Technically, these ROMs are a nightmare for emulation. They often use non-standard "mappers" (the hardware logic that tells the NES how to read the cartridge data). Because every pirate manufacturer had their own way of "tricking" the console into displaying a menu of 99,999 items, many of these ROMs require specific emulator settings or specialized "hacked" versions of emulators to run correctly today. The Legacy of the Multicart
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From a technical standpoint, these ROMs are fascinating examples of usage. Since the NES hardware was limited, developers used "Mappers" (memory management controllers) to bank-switch data, allowing the console to see more memory than it was originally designed to handle. File Format: Usually found as a .nes file. nes rom 99999 in 1