NES 2.0 Mapper 281 denotes a number of compatible circuit boards from J.Y. Company:
and is used for the following multicarts:
It uses the J.Y. Company ASIC.
Mask: $F003
7654 3210
---- ----
.... ..BB
++- PRG/CHR A18/A19 (256 KiB outer PRG/CHR-ROM bank)
PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 256 KiB banks are masked off.
For a description of all other registers, see J.Y. Company ASIC.
Categories: Multicart mappers, Mappers with cycle IRQs, Mappers with scanline IRQs, Mappers using J.Y. Company ASIC, Mappers with ROM nametables