A (often abbreviated as "Full Set" or "Non-Merged Set") is a complete collection of every single game, BIOS, and device that MAME 0.251 supports. This is not just Pac-Man and Street Fighter II ; this includes obscure Japanese Mahjong games, prototype hardware, casino slot machines, and even calculators.
One of the most confusing aspects of the MAME 0.251 set for new users is the packaging format. Because many arcade games share common hardware (e.g., Street Fighter II and its various "Champion Edition" updates share a main board), the ROMs are often packaged differently: Mame 251 Full Rom Set
Setting up a complete arcade archive requires specific software and a bit of patience. Step 1: Download the Correct Emulator A (often abbreviated as "Full Set" or "Non-Merged
That said, MAME 251 remains the (the introduction of plugin-based interfaces and removal of the built-in GUI in some builds). For retro PC builders, arcade cabinet makers, and anyone running an Intel Core 2 Duo or older, MAME 251 is still the recommended choice. Because many arcade games share common hardware (e