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video/upd7220.cpp: clear FIFO and DMA status on RESET command issued

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* fix pc9801rs spindiz2 boot
This commit is contained in:
angelosa 2024-09-29 16:35:04 +02:00
parent 4033f44830
commit cd6c332617
1 changed files with 5 additions and 0 deletions
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5
src/devices/video/upd7220.cpp
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@ -1180,6 +1180,11 @@ void upd7220_device::process_fifo()
m_ra[3] = 0x19;
m_ead = 0;
m_mask = 0;
// FIFO, Command Processor and internal counters are cleared by this
// - pc9801rs BIOS starts up a DMAW command that spindiz2 will dislike during its boot sequences
m_sr &= ~UPD7220_SR_DRAWING_IN_PROGRESS;
fifo_clear();
stop_dma();
break;
case 9: