In the context of retro gaming, a (often called a "ROMset") is a collection of game files dumped from original cartridges or arcade boards. For the Neo Geo, these files allow modern software (emulators) to mimic the original hardware.
The home console version. These ROMs are often identical to MVS, but the emulator uses different "BIOS" settings to toggle home features like difficulty menus and limited credits. roms neo geo pack