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DSP1 in an enhancement chip with part number 22943 that implements common 3D math operations.

The DSP1 has registers named DR and SR. DR is mapped on the A Bus.

The following commands are supported:

The microcode implementing them is in the DSP1's internal ROM.

The DSP1 hardware supports DMA, but the SNES does not have a way to kick it off. [2]


In Figure 3-1-1 of the manual, the connection between the DSP1 chip and the 62-pin cartridge slot incorrectly appears outside the game pak.[3]

See Also

External Links

  1. https://snescentral.com/article.php?id=1239
  2. paragraph 4.4 on page 3-4-2 of Book II of the official Super Nintendo development manual
  3. Page 3-1-2, lbid.
  4. https://problemkaputt.de/fullsnes.htm#snescartdspnst010st011biosfunctions
  5. https://snescentral.com/chips.php?chiptype=DSPx
  6. https://en.m.wikipedia.org/wiki/NEC_%C2%B5PD7720