MAME 0.78 Plus ROMset (more commonly referred to as the MAME 2003-Plus Reference Set
Because it is a "fixed" romset, you don't have to worry about your games breaking when you update your emulator software, unlike "Current" MAME versions. Managing Your Romset mame 078 plus romset
It uses the original MAME 0.78 set as its foundation, meaning over 95% of standard 0.78 ROMs are compatible as-is. MAME 0