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igs/igs027a.cpp: Corrected timer interval calculation. (#12759)
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Fixes slowdown in jking02.
This commit is contained in:
XingXing 2024-09-13 22:06:01 +08:00 committed by GitHub
parent 126e2e3f13
commit 1797664a33
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1 changed files with 10 additions and 1 deletions
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11
src/mame/igs/igs027a.cpp
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@ -87,7 +87,16 @@ template <unsigned N>
void igs027a_cpu_device::timer_rate_w(u8 data)
{
// TODO: determine how timer intervals are derived from clocks
m_irq_timers[N]->adjust(attotime::from_hz(data / 2), 0, attotime::from_hz(data / 2));
if (data)
{
constexpr u32 TIMER_DIVISOR = 4263;
auto period = attotime::from_ticks(TIMER_DIVISOR * (data + 1), clock());
m_irq_timers[N]->adjust(period, 0, period);
}
else
{
m_irq_timers[N]->adjust(attotime::never, 0, attotime::never);
}
}
u8 igs027a_cpu_device::irq_pending_r()