A ROMset means every ROM zip file contains all the files needed to run that specific game — including BIOS and device ROMs. You don’t need separate BIOS zips (e.g., neogeo.zip , pgm.zip ) or parent ROMs.
Notes:
In arcade emulation, games often share files. A "Full Non-Merged" set removes these dependencies so every ZIP file is "standalone". mame 2003-plus reference: full non-merged romsets
Widely considered the "Goldilocks" emulator for arcade gaming, it balances performance, accuracy, and input latency. However, getting the correct games to run is often the biggest hurdle for new users. A ROMset means every ROM zip file contains