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FastROM is 3.58 MHz. It is about 33% faster than SlowROM. FastROM is a property of the ROM chip itself and not the board it is soldered onto.[2]

FastROM speeds only apply to the upper halves of banks $80-bf and all of banks $c0-ff.[1]

See Also

External Links


  1. Near, https://forums.nesdev.org/viewtopic.php?t=9585
  2. Bregalad, lbid.