INES Mapper 020

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Revision as of 10:46, 15 October 2012 by Tepples (Talk | contribs) (then it isn't really used for carts and is thus categorized as "bad" per the definition in Mapper)

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Mapper 20 is defined as reserved for the Famicom Disk System (FDS) in official iNES specs. Ie. the mapper number is mostly intended for being internally used by emulators (to indicate to themselves that they are emulating the FDS hardware).

The mapper number could be theoretically used for the FDS BIOS ROM-image, but this isn't done in practice. The FDS BIOS is typically assingned as NROM (if it is dumped in iNES format), or it's stored as raw BIOS dump (without iNES header and without mapper number).