NES 2.0 Mapper 314

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NES 2.0 Mapper 314 is used for the 32-in-1 Y2K and 64-in-1 Y2K multicarts. Its UNIF board name is BMC-64in1NoRepeat.

Miscellaneous register ($5000, write)

Mask: Unknown, probably $F003

D~7654 3210
  ---------
  ..M. .CC.
    |   ++- Bits 0-1 of 8 KiB CHR-ROM bank at PPU $0000-$1FFF
    +------ Select nametable mirroring type
             0: Vertical
             1: Horizontal

Power-on value: $00

PRG-ROM register ($5001, write)

Mask: Unknown, probably $F003

D~7654 3210
  ---------
  MpPP PPPP
  ||++-++++- Select 32 KiB PRG-ROM bank at CPU $8000-$FFFF
  |+-------- Select 16 KiB PRG-ROM bank at CPU $8000-$BFFF and
  |          CPU $C000-$FFFF if M==0
  +--------- Select PRG banking mode
              0: NROM-128
              1: NROM-256

Power-on value: $43

CHR-ROM mode ($5002, write)

Mask: Unknown, probably $F003

D~7654 3210
  ---------
  .... CCCC
       ++++- Bits 2-5 of 8 KiB CHR-ROM bank at PPU $0000-$1FFF

Power-on value: $00