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namcos23: Fix the irq storm that killed Downhill Bikers [O. Galibert]

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This commit is contained in:
Olivier Galibert 2014-03-31 18:43:26 +00:00
parent ad4c3741b0
commit 4369aec307
1 changed files with 9 additions and 2 deletions
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11
src/mame/drivers/namcos23.c
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@ -76,6 +76,13 @@
raise: c0.Count = 10c8e0
c0.Compare = 10d880
Downhill bikers irq ack on level 3:
check ad000000 & 0400
if not, a4c3ff04 = 0
check ad000000 & 0800
if not, read a682000a, wait until it stops changing (?)
return
****************************************************************************
@ -2557,7 +2564,7 @@ READ16_MEMBER(namcos23_state::c361_r)
// how does it work exactly? it's not understood in namcos22 either (also has a c361)
case 5:
update_main_interrupts(m_main_irqcause & ~MAIN_C361_IRQ);
return m_screen->vpos()*2 | (m_screen->vblank() ? 1 : 0);
return (m_screen->vpos()*2) | (m_screen->vblank() ? 1 : 0);
case 6:
update_main_interrupts(m_main_irqcause & ~MAIN_C361_IRQ);
return m_screen->vblank() ? 1 : 0;
@ -2613,7 +2620,7 @@ READ16_MEMBER(namcos23_state::ctl_r)
{
// 0100 set freezes gorgon (polygon fifo flag)
case 1:
return 0x0000 | ioport("DSW")->read();
return 0x0000 | ioport("DSW")->read() | ((m_main_irqcause & MAIN_C361_IRQ) ? 0x400 : 0);
case 2: case 3:
{
UINT16 res = m_ctl_inp_buffer[offset-2] & 0x800 ? 0xffff : 0x0000;