NES 2.0 Mapper 378

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NES 2.0 Mapper 378 denotes a circuit board with unknown ID, used for an 8-in-1 512 KiB multicart containing one AxROM and two UNROM games.

Outer Bank register ($8000-$FFFF, write)

Mask: $8000

A~FEDC BA98 7654 3210
  -------------------
  1... .... ..MS cbaa
              || |+++- PRG A15-A17
              || |+--- UNROM only: 0=Vertical, 1=Horizontal mirroring
              || +---- UNROM only: PRG A14 when CPU A14=0
              |+------ CIRAM A10 in AxROM mode
              +------- PRG A18, also:
                        0: AxROM mode: PRG A14=CPU A14
                        1: UNROM mode: PRG A14=c if CPU A14=0,
                                       PRG A14..16=7 if CPU A14=1