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video/jaguar.c: Fixed PIT functionality (fixes Tempest 2000 controls). (nw)

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This commit is contained in:
Ville Linde 2013-02-12 02:34:17 +00:00
parent 8eee0dd548
commit 72380cbc92
1 changed files with 7 additions and 4 deletions
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11
src/mame/video/jaguar.c
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@ -617,7 +617,7 @@ WRITE16_MEMBER( jaguar_state::tom_regs_w )
case PIT1:
if (m_gpu_regs[PIT0] && m_gpu_regs[PIT0] != 0xffff) //FIXME: avoid too much small timers for now
{
sample_period = attotime::from_nsec(((m_gpu->unscaled_clock()*PIT_MULT_DBG_HACK) / (1+m_gpu_regs[PIT0])) / (1+m_gpu_regs[PIT1]));
sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK);
timer_set(sample_period, TID_PIT);
}
break;
@ -723,11 +723,14 @@ void jaguar_state::device_timer(emu_timer &timer, device_timer_id id, int param,
break;
case TID_PIT:
m_cpu_irq_state |= 4;
update_cpu_irq();
if (m_gpu_regs[INT1] & 0x8)
{
m_cpu_irq_state |= 8;
update_cpu_irq();
}
if (m_gpu_regs[PIT0] != 0)
{
attotime sample_period = attotime::from_nsec(((m_gpu->unscaled_clock()*PIT_MULT_DBG_HACK) / (1+m_gpu_regs[PIT0])) / (1+m_gpu_regs[PIT1]));
attotime sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK);
timer_set(sample_period, TID_PIT);
}
break;