NES 2.0 Mapper 320

NES 2.0 Mapper 320 is used for the Super HiK 6-in-1 A-030 multicart. Basically UxROM with an address-latch-based outer bank register, its UNIF board name is BMC-830425C-4391T. Mirroring is hard-wired.

Banks

• CPU $8000-$BFFF: 16 KiB switchable inner and outer PRG-ROM bank
• CPU $C000-$FFFF: 16 KiB fixed inner and switchable outer PRG-ROM bank
• PPU $0000-$1FFF: 8 KiB unbanked CHR-RAM

Outer Bank Register

Mask: $FFE0

A~FEDC BA98 7654 3210
  -------------------
  1111 0000 111M BBBB
               | ++++- Select 128 KiB Outer Bank at CPU $8000-$FFFF
               +------ Select Outer Bank Size
                        0: 256 KiB (UOROM), fixed inner bank #15 at CPU $C000-$FFFF
                        1: 128 KiB (UNROM), fixed inner bank #7 at CPU $C000-$FFFF

Inner Bank Register

Mask: $8000

D~7654 3210
  ---------
  .... pPPP
       |+++- Select 16 KiB Inner PRG-ROM bank at CPU $8000-$BFFF
       +---- Select 128 KiB Inner PRG-ROM bank at CPU $8000-$BFFF if Outer Bank bit 4=0