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)