A merged set combines the parent ROM and all its clones into a single ZIP file. For example, sf2.zip would contain the original Street Fighter II, plus all region variants. This makes for a cleaner, although sometimes larger, file list.

The .DAT file is like a blueprint. It contains the exact specifications (names, sizes, and hashes) of every file that MAME 0.72 expects. You can get this by using ClrMAMEPro to parse the MAME 0.72 emulator executable directly. ClrMAMEPro reads the emulator and creates a datafile based on its internal database. Alternatively, you can often find pre-made 0.72 .DAT files shared within the community.

To get your arcade library running, follow these standard steps:

Modern versions of MAME prioritize high-accuracy emulation, which requires significant computing power. MAME 0.72 utilizes older, speed-optimized code. This makes it the absolute best choice for: Older Raspberry Pi models (Pi 1, 2, Zero, and 3).

In the emulation scene, a "ROM Set" refers to a specific collection of game files that are compatible with a specific version of MAME. Because MAME updates constantly, the checksums and file structures of ROMs change frequently. A ROM that works on MAME 0.273 might not work on MAME 0.72.