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68681: work around core problem where a timer set to 0 hz locks up MAME (nw)

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This commit is contained in:
R. Belmont 2011-10-15 18:46:25 +00:00
parent 985d06663f
commit 94c7d1b32c
1 changed files with 7 additions and 0 deletions
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7
src/emu/machine/68681.c
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@ -574,6 +574,13 @@ READ8_DEVICE_HANDLER(duart68681_r)
//attotime rate = attotime::from_hz(duart68681->clock) * (16*duart68681->CTR.w.l);
attotime rate = attotime::from_hz(2*device->clock()/(2*16*16*duart68681->CTR.w.l));
//hz = ATTOSECONDS_TO_HZ(rate.attoseconds);
// workaround for maygay1b locking up MAME
if ((2*device->clock()/(2*16*16*duart68681->CTR.w.l)) == 0)
{
rate = attotime::from_hz(1);
}
duart68681->duart_timer->adjust(rate, 0, rate);
}
break;