NES 2.0 Mapper 438

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NES 2.0 Mapper 438 denotes the K-3071 multicart circuit board for NROM-128/NROM-256 games with selectable mirroring. 

A~[1... .... ..PP PPpM] D~[..CC CCCN]
               || ||||       || |||+- Mirroring (1=Vertical)
               || ||||       ++-+++-- CHR A17..A13
               || |||+--------------- PRG mode (0=NROM-128, 1=NROM-256)
               ++-+++---------------- PRG A18..A14
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