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SlowROM

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SlowROM is 2.68 Mhz and its ROM access speed is 200ns. It is not as fast as FastROM. SlowROM is a property of the ROM chip itself and not the board it is soldered onto.[2] DMA always happens at SlowROM speed. When the 5A22 is operating at slowROM speed, there are 8 master clock cycles per CPU machine cycle.

master clock divider speeds.png

See Also

References

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