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.
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
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
Categories: Multicart mappers