminTV May 9, 2026
0b58e4b
Reformat
HeeminTV May 10, 2026
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8 changes: 7 additions & 1 deletion Core/NES/Mappers/Audio/Mmc5Audio.h
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,12 @@ class Mmc5Audio : public BaseExpansionAudio
_pcmOutput = 0;
}

void PCMReadModeDataRead(char dacval) {
if(_pcmReadMode && dacval) {
_pcmOutput = dacval;
}
}

uint8_t ReadRegister(uint16_t addr)
{
switch(addr) {
Expand Down Expand Up @@ -139,7 +145,7 @@ class Mmc5Audio : public BaseExpansionAudio
break;

case 0x5010:
//TODO: Read mode & PCM IRQs are not implemented
//TODO: PCM IRQ
_pcmReadMode = (value & 0x01) == 0x01;
_pcmIrqEnabled = (value & 0x80) == 0x80;
break;
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8 changes: 8 additions & 0 deletions Core/NES/Mappers/Nintendo/MMC5.h
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Expand Up @@ -451,6 +451,14 @@ class MMC5 : public BaseMapper, public IExtModeMapperDebug
BaseMapper::WriteRam(addr, value);
}

uint8_t ReadRam(uint16_t addr) override
{
if((addr & 0xC000) == 0x8000) {
_audio->PCMReadModeDataRead(InternalReadRam(addr));
}
return BaseMapper::ReadRam(addr);
}

void DetectScanlineStart(uint16_t addr)
{
if(_ntReadCounter >= 2) {
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