For what it’s worth…..not sure which ROM versions they are so your mileage may vary…. :D ROM location Address range Signature Midway Signature Namco Galaxian 7U 000-7FF E8E3 7A5F 7V 800-FFF 59F7 B6F3 7W 1000-17FF A069 18ED 7Y 1800-1FFF 22E6 917F 7Z 2000-27FF 7D9A 1EA2 André Huijts andre.huijts at upcmail.nl