NES 2.0 mapper 340 is used for a 35-in-1 multicart. Its UNIF board name is BMC-K-3036.
Mask: $8000
A~FEDC BA98 7654 3210 D~7654 3210
------------------- ---- ----
.... .... ..MO OIII .... .III
|| |||| +++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF in UNROM mode
|| |+++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF/$C000-$FFFF in NROM-128 mode
|+-+|-|- Select 128 KiB outer PRG-ROM bank at CPU $8000-$FFFF
+---|-|- Select $C000-$FFFF behavior
| | | 0: UNROM (Inner Bank forced to #7 at CPU $C000-$FFFF)
| | | 1: NROM-128 (CPU $C000-$FFFF mirror of $8000-$BFFF)
+---+-+- Select nametable mirroring type
0x25: Horizontal
all others: Vertical
Categories: Mappers with CHR RAM, Multicart mappers