NES 2.0 Mapper 437

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NES 2.0 Mapper 437 denotes the NTDEC TH2348 multicart circuit board for eight UNROM games with an additional outer bank register.

Outer Bank register ($5000-$5FFF, write)

A~[0101 .... .... MOOO]
                  |+++- PRG A19..A17
                  +---- Nametable mirroring
                        0: CIRAM A10=PPU A10 (vertical)
                        1: CIRAM A10=PPU A11 (horizontal)
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