INES Mapper 191

 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.