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03718: shdancer: Freeze on stage 2-4 [Phil Bennett]

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Phil Bennett 2012-12-09 17:37:46 +00:00
parent 605cfb0534
commit 7c5fa01c74
1 changed files with 7 additions and 1 deletions
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8
src/mame/machine/segaic16.c
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@ -414,9 +414,15 @@ void sega_315_5195_mapper_device::map_as_rom(UINT32 offset, UINT32 length, offs_
m_banks[m_curregion].set(bank, info.start, romend, rgnoffset, memptr);
}
// install a write handler if provided
// either install a write handler if provided or unmap the region
//
// shdancer relies on this behaviour to prevent a write to ROM from
// falling through to the memory-mapping registers and crashing the
// game during stage 2-4 (see PC:$18a98). Protection maybe?
if (!whandler.isnull())
m_space->install_write_handler(info.start, info.end, 0, info.mirror, whandler);
else
m_space->unmap_write(info.start, info.end, 0, info.mirror);
}