FastROM

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] When the 5A22 is operating at fastROM, there are 6 CPU cycles per master clock cycle.

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

The SAS cannot use FastROM.^[3]

See Also

• List of FastROM Games

External Links

• https://gbatemp.net/threads/romhacker-kandowontu-converts-more-than-80-snes-titles-into-fastrom-improving-their-performance.629133
• "High Speed Required?" checkbox on page 1-2-9 of Book I of the official Super Nintendo development manual

References

1. Near, https://forums.nesdev.org/viewtopic.php?t=9585
2. Bregalad, lbid.
3. caution 3.3.6.1 on page 1-3-4 of Book II of the official Super Nintendo development manual