INES Mapper 089
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This is part of a family of Sunsoft mappers used largely by Japanese games: (iNES Mapper 089, iNES Mapper 093, iNES Mapper 184)
This mapper is used by Tenka no Goikenban: Mito Koumon (J). This game uses the Sunsoft-2 chip, but it works differently than Mapper 093 (the board must be wired differently?)
Here is the documentation in disch's original style:
Registers: -------------------------- $8000-FFFF: [CPPP MCCC] C = Select 8k CHR @ $0000 P = Select 16k PRG @ $8000 M = Mirroring: 0 = 1ScA 1 = 1ScB PRG Setup: -------------------------- $8000 $A000 $C000 $E000 +---------------+---------------+ | $8000 | { -1} | +---------------+---------------+
Notes: --------------------------- I do not know whether or not this mapper suffers from bus conflicts. Use caution!