I'm trying to test out my ROM hack in MAME before burning it, and I obviously don't know what I'm doing. I'm modifying the rom directly with a hex editor (no dis/reassembly) , but as soon as I change something, MAME says "The selected game is missing one or more required ROM or CHD images" when I try to load it. I haven't changed any header information, so I figured MAME would just load it like normal. Maybe a checksum issue?
