INES Mapper 042
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iNES Mapper 042 was used by hacked FDS games converted to cartridge form, specifically the Ai Senshi Nicol pirate cartridge.
Memory map:
PRG:
- 6000-7FFF: Switchable 8k PRG ROM bank
- 8000-FFFF: Fixed to last 32k
CHR:
- 0000-1FFF: Switchable 8k CHR ROM bank
Registers:
- 8000-8001: Select 8k CHR bank
- E000: Select 8k PRG ROM bank at 6000-7FFF
- E001: Select mirroring: (08 = vertical, 00 = horizontal)