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Uniracers trick

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The Uniracers trick is scene slang for writing to OAM during hblank while fblank is disabled.

According to the official Super Nintendo development manual, VRAM and OAM are supposed to be accessible during fblank or vblank only. [1]

References

  1. caution #2: page 2-24-1 of Book I of the official Super Nintendo development manual
  2. https://forums.nesdev.org/viewtopic.php?p=236631#p236631
  3. https://forums.nesdev.org/viewtopic.php?f=12&t=6758#p65562