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