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1942: improve sound a little

This commit is contained in:
dinkc64 2015-01-29 18:20:36 +00:00
parent 9e100eef22
commit dd0862f23b
1 changed files with 11 additions and 13 deletions
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24
src/burn/drv/pre90s/d_1942.cpp
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@ -626,8 +626,8 @@ static void MachineInit()
AY8910Init(0, 1500000, nBurnSoundRate, NULL, NULL, NULL, NULL);
AY8910Init(1, 1500000, nBurnSoundRate, NULL, NULL, NULL, NULL);
AY8910SetAllRoutes(0, 0.25, BURN_SND_ROUTE_BOTH);
AY8910SetAllRoutes(1, 0.25, BURN_SND_ROUTE_BOTH);
AY8910SetAllRoutes(0, 0.25, BURN_SND_ROUTE_BOTH); // Plane Noise/Bass/Shot
AY8910SetAllRoutes(1, 0.25, BURN_SND_ROUTE_BOTH); // Whistle/Snare
GenericTilesInit();
@ -943,7 +943,7 @@ static void DrvDraw()
static INT32 DrvFrame()
{
INT32 nInterleave = 4;
INT32 nInterleave = 8;
INT32 nSoundBufferPos = 0;
if (DrvReset) DrvDoReset();
@ -954,8 +954,6 @@ static INT32 DrvFrame()
nCyclesTotal[1] = 3000000 / 60;
nCyclesDone[0] = nCyclesDone[1] = 0;
// ZetNewFrame();
for (INT32 i = 0; i < nInterleave; i++) {
INT32 nCurrentCPU, nNext;
@ -965,13 +963,9 @@ static INT32 DrvFrame()
nNext = (i + 1) * nCyclesTotal[nCurrentCPU] / nInterleave;
nCyclesSegment = nNext - nCyclesDone[nCurrentCPU];
nCyclesDone[nCurrentCPU] += ZetRun(nCyclesSegment);
if (i == 1) {
ZetSetVector(0xcf);
ZetRaiseIrq(0);
}
if (i == 3) {
ZetSetVector(0xd7);
ZetRaiseIrq(0);
if (i == 0 || i == 7) {
ZetSetVector((i == 0) ? 0xcf : 0xd7);
ZetSetIRQLine(0, ZET_IRQSTATUS_AUTO);
}
ZetClose();
@ -982,7 +976,11 @@ static INT32 DrvFrame()
nCyclesSegment = nNext - nCyclesDone[nCurrentCPU];
nCyclesSegment = ZetRun(nCyclesSegment);
nCyclesDone[nCurrentCPU] += nCyclesSegment;
ZetRaiseIrq(0);
if (i & 1) { // 4 times per frame
ZetSetIRQLine(0, ZET_IRQSTATUS_ACK);
ZetRun(100); // needs long ack
ZetSetIRQLine(0, ZET_IRQSTATUS_NONE);
}
ZetClose();
// Render Sound Segment