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segaxbd.cpp: Too many watchdog resets; schematics may be wrong (nw)

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This commit is contained in:
AJR 2017-04-16 15:21:12 -04:00
parent 0c7771ee02
commit 8ad2708f35
2 changed files with 15 additions and 3 deletions
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2
src/devices/machine/mb3773.cpp
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@ -59,6 +59,8 @@ void mb3773_device::device_reset()
void mb3773_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
logerror("Reset caused by watchdog\n");
#if WATCHDOG_DEBUG
machine().debug_break();
#else

16
src/mame/drivers/segaxbd.cpp
View File

@ -17,6 +17,10 @@
due to testing an out-of-bounds value
* rascot is not working at all
The After Burner schematics seem to show that the MB3773 clock input
is controlled only by PC6 on the first CXD1095. However, most games,
including aburner2, fail to periodically clear the watchdog timer
this way to prevent unwanted resets.
Sega X-Board System Overview
Sega, 1987-1992
@ -501,7 +505,7 @@ WRITE8_MEMBER(segaxbd_state::pc_0_w)
{
m_pc_0 = data;
// Output port:
// Output ports according to After Burner schematics:
// D7: (Not connected)
// D6: (/WDC) - watchdog reset
// D5: Screen display (1= blanked, 0= displayed)
@ -822,9 +826,15 @@ void segaxbd_state::update_main_irqs()
m_maincpu->set_input_line(2, CLEAR_LINE);
if (m_vblank_irq_state)
{
irq |= 4;
m_watchdog->write_line_ck(0);
}
else
{
m_maincpu->set_input_line(4, CLEAR_LINE);
m_watchdog->write_line_ck(1);
}
if (m_gprider_hack && irq > 4)
irq = 4;
@ -1699,13 +1709,13 @@ static MACHINE_CONFIG_FRAGMENT( xboard )
MCFG_SEGA_315_5250_COMPARE_TIMER_ADD("cmptimer_subx")
MCFG_DEVICE_ADD("iochip_0", CXD1095, 0)
MCFG_DEVICE_ADD("iochip_0", CXD1095, 0) // IC160
MCFG_CXD1095_IN_PORTA_CB(IOPORT("IO0PORTA"))
MCFG_CXD1095_IN_PORTB_CB(IOPORT("IO0PORTB"))
MCFG_CXD1095_OUT_PORTC_CB(WRITE8(segaxbd_state, pc_0_w))
MCFG_CXD1095_OUT_PORTD_CB(WRITE8(segaxbd_state, pd_0_w))
MCFG_DEVICE_ADD("iochip_1", CXD1095, 0)
MCFG_DEVICE_ADD("iochip_1", CXD1095, 0) // IC159
MCFG_CXD1095_IN_PORTA_CB(IOPORT("IO1PORTA"))
MCFG_CXD1095_IN_PORTB_CB(IOPORT("IO1PORTB"))
MCFG_CXD1095_IN_PORTC_CB(IOPORT("IO1PORTC"))