INES Mapper 112

iNES Mapper 112 is quite similar to iNES Mapper 206, which resembles an simplified MMC3; however, the registers appears to be scrambled a bit.

Example Games:

Huang Di
San Guo Zhi - Qun Xiong Zheng Ba

Registers

Mask: $E001

Bank select ($8000)

7  bit  0
---- ----
xxxx xRRR
      |||
      +++- Specify which bank register to update on next write to Bank Data register
           0: Select 8 KB PRG ROM bank at $8000-$9FFF
           1: Select 8 KB PRG ROM bank at $A000-$BFFF
           2: Select 2 KB CHR bank at PPU $0000-$07FF
           3: Select 2 KB CHR bank at PPU $0800-$0FFF
           4: Select 1 KB CHR bank at PPU $1000-$13FF
           5: Select 1 KB CHR bank at PPU $1400-$17FF
           6: Select 1 KB CHR bank at PPU $1800-$1BFF
           7: Select 1 KB CHR bank at PPU $1C00-$1FFF

Bank data ($A000)

7  bit  0
---- ----
DDDD DDDD
|||| ||||
++++-++++- New bank value, based on last value written to bank select register (mentioned above)

Nametable arrangement ($E000)

7  bit  0
---- ----
xxxx xxxN
        |
        +- Nametable arrangement (0: horizontal (A10); 1: vertical (A11))

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