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i186: Use cycles_to_attotime and attotime_to_cycles for timer period calculation. Gives better timings for Am188EM-based games in subsino/subsino2.cpp.

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AJR 2024-04-10 11:31:47 -04:00
parent e3e15204d0
commit 7667dde203
1 changed files with 3 additions and 3 deletions
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6
src/devices/cpu/i86/i186.cpp
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@ -1314,7 +1314,7 @@ void i80186_cpu_device::restart_timer(int which)
int count = (t->control & 0x1000) ? t->maxB : t->maxA;
if (!(t->control & 4))
t->int_timer->adjust((attotime::from_hz(clock() / 8) * (count ? count : 0x10000)), which);
t->int_timer->adjust(cycles_to_attotime(4 * (count ? count : 0x10000)), which);
}
void i80186_cpu_device::internal_timer_sync(int which)
@ -1323,7 +1323,7 @@ void i80186_cpu_device::internal_timer_sync(int which)
/* if we have a timing timer running, adjust the count */
if ((t->control & 0x8000) && !(t->control & 0x0c) && t->int_timer->enabled())
t->count = ((t->control & 0x1000) ? t->maxB : t->maxA) - t->int_timer->remaining().as_ticks(clock() / 8);
t->count = ((t->control & 0x1000) ? t->maxB : t->maxA) - attotime_to_cycles(t->int_timer->remaining()) / 4;
}
void i80186_cpu_device::inc_timer(int which)
@ -1447,7 +1447,7 @@ void i80186_cpu_device::internal_timer_update(int which, int new_count, int new_
int diff = ((t->control & 0x1000) ? t->maxB : t->maxA) - t->count;
if (diff <= 0)
diff += 0x10000;
t->int_timer->adjust(attotime::from_hz(clock()/8) * diff, which);
t->int_timer->adjust(cycles_to_attotime(4 * diff), which);
LOGMASKED(LOG_TIMER, "Set interrupt timer for %d\n", which);
}
else