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Horizontal Pseudo 512 Mode

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Pseudo Hi-Res Mode is a transparency technique that displays the Main Screen and Sub Screen at the same time without digital color math blending any pixels. It is enabled by setting bit 3 of SETINI (2133h). Columns of dots with an odd horizontal position are drawn by sampling a subscreen pixel, and columns of dots with an even horizontal position are drawn by sampling a main screen pixel. [3] A CRT televsion blends the adjacent dots together, creating the transparency effect.

Psuedo hi-res mode is not effective in Mode 5 or Mode 6.

As of 2022, there are no tools for working with psuedo hi-res mode. [2]


  • the HUD in Jurassic Park
  • the trees in Kirby's Dreamland 3

See Also


  1. https://nesdoug.com/2022/05/30/other-modes
  2. https://forums.nesdev.org/viewtopic.php?p=279353#p279353
  3. https://board.zsnes.com/phpBB3/viewtopic.php?p=47257
  4. Chapter 9. page 2-9-1 of Book I of the official Super Nintendo development manual