Without this specific BIOS file, your favorite SNK classics—from Metal Slug to King of Fighters —simply will not boot. They will hang on a black screen or display a cryptic error message about missing ROMs.

If using Neo Geo games in RetroArch, it is often better to have the BIOS in the system folder. Are you using MAME or RetroArch ? What error message do you see?

When you open a correct neogeo.zip file, you won't see a neat installer. You will see a collection of .bin or .rom files. As of the latest MAME versions (0.250+), the essential NeoGeo BIOS files include: