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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-03-19 and was most recently seen on 2026-03-19.
In IBM mainframe operating systems, Execute Channel Program (EXCP) is a 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—a list of device-specific commands (CCWs)—to be executed by I/O channels, control units and devices. EXCP for OS/360 and successors is more specifically described in the OS System Programmer's Guide.; EXCP for DOS/360 and successors is more specifically described in DOS Supervisor and I/O Macros.
This article mostly reflects OS/360 through z/OS; some details are different for TOS/360 and DOS/360 through z/VSE.
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