My bad- I did a search for the part # NSC INS8050, and the first hit I got was on Wikipedia, which said it was SC/MP. But then I found a datasheet for it, and it is a standard 8050. I assume the ROM can be dumped by using the EA input to run a program from an external ROM that writes a program to RAM that will then dump the internal ROM contents out one of the ports. But the game isn't working, so I might have to decap it and visually dump the ROM.