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maincpu irq notes

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This commit is contained in:
Michaël Banaan Ananas 2013-11-03 19:23:00 +00:00
parent b6be00ee2d
commit 6086201c51
1 changed files with 6 additions and 8 deletions
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14
src/mame/drivers/mazerbla.c
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@ -744,11 +744,9 @@ WRITE8_MEMBER(mazerbla_state::cfb_zpu_int_req_set_w)
READ8_MEMBER(mazerbla_state::cfb_zpu_int_req_clr)
{
m_zpu_int_vector |= 2;
/* clear the INT line when there are no more interrupt requests */
if (m_zpu_int_vector == 0xff)
m_maincpu->set_input_line(0, CLEAR_LINE);
// this clears all interrupts
m_zpu_int_vector = 0xff;
m_maincpu->set_input_line(0, CLEAR_LINE);
return 0;
}
@ -1364,9 +1362,9 @@ IRQ_CALLBACK_MEMBER(mazerbla_state::irq_callback)
/* D2 is set to GND when INT comes from ZPU board - from 6850 on schematics (RS232 controller) */
/* resulting vectors:
1111 11000 (0xf8)
1111 11010 (0xfa)
1111 11100 (0xfc)
1111 11000 (0xf8) - results in same as 0xfc
1111 11010 (0xfa) - does nothing
1111 11100 (0xfc) - calls several routines
note:
1111 11110 (0xfe) - cannot happen and is not handled by game */