Execute Channel Program: Difference between revisions

Revision as of 05:19, 8 August 2020

Revision as of 07:47, 8 August 2020

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{{short description|Operating System Programlow level I/O API}}

{{refimprove|date=June 2012}}

In [[IBM mainframe]] [[operating system]]s, '''Execute Channel Program''' ('''EXCP''') is a [[Supervisor Call instruction|supervisor call]] for low-level device access, where the programmer is responsible for providing a ''[[Channel program#Channel Program|channel program]]''—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices.<ref name="Hannula1974">{{cite book