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atari/antic.cpp: VBL status is always held no matter enable irq reg, fixes a800 anteater hangs

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angelosa 2022-09-28 02:03:32 +02:00
parent 8bc84c08ea
commit dedf0964b6
1 changed files with 6 additions and 2 deletions
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8
src/mame/atari/antic.cpp
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@ -2362,12 +2362,16 @@ void antic_device::generic_interrupt(int button_count)
m_render2 = 0;
m_render3 = 0;
/* if the CPU want's to be interrupted at vertical blank... */
// At scanline 248 vblank status is always held without caring about the mask reg
// (cfr. anteater PC=a10a), while DLI always goes low.
m_r.nmist |= VBL_NMI;
m_r.nmist &= ~DLI_NMI;
/* if the CPU wants to be interrupted at vertical blank... */
if( m_w.nmien & VBL_NMI )
{
LOG(" cause VBL NMI\n");
/* set the VBL NMI status bit */
m_r.nmist |= VBL_NMI;
m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);
}
}