NES 2.0 mapper 350 is used for a Super 15-in-1 Game Card multicart. Its UNIF board name is BMC-891227.
Mask: $C000
D~7654 3210
---------
MPPB B...
|||+-+---- Select 128 KiB outer PRG-ROM bank
||+------- Chip select
||| 0: First 512 KiB
||| 1: Second 512 KiB (selectable only in UNROM mode)
|++------- Select PRG-ROM banking mode
| 0: NROM-128
| 1: NROM-256 (inner bank bit 0 replaced with CPU A14)
| 2: UNROM (inner bank fixed to #7 at CPU $C000-$FFFF)
| 3: same as 2
+--------- Select nametable mirroring type
0: Vertical
1: Horizontal
CHR-RAM is write-protected in the NROM modes.
Mask: $C000
D~7654 3210
---------
.... .BBB
+++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF/$C000-$FFFF
NES 2.0 Mapper 337 is a variant for smaller ROM sizes of this mapper.
Categories: Mappers with CHR RAM, Multicart mappers