Craig's MAME emulator currently only emulates 8080-based processors, same as this port. SIEmu's author plans to have as full a port of the SDL implementation of MAME as possible on a GP32. But I just added the part about Craig's emu to spark discussion...it's not like this is a competition!
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SIEmu MAME 5
Craig MAME 4
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Just kidding!