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Line 2: {{short description\|Operating System low level I/O API}} {{more citations needed\|date=June 2012}} In [[IBM mainframe]] [[operating system]]s, '''Execute Channel Program''' ('''EXCP''') is a [[Macro (computer science)\|macro]] generating a [[system call]], implemented as a [[Supervisor Call instruction]], 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 \| author=Reino Hannula \| title=Computers and Programming: A System/360-370 Assembler Language Approach

Execute Channel Program: Difference between revisions