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)
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