Mame 2003-plus Reference: Hot! Full Non-merged Romsets

In the world of arcade emulation, the MAME 2003-Plus Reference: Full Non-Merged Romset is widely considered the "gold standard" for performance-oriented setups like the Raspberry Pi or mobile devices.  What is MAME 2003-Plus? 

Why use a full non-merged set?

• Simplicity: each game directory/file is self-contained; easier for manual copying, per-game mods, or per-game auditing.
• Compatibility: some frontends/emulators or tools expect standalone files and may fail with strict merged/parent setups.
• Preservation: ensures each named game includes the exact files the driver expects without relying on parent references.

CHDs: Large disk image files for certain 90s games (e.g., Killer Instinct). MAME 2003-Plus uses CHD v3. mame 2003-plus reference: full non-merged romsets