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Programmable I/O Port

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The 8-bit Programmable I/O Port allows the 5A22 to communicate with SNES peripherals.

There is the register commonly referred to as WRIO for short located at 4201h. It has open collector output.[2]

See Also

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
  3. https://archive.org/details/SNESDevManual/book1/page/n139
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