The Neo-Geo had different BIOS versions for arcade (MVS) vs home (AES). MVS offers "Free Play" mode (dip switches) and unlimited credits. AES offers home menus and blood color options (red vs white).
The coolest thing about the Neo Geo BIOS is that it handles both the arcade experience and the home console experience. Through the settings in an emulator like FBNeo, you can toggle between two distinct modes: fbneo neogeo.zip