Mame 2003-plus Reference: Full ((free)) Non-merged Romsets -

In MAME, games are categorized as Parents or Clones.

In arcade emulation, games often share code (e.g., a "parent" game and its "clones"). A set differs from other formats by how it handles these dependencies: mame 2003-plus reference: full non-merged romsets

As the name suggests, non-merged sets keep each game separate. This approach ensures that each game has its unique data set without overlap, reducing confusion and potential errors. In MAME, games are categorized as Parents or Clones