INES Mapper 000

iNES Mapper 000 is used to designate a board with up to 32 KiB PRG ROM, 8 KiB CHR ROM, and no mapper hardware. The most common board like this is NROM; others include RROM.

In addition, it is used for demos with up to 32 KB PRG ROM and 8 KB of CHR RAM which would otherwise not be supported on a standard NROM board. In theory, BNROM (iNES Mapper 034) might be a more appropriate choice for these demos.

An extension past 32 KiB was mooted on the BBS in May 2012, allowing $4800-$7FFF to be decoded to allow more linear address space for use with cc65.[1]

 Here are Disch's original notes:
 
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 =  Mapper 000          =
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 aka
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 NROM
 "no mapper"
 
 
 Example Games:
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 Ice Climber (J) (RROM)
 Excitebike
 Balloon Fight
 Super Mario Bros.
 
 
 
 Notes:
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 No swapping of any kind.  All slots fixed, mirroring is hardwired, etc.