Use the MAME interface to "Audit" your games. If a game is red, MAME will tell you exactly which BIOS file is missing.
Your MAME directory should look like this: all mame bios
There are several types of MAME BIOS files, each corresponding to a specific arcade machine or group of machines. Some of the most common types of MAME BIOS include: Use the MAME interface to "Audit" your games
| System | BIOS Filename (in MAME) | Notes | | :--- | :--- | :--- | | | neogeo.zip | The most important one. Required for every Neo Geo game (100+ titles). | | Nintendo NES/Famicom | nes.zip | Required for all NES games. | | Nintendo Game Boy | gameboy.zip | Original Game Boy. | | Nintendo Game Boy Color | gbcolor.zip | For GBC games. | | Sega Genesis/Megadrive | genesis.zip or megadriv.zip | Required for most Genesis games. | | Sega Master System | sms.zip | | | Sony PlayStation | psx.zip | Required for PS1 games. Requires separate .bin files for each region (USA, Japan, Europe). | | SNK Neo Geo CD | neocdz.zip | For Neo Geo CD games. | | Capcom Play System 1 (CPS-1) | cps1.zip | Usually included with games, but sometimes needed separately for system ROMs. | | Capcom Play System 2 (CPS-2) | cps2.zip | Contains the key/encryption data. | Some of the most common types of MAME