Execute Channel Program in Real Storage: Difference between revisions

Revision as of 20:50, 27 November 2012

Revision as of 13:34, 28 November 2012

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{{ref improve|date=June 2012}}

{{sections|date=June 2012}}

{{Mainframe I/O access methods}}

In [[IBM mainframe]] [[operating system]]s, '''Execute Channel Program in Real Storage''' ('''EXCPVR''') is a supervisor call for low-level device access, where the programmer is responsible for providing a list of device-specific [[Channel_command_word#Channel_command_words|CCWs]], that is, a [[Channel_program#Channel_Program|channel program]], to be executed by I/O channels, control units and devices. Additionally, the programmer is expected and required to ensure that the input/output data areas are in real storage and are "fixed".