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Channel I/O
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<p>In <a href="/facts/Computing/Kghtm9fX">computing</a>, channel I/O is a high-performance <a href="/facts/Input/output/WQTE8Jas">input/output</a> (I/O) architecture that is implemented in various forms on a number of computer architectures, especially on <a href="/facts/Mainframe_computer/nrBR6rWa">mainframe computers</a>. In the past, channels were generally implemented with custom devices, variously named channel, I/O processor, I/O controller, I/O synchronizer, or <i><a href="/facts/DMA_controller/DWuVgclV">DMA controller</a></i>. </p>