INES Mapper 191

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iNES Mapper 191 designates a board containing an MMC3 clone. It operates identically to iNES Mapper 119 with two differences:

  • CHR RAM is 2 KiB, instead of 8 KiB like on 119. (This can be overridden with NES 2.0.)
  • Bit 7 of the CHR bank number (A17) switches between CHR ROM and CHR RAM, instead of bit 6 (A16) like on 119.
 Here are Disch's original notes:  
 =  Mapper 191          =
 Pirate MMC3 variant
 Example Game:
 Sugoro Quest - Dice no Senshitachi (As)
 This mapper is a modified MMC3 (or is based on MMC3?).
 In addition to any CHR-ROM present, there is also an additional 2k of CHR-RAM which is selectable.  Bit 7 of
 each CHR reg selects RAM or ROM (1=RAM, 0=ROM)
 Apart from that, this mapper behaves exactly like your typical MMC3.  See mapper 004 for details.