NES 2.0 Mapper 457

NES 2.0 Mapper 457 denotes the MMC3-based 810431C multicart PCB, used for the 92 年超高K 黄金卡 35-in-1 刺激大驚險旅風侠 multicart. It is basically an oversized version of INES Mapper 047 with a selectable outer PRG and CHR bank size. Alternatively, it can be thought of as a simplified version of INES Mapper 052 without independent PRG/CHR control.

Extra Register ($6000-$7FFF, write)

Mask: $E000

D~[.... SBBB]
        |+++- PRG/CHR A19..A17
        +---- 0: 128 KiB outer PRG and CHR bank size
              1: 256 KiB outer PRG and CHR bank size
Value on reset: $00

Notes

• WRAM must be enabled in $A001.7 before writing to the extra register.
• Nestopia Plus! has assigned mapper number 2786 for this circuit board.