| Most icons next to mapper numbers refer to publishers.
Nintendo-made boards with numerous publishers get the Nintendo icon; Nintendo-made boards dominated by one publisher get that publisher's icon.
Other icons refer to status:
 This mapper is "bad": it was used for something other than an actual cartridge. Some are mapper hacks designed for early disk-based copiers. Others are duplicate mappers that were assigned by mistake. "Pirate MMC3" mappers. Many are used for unauthorized demakes of 16-bit fighting games. Mappers used primarily by illegally copied games, usually multicarts, sometimes single-game mapper hacks. Mappers developed by members of the NES homebrew scene for cart releases Mappers for which we have some information but no identified manufacturer. Mappers that are not yet documented on this wiki. Do not assume undocumented mappers are currently unassigned; consult the Nestopia and Nintendulator source code.
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