NES 2.0 mapper 336 is used for multicarts containing several UNROM games. Its UNIF board name is BMC-K-3046.
Submapper 0:
Submapper 1 (M1K30 PCB):
Submapper 2:
Mask: $8000
D~7654 3210
---------
..OO OIII
|| |+++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF
++-+---- Select 128 KiB outer PRG-ROM bank at CPU $8000-$FFFF
| +---- Mirroring (Submapper 2), 1=H, 0=V
+------- Mirroring (Submappers 0/1), 1=H, 0=V
Submappers 0 and 2 have no bus conflicts. Submapper 1 does: D0-D2 are affected by normal AND-type bus conflicts, while D3 has a resistor in the signal path to ensure that the ROM bit always "wins", similar to INES Mapper 144. This behavior is necessary for proper function.
Categories: Mappers with CHR RAM, Multicart mappers