If you don't want to risk legal issues, consider these options:
The Neo Geo console cannot boot games without its system BIOS. Every ROM pack must include a file named neogeo.zip . This archive contains the original machine code that initializes the hardware, handles region settings (Japan, US, Europe), and toggles between Arcade (MVS) and Home Console (AES) modes. roms neo geo pack
Unlike standard home consoles of the 1990s, the Neo Geo architecture is unique. It relies on a specific ecosystem of BIOS files, specialized ROM structures, and heavy graphical assets. The Essential Role of the Neo Geo BIOS If you don't want to risk legal issues,
Every single game zip file contains all the files necessary to run that game, including any clone versions or regional variants. handles region settings (Japan