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video/upd7220.cpp: ignore parameters beyond first one for pitch command

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* fix pc9801:burai intro MAME crash
This commit is contained in:
angelosa 2024-10-18 21:54:08 +02:00
parent 8b46595df8
commit 16a5e4eb9e
1 changed files with 11 additions and 1 deletions
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12
src/devices/video/upd7220.cpp
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@ -1376,10 +1376,20 @@ void upd7220_device::process_fifo()
break;
case COMMAND_PITCH: /* pitch specification */
if (flag == FIFO_PARAMETER)
// pc9801:burai writes a spurious extra value during intro, effectively ignored
// (only first value matters)
if (flag == FIFO_PARAMETER && m_param_ptr == 2)
{
m_pitch = (m_pitch & 0x100) | data;
if (m_pitch < 2)
{
// TODO: a pitch of zero will lead to a MAME crash in draw_graphics_line
// Coerce a fail-safe minimum, what should really happen is to be verified ...
popmessage("%s pitch == 0!", this->tag());
m_pitch = 2;
}
LOG("uPD7220 PITCH: %u\n", m_pitch);
}
break;