NES 2.0 Mapper 344

NES 2.0 Mapper 344 is used for the Kuai Da Jin Ka Zhong Ji Tiao Zhan 3-in-1 (3-in-1,6-in-1,Unl) multicart. Its UNIF board name is BMC-GN-26.

Outer Bank and Mode Register ($6000-$7FFF, write)

Mask: $E000

A~FEDC BA98 7654 3210
  -------------------
  .... .... ..oo DSOO
              || ||++- PRG/CHR A17..A18 when S=0
              || |+--- Select PRG-ROM mode
              || |      0: Normal MMC3 mode
              || |      1: Pseudo-NROM: MMC3 bank register 6 bits 1-3
              || |         provides PRG A14..A16 for CPU $8000-$FFFF
              || +---- PRG A14 mode when S=1
              ||        0: PRG A14=CPU A14 (NROM-256)
              ||        1: PRG A14=MMC3 bank register 6 bit 1
              ++------ PRG/CHR A17..A18 when S=1

As it uses the MMC3 clones's WRAM interface, writing to the Outer Bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register.

MMC3-compatible registers

Mask: $E001

See MMC3.

Notes

• The inner PRG-ROM bank is restricted to 128 KiB, the CHR-ROM bank unrestricted.