iNES Mapper 191 designates a board containing an MMC3 clone. It operates identically to iNES Mapper 119 with two differences:
Here are Disch's original notes: ======================== = Mapper 191 = ======================== aka: -------------------------- Pirate MMC3 variant Example Game: -------------------------- Sugoro Quest - Dice no Senshitachi (As) Notes: -------------------------- 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:
Categories: Mappers with scanline IRQs, INES Mappers, MMC3 with CHR ROM and CHR RAM