If you already have MAME, generate your own index:

Every ZIP contains all the files needed to run that specific version of a game independently. This is easier for cherry-picking specific titles but wastes space through redundant files.

The main version of a game (usually the original Japanese or US release). Clone ROMs:

To run games on these platforms, you need the BIOS ZIP file (e.g., neogeo.zip ) sitting in your ROMs folder alongside the game ZIP files. Without the BIOS index, the specific games will not load.

Parent Directory 1942.zip 1943.zip 1944.zip afterburner.zip ...