Programmed input–output: Difference between revisions

Revision as of 16:06, 21 October 2013

Revision as of 15:13, 26 December 2013

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'''Programmed input/output''' ('''PIO''') is a method of transferring data between the [[Central processing unit|CPU]] and a peripheral, such as a network adapter or an [[AT Attachment|ATA]] storage device.

In general, programmed I/O happens when software running on the CPU uses instructions that access I/O address space to perform data transfers to or from an I/O device.