FxROM

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The generic designation FxROM refers to cartridge boards made by Nintendo that use the Nintendo MMC4 mapper.

The following FxROM boards are known to exist:

Board PRG ROM PRG RAM CHR
FJROM 128, 256 KB 8 KB 16, 32, 64 KB ROM
FKROM 128, 256 KB 8 KB 128 KB ROM

Overview

  • PRG ROM size: up to 256 KB
  • PRG ROM bank size: 16 KB
  • PRG RAM: 8 KB plus optional battery
  • CHR capacity: up to 128 KB ROM
  • CHR bank size: 4 KB
  • Nametable mirroring: Controlled by mapper
  • Subject to bus conflicts: No

Hardware

These are the only Nintendo boards to use a specific chip dedicated to safe battery backup.

See also

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