INES Mapper 220
iNES Mapper 220 is used by FCEUX as a debugging mapper assignment. Although it normally shouldn’t be assigned to ROMs for regular usage, several iNES ROM images online are set to Mapper 220, including Gyruss (FDS conversion) and Boogerman II: The Final Adventure. Emulators should perform a hash check on the ROM image and compare the database to determine the correct mapper being used.