NES 2.0 Mapper 312

NES 2.0 Mapper 312 is used for Kaiser's bootleg version of Highway Star. Its UNIF board name is UNL-KS7013B.

Banks

• CPU $8000-$BFFF: Switchable 16 KiB PRG-ROM bank
• CPU $C000-$FFFF: Fixed 16 KiB PRG-ROM bank #7
• PPU $0000-$1FFF: Unbanked 8 KiB of CHR-RAM

Registers

PRG-ROM Select ($6000-$7FFF)

Mask: $E000

D~7654 3210
  ---------
  .... .PPP
        +++- Select 16 KiB PRG-ROM bank at CPU $8000-$BFFF

Nametable Mirroring Type Select ($8000-$FFFF)

Mask: $8000

D~7654 3210
  ---------
  .... ...M
          +- Select nametable mirroring type
              0: Vertical
              1: Horizontal

See also

• PCB photos
• Krzysiobal's reverse engineering from above photos