NES 2.0 Mapper 287

NES 2.0 Mapper 287 is used for at least two 4-in-1 multicarts (411120-C, 811120-C). Its UNIF board name is BMC-411120-C. It has a DIP switch with a 0/1 setting.

Address latch ($6800-$6FFF, write)

Mask: probably $F800

 7654 3210
 ---------
 ..II MmOO
   || ||++- Select 128 KiB Outer PRG-ROM/CHR-ROM bank regardless of banking mode
   || |+--- If DIP Switch ==1: Same function as Bit 3
   || ++--- Select PRG Banking Mode
   ||        0: MMC3 Inner Bank, 128 KiB Outer Bank
   ||        1: 32 KiB Inner Bank (Bits 0-1) and 128 KiB Outer Bank
   ++------ Select 32 KiB inner PRG-ROM bank at CPU $8000-$FFFF if Bit 3==0

MMC3-compatible registers ($8000-$FFFF, write)

Mask: $E001

$8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3.