NES 2.0 Mapper 432

NES 2.0 Mapper 430 denotes the MMC3-based Realtec 8090 multicart circuit board, used for the 3-in-1 High Standerd [sic] (DP-33) multicart.

Outer Bank Register ($6000-$7FFF, write)

Mask: $E000

D~7654 3210
  ---------
  ...B .M.b
     |  | +-- PRG/CHR A17
     |  +---- 0: PRG/CHR A17=MMC3 PRG/CHR A17 (256 KiB inner PRG/CHR bank)
     |        1: PRG/CHR A17=b (128 KiB inner PRG/CHR bank)
     +------- PRG/CHR A18

As it uses the MMC3 clones's WRAM interface, writing to the outer bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register.

MMC3-compatible registers ($8000-$FFFF)

Mask: $E001

See MMC3.