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Y8950 regression fix

This commit is contained in:
tildearrow 2022-09-23 23:03:07 -05:00
parent e8ca6bd483
commit 67fc945992
1 changed files with 10 additions and 0 deletions
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10
src/engine/platform/opl.cpp
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@ -508,6 +508,14 @@ void DivPlatformOPL::tick(bool sysTick) {
} else {
chan[adpcmChan].freq=0;
}
if (chan[adpcmChan].fixedFreq>0) chan[adpcmChan].freq=chan[adpcmChan].fixedFreq;
if (pretendYMU) { // YMU759 only does 4KHz or 8KHz
if (chan[adpcmChan].freq>7500) {
chan[adpcmChan].freq=10922; // 8KHz
} else {
chan[adpcmChan].freq=5461; // 4KHz
}
}
immWrite(16,chan[adpcmChan].freq&0xff);
immWrite(17,(chan[adpcmChan].freq>>8)&0xff);
if (chan[adpcmChan].keyOn || chan[adpcmChan].keyOff) {
@ -673,6 +681,7 @@ int DivPlatformOPL::dispatch(DivCommand c) {
if (skipRegisterWrites) break;
if (chan[c.chan].furnacePCM) {
chan[c.chan].macroInit(ins);
chan[c.chan].fixedFreq=0;
if (!chan[c.chan].std.vol.will) {
chan[c.chan].outVol=chan[c.chan].vol;
immWrite(18,chan[c.chan].outVol);
@ -718,6 +727,7 @@ int DivPlatformOPL::dispatch(DivCommand c) {
immWrite(11,(end>>2)&0xff);
immWrite(12,(end>>10)&0xff);
int freq=(65536.0*(double)s->rate)/(double)chipRateBase;
chan[c.chan].fixedFreq=freq;
immWrite(16,freq&0xff);
immWrite(17,(freq>>8)&0xff);
chan[c.chan].active=true;