You should opt for a Non-Merged set if you are planning to specific games. For example, if you are using a tool like the LaunchBox MAME Import Wizard to create a small, curated library of favorites, non-merged sets allow you to delete the thousands of unwanted files without accidentally deleting a "parent" file that a favorite game needs to run.

For many casual players and curators, the is the holy grail of convenience. Here is everything you need to know about why you might want one and how they work. What is a Non-Merged ROM Set?

Many arcade systems (like NeoGeo, Capcom Play System, or Sega Model 2) require a separate BIOS file to boot.

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