MAME 2003 Reference Set MAME 0.078 ) is a widely popular archive of arcade game data specifically optimized for low-power devices like the Raspberry Pi and platforms like

When you look for a MAME 0.078 set, you will see two distinct types of files: and CHDs . 1. The ROM Files

This is where the "2003" era gets tricky and interesting.

: Sound recordings for older games that used analog audio circuitry rather than digital sound chips (e.g., Donkey Kong or Galaga ). Why Version 0.078 Matters Imported MAME romset not showing - Noobs

The beauty of the 0.078 set is its finality. It is a time capsule. It represents the moment when emulation shifted from "let's play Pac-Man " to "let's preserve the entire history of arcade hardware." For the 2D arcade era, from 1978 to 1998, there is no better companion.

Some later arcade machines used hard drives or CD-ROMs to store massive amounts of data (like FMV sequences or high-fidelity audio). These are stored as .chd files.