NES 2.0 Mapper 456
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NES 2.0 Mapper 456 denotes the MMC3-based Realtec K6C3001A multicart PCB, used for the (ST-401) Super 4-in-1 multicart. It is basically an oversized version of INES Mapper 047 with the outer bank register moved from $6000 to $4100.
Extra Register ($4100, write)
Mask: $E100
D~[.... ..BB]
++- PRG/CHR A18..A17
Value on reset: $00
