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increase mcu sync, it affected choplift scroll

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This commit is contained in:
Michaël Banaan Ananas 2011-12-17 09:22:18 +00:00
parent 51d2fec01e
commit 8e3bb2c4c5
1 changed files with 7 additions and 3 deletions
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10
src/mame/drivers/system1.c
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@ -615,9 +615,11 @@ static INTERRUPT_GEN( mcu_irq_assert )
static TIMER_DEVICE_CALLBACK( mcu_t0_callback ) static TIMER_DEVICE_CALLBACK( mcu_t0_callback )
{ {
/* the T0 line is clocked by something; if it is not clocked fast /* The T0 line is clocked by something; if it is not clocked fast
enough, the MCU will fail; on shtngmst this happens after 3 enough, the MCU will fail; on shtngmst this happens after 3
VBLANKs without a tick */ VBLANKs without a tick.
choplift is even more picky about it, affecting scroll speed
*/
device_t *mcu = timer.machine().device("mcu"); device_t *mcu = timer.machine().device("mcu");
device_set_input_line(mcu, MCS51_T0_LINE, ASSERT_LINE); device_set_input_line(mcu, MCS51_T0_LINE, ASSERT_LINE);
@ -2222,7 +2224,9 @@ static MACHINE_CONFIG_FRAGMENT( mcu )
MCFG_CPU_IO_MAP(mcu_io_map) MCFG_CPU_IO_MAP(mcu_io_map)
MCFG_CPU_VBLANK_INT("screen", mcu_irq_assert) MCFG_CPU_VBLANK_INT("screen", mcu_irq_assert)
MCFG_TIMER_ADD_PERIODIC("mcu_t0", mcu_t0_callback, attotime::from_msec(20)) /* ??? actual clock unknown */ MCFG_QUANTUM_TIME(attotime::from_hz(6000))
MCFG_TIMER_ADD_PERIODIC("mcu_t0", mcu_t0_callback, attotime::from_usec(2500)) /* ??? actual clock unknown */
MACHINE_CONFIG_END MACHINE_CONFIG_END