INES Mapper 074

iNES Mapper 074 is a MMC3 clone used in Eastern games. Like TQROM, mapper 74 has CHR ROM on some CHR pages and CHR RAM on others. This is necessary because the large number of characters in the Chinese writing system precludes having them all in one CHR ROM bank, so they're copied into CHR RAM as needed. But instead of CHR pages 128 through 255 being RAM like in TQROM, only pages 8 and 9 are RAM.