INES Mapper 191

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:  
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 =  Mapper 191          =
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 aka:
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 Pirate MMC3 variant
 
 
 Example Game:
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 Sugoro Quest - Dice no Senshitachi (As)
 
 
 Notes:
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 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.

See also:

• Waixing's other MMC3-based mappers with both CHR RAM and CHR ROM- 074, 192, 194, 195
• Waixing's VRC4-based mappers with both CHR RAM and CHR ROM- 252, 253