NES 2.0 Mapper 340

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NES 2.0 mapper 340 is used for a 35-in-1 multicart. Its UNIF board name is BMC-K-3036.

Banks

  • CPU $8000-$BFFF: Switchable 16 KiB inner PRG-ROM bank and switchable 128 KiB outer PRG-ROM bank
  • CPU $C000-$FFFF: Fixed 16 KiB inner PRG-ROM bank #7/Mirror of $8000-$BFFF and switchable 128 KiB outer PRG-ROM bank
  • PPU $0000-$1FFF: Unbanked 8 KiB CHR-RAM

Address/Data Latch ($8000-$FFFF)

Mask: $8000

A~FEDC BA98 7654 3210   D~7654 3210
  -------------------     ---- ----
  .... .... ..MO Om.m     .... .III
              || || |           +++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF
              |+-+|-|- Select 128 KiB outer PRG-ROM bank at CPU $8000-$FFFF
              +---|-|- Select $C000-$FFFF behavior
              |   | |   0: UNROM (Inner Bank forced to #7 at CPU $C000-$FFFF)
              |   | |   1: NROM-128 (CPU $C000-$FFFF mirror of $8000-$BFFF)
              +---+-+- Select nametable mirroring type
                        0x25: Horizontal
                        all others: Vertical