The BIOS is the heart of the system. Most full repacks already include this. If not, search for "Neo Geo BIOS" and place it there.
The actual game files (like mslug.zip for Metal Slug). neoragex 52 download hot
Websites like InsertMoreCoins.es provide comprehensive guides on how to find the software safely. While they don't host the ROMs, they guide you toward legitimate technical documentation and safe download mirrors. The BIOS is the heart of the system