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(docastle) timing is everything

This commit is contained in:
dinkc64 2015-09-01 11:29:31 +00:00
parent a0fd2a2027
commit aab425723b
1 changed files with 7 additions and 4 deletions
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11
src/burn/drv/pre90s/d_docastle.cpp
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@ -449,7 +449,6 @@ static void shared0w(UINT8 offs, UINT8 data)
static void shared1w(UINT8 offs, UINT8 data)
{
if (offs == 8) {
ZetRunEnd();
cpu0idle = 1;
}
DrvSharedRAM1[offs] = data;
@ -971,14 +970,16 @@ static INT32 DrvFrame()
// we need a very high interleave here to sync the cpu's -or- dips & music/sfx won't work
INT32 nInterleave = 256*16; // why don't we just go single-cycle? -dink *kidding*
INT32 nCyclesTotal[3] = { 4000000 / 60, 4000000 / 60, 4000000 / 60 };
INT32 nIdleCycles = 0;
for (INT32 i = 0; i < nInterleave; i++) {
ZetOpen(0);
if (cpu0idle) {
nIdleCycles += nCyclesTotal[0] / nInterleave;
ZetIdle(nCyclesTotal[0] / nInterleave);
} else {
ZetRun(nCyclesTotal[0] / nInterleave);
ZetRun((nCyclesTotal[0] / nInterleave) + nIdleCycles);
nIdleCycles = 0;
}
if (i == ( nInterleave - 1)) ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
ZetClose();
@ -988,10 +989,12 @@ static INT32 DrvFrame()
if ((i % (nInterleave / 8)) == ((nInterleave / 8) - 1)) ZetSetIRQLine(0, CPU_IRQSTATUS_HOLD);
ZetClose();
ZetOpen(2);
#if 0
ZetOpen(2); // this z80 drives the crt controller, useless for emulation
ZetRun(nCyclesTotal[2] / nInterleave);
if (i == (nInterleave - 1)) ZetNmi();
ZetClose();
#endif
}
if (pBurnSoundOut) {