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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] WRIO is the out-port.

There is also the RDIO register at 4213h. RDIO is the in-port.

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. page 2-28-1 of Book I on WRIO
  4. page 2-28-7 of Book I on RDIO
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