NES 2.0 Mapper 422

NES 2.0 Mapper 422 denotes the BS-300, BS-400 and BS-4040 multicart PCBs. The UNIF board names are BMC-BS-400R and BMC-BS-4040R. It is identical to NES 2.0 Mapper 534 except that the reload value for the scanline counter is not inverted. An alternative description would be that it is identical to INES Mapper 126 except that the bit order of the CHR A18/A19 bits is reversed.