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Jaguar: makes more sense that the PIT timers follows the m68k clock, fixes Raiden BGM tempo

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This commit is contained in:
Angelo Salese 2013-03-20 19:36:21 +00:00
parent 9e90158d7d
commit 1d4e5d3ba5
1 changed files with 3 additions and 8 deletions
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11
src/mame/video/jaguar.c
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@ -151,11 +151,6 @@
#define LOG_UNHANDLED_BLITS 0
// FIXME: this should be 1, but then MAME performance will be s*** with this
// (i.e. it drops the performance from 400% to 6% on an i5 machine).
// But the PIT irq is definitely needed by some games (for example Pitfall refuses
// to enter into gameplay without this enabled).
const int PIT_MULT_DBG_HACK = 64;
// interrupts to main CPU:
@ -615,9 +610,9 @@ WRITE16_MEMBER( jaguar_state::tom_regs_w )
break;
case PIT0:
case PIT1:
if (m_gpu_regs[PIT0] && m_gpu_regs[PIT0] != 0xffff) //FIXME: avoid too much small timers for now
if (m_gpu_regs[PIT0])
{
sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK);
sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK/2);
timer_set(sample_period, TID_PIT);
}
break;
@ -730,7 +725,7 @@ void jaguar_state::device_timer(emu_timer &timer, device_timer_id id, int param,
}
if (m_gpu_regs[PIT0] != 0)
{
attotime sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK);
attotime sample_period = attotime::from_ticks((1+m_gpu_regs[PIT0]) * (1+m_gpu_regs[PIT1]), JAGUAR_CLOCK/2);
timer_set(sample_period, TID_PIT);
}
break;