NES 2.0 Mapper 289

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NES 2.0 Mapper 289 is used for at least three multicarts designated in UNIF as BMC-60311C.

Mode Register ($6000), write

Mask: $E001

7654 3210
---------
.... MLPP
     ||++- PRG Banking Mode
     ||     0: NROM-128: PRG A14-A16 from Outer Bank Register
     ||     1: NROM-256: PRG A15-A16 from Outer Bank Register, PRG A14=CPU A14
     ||     2: UNROM: PRG A14-A16 from Data Latch when CPU A14=0, and 111b when CPU A14=1
     ||     3: PRG A14-16=1 regardless of CPU A14
     |+--- Protect CHR-RAM
     |      0: CHR-RAM writable
     |      1: CHR-RAM write-protected
     +---- Select nametable mirroring type
            0: Vertical
            1: Horizontal

Outer Bank Register ($6000), write

Mask: $E001

7654 3210
---------
.QQQ QPPp
 ||| |||+- PRG A14 in NROM-128 PRG Banking Mode
 ||| |++-- PRG A16..15 in NROM-128/-256 Banking Modes
 +++-+---- PRG A20..A17

Data Latch ($8000-$FFFF), write

Mask: $8000

7654 3210
---------
.... .PPP
      +++- PRG A16..14 in UNROM PRG Banking Mode when CPU A14=0