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PIO

programmed I/O

Write a byte to the device (e.g. a terminal)

  1. Store the byte in the write register
  2. Set GoW in the control register
  3. Check the RdyW bit in status register until it is set

or

  1. Store the byte in the write register
  2. Set GoW and IEW bits in the control register
  3. Be notified when the write completes (by device interrupt)


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