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Various corrections and fixes

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Fix SN PSG pitch corrections
Revive YM2612 from dead
Add Game Gear stereo function finally
Add OPN/A prescaler config
This commit is contained in:
cam900 2022-06-17 14:30:18 +09:00
parent 0c1a8bc001
commit 25af023dc6
15 changed files with 147 additions and 99 deletions
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35
src/engine/platform/ym2203.cpp
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@ -981,6 +981,10 @@ void DivPlatformYM2203::reset() {
extMode=false;
// set prescaler
immWrite(0x2d,0xff);
immWrite(prescale,0xff);
ay->reset();
ay->getRegisterWrites().clear();
ay->flushWrites();
@ -1013,7 +1017,8 @@ void DivPlatformYM2203::setSkipRegisterWrites(bool value) {
}
void DivPlatformYM2203::setFlags(unsigned int flags) {
switch (flags&0x3f) {
// Clock flags
switch (flags&0x1f) {
default:
case 0x00:
chipClock=COLOR_NTSC;
@ -1034,10 +1039,36 @@ void DivPlatformYM2203::setFlags(unsigned int flags) {
chipClock=3000000.0/2.0;
break;
}
// Prescaler flags
switch ((flags>>5)&0x3) {
default:
case 0x00: // /6
prescale=0x2d;
fmFreqBase=4720270.0,
fmDivBase=36,
ayDiv=16;
break;
case 0x01: // /3
prescale=0x2e;
fmFreqBase=4720270.0/2.0,
fmDivBase=18,
ayDiv=8;
break;
case 0x02: // /2
prescale=0x2f;
fmFreqBase=4720270.0/3.0,
fmDivBase=12,
ayDiv=4;
break;
}
rate=fm->sample_rate(chipClock);
for (int i=0; i<6; i++) {
oscBuf[i]->rate=rate;
}
immWrite(0x2d,0xff);
immWrite(prescale,0xff);
ay->setExtClockDiv(chipClock,ayDiv);
ay->setFlags(16);
}
int DivPlatformYM2203::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
@ -1050,11 +1081,11 @@ int DivPlatformYM2203::init(DivEngine* p, int channels, int sugRate, unsigned in
}
fm=new ymfm::ym2203(iface);
fm->set_fidelity(ymfm::OPN_FIDELITY_MIN);
setFlags(flags);
// YM2149, 2MHz
ay=new DivPlatformAY8910(true,chipClock,ayDiv);
ay->init(p,3,sugRate,16);
ay->toggleRegisterDump(true);
setFlags(flags);
reset();
return 6;