well, i want to make one for Shin Megami Tensei and Gundam Wing.
both of these games are 2 MB.
now, in the case of nightmare busters, you just have to swap pins 24 and 31.
since both of these fit on 2 Eproms, would i be able to just find a donor board that has 2 rom chips, and simply swap pins 24 and 31, as i did with Nightmare Busters, or do i need to do the whole mess of wires thing?