Each version of an arcade emulator must be used with ROMs that have the same exact version number. The MAME 2003 Xtreme core accepts MAME 0.78 ROMsets. ROMset compatibility with MAME 2003 Xtreme MAME as it was in 2003, with a 2K23+ touch up! Suitable for lower-spec devices that would struggle to run current versions of MAME (later versions of MAME are increasingly accurate, thus can perform worse).
