When searching for an all-in-one pack, you will encounter three main organizational styles. Choosing the right one depends on your storage space and how you plan to use them. MAME 0.260 ROMs (non-merged) : Various - Internet Archive

System software required for specific arcade hardware configurations (e.g., Neo Geo, Sega Naomi, or Capcom Play System).

If storage space is limited, we can discuss how to find instead of downloading a full terabyte of data.

In your MAME emulator, set the path to your ROMs folder, usually C:\Mame\roms .