otomatalabs/furnace
8
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

AY: fix timer FX on AtomicSSG

Browse source 
the bus was becoming saturated
This commit is contained in:
tildearrow 2026-01-13 02:56:26 -05:00
parent 9008fb46cc
commit 1692114deb
2 changed files with 11 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/engine/platform/ay.cpp
View file

@ -179,6 +179,7 @@ void DivPlatformAY8910::runTFX(int runRate, int advance) {
chan[i].tfx.counter += counterRatio;
if (chan[i].tfx.counter >= chan[i].tfx.period) {
chan[i].tfx.counter -= chan[i].tfx.period;
//assert(chan[i].tfx.counter < chan[i].tfx.period);
switch (chan[i].tfx.mode) {
case 0:
// pwm
@ -234,7 +235,7 @@ void DivPlatformAY8910::runTFX(int runRate, int advance) {
// YM2149 half-clock and Sunsoft 5B: timers run an octave too high
// on AtomicSSG core timers run 2 octaves too high
if (clockSel || sunsoft) chan[i].tfx.period = chan[i].tfx.period * 2;
if (selCore && !intellivision) chan[i].tfx.period = chan[i].tfx.period * 4;
//if (selCore && !intellivision) chan[i].tfx.period = chan[i].tfx.period * 4;
}
}
@ -379,8 +380,11 @@ void DivPlatformAY8910::acquire_atomic(short** buf, size_t len) {
oscBuf[i]->begin(len);
}
for (size_t i=0; i<len; i++) {
runDAC(0,1);
runTFX(0,1);
if (++atomicTFXDelay>=8) {
atomicTFXDelay=0;
runDAC(0,8);
runTFX(0,(clockSel || sunsoft)?4:2);
}
if (!writes.empty()) {
QueuedWrite w=writes.front();
@ -1066,6 +1070,8 @@ void DivPlatformAY8910::reset() {
ioPortB=false;
portAVal=0;
portBVal=0;
atomicTFXDelay=0;
}
int DivPlatformAY8910::getOutputCount() {

2
src/engine/platform/ay.h
View file

@ -128,6 +128,8 @@ class DivPlatformAY8910: public DivDispatch {
int delay;
int lastOut[2];
unsigned char atomicTFXDelay;
bool extMode;
unsigned int extClock;
int dacRate;