iNES Mapper 200 denotes the circuit boards of simple address-latch-based NROM-128 multicarts, i.e. CPU $8000-$BFFF is always a mirror of CPU $C000-$FFFF.
The mapper number is used for two variants that differ in the bit that selects nametable mirroring.
PCB that use this mapper :
A~[1... .... .... bBBB] |+++- PRG A16..A14, CHR A15..A13 +---- PRG A17, CHR A16, Mirroring: 0: Vertical 1: Horizontal
A~[1... .... .... .bBB] |++- PRG A15..A14, CHR A14..A13 +--- PRG A16, CHR A15, Mirroring: 0: Vertical 1: Horizontal
Categories: INES Mappers, Multicart mappers