NES 2.0 Mapper 342
NES 2.0 Mapper 342 is used for the homebrew COOLGIRL multicart. In addition to native registers, it can simulate about 25 commercial-era mappers on a hardware level. Like the COOLBOY mapper that inspired it, CHR data is fetched from 256 KiB of CHR-RAM. Its UNIF board name is just COOLGIRL.