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Programmable I/O Port

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The 8-bit Programmable I/O Port, commonly referred to as WRIO for short, is located at 4201h. It has open collector output.[2]

References

  1. Official Super Nintendo development manual on the programmable i/o port: Page 2-14-1 of Book I
  2. https://problemkaputt.de/fullsnes.htm#snescontrollersioportsmanualreading
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