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Old BIOS packs often used the merged or non-merged approach, wasting space. A pack follows the split-set convention, allowing all games to share a single neogeo.zip or qsound.zip .

MAME is an emulator that allows you to play classic arcade games on your computer. It's an open-source project that relies on a vast community of developers and contributors. One of the critical components of MAME is the BIOS (Basic Input/Output System) pack, which contains essential files needed to run various arcade games. These files help in initializing the hardware and provide a layer of compatibility for the games to run smoothly.

A "BIOS pack" is simply a collection of these critical system files bundled together. A MAME 0.78 BIOS pack typically means the files have been re-dumped, CRC-verified against the official MAME 0.78 dat file, and de-duplicated to save space.