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spg2xx: Only flag sprite DMA done IRQ if it is enabled. Gets mattelcs to boot. nw

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This commit is contained in:
MooglyGuy 2019-01-14 23:36:20 +01:00
parent 28bc5506be
commit c929d074dc
1 changed files with 8 additions and 1 deletions
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9
src/devices/machine/spg2xx.cpp
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@ -688,7 +688,14 @@ void spg2xx_device::do_sprite_dma(uint32_t len)
}
m_video_regs[0x72] = 0;
VIDEO_IRQ_STATUS |= 4;
if (VIDEO_IRQ_ENABLE & 4)
{
const uint16_t old = VIDEO_IRQ_STATUS;
VIDEO_IRQ_STATUS |= 4;
const uint16_t changed = old ^ (VIDEO_IRQ_ENABLE & VIDEO_IRQ_STATUS);
if (changed)
check_video_irq();
}
}
READ16_MEMBER(spg2xx_device::video_r)