Execute Direct Access Program

In IBM mainframe operating systems, Execute Direct Access Program (XDAP) is a pseudo access method for accessing direct access datasets on a block by block basis. ^[1]

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1. 3 relations: Execute Channel Program, IBM mainframe, Operating system.

Execute Channel Program

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. Execute Direct Access Program and execute Channel Program are computer file formats and IBM mainframe operating systems.

See Execute Direct Access Program and Execute Channel Program

IBM mainframe

IBM mainframes are large computer systems produced by IBM since 1952.

See Execute Direct Access Program and IBM mainframe

Operating system

An operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs.

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References

[1] https://en.wikipedia.org/wiki/Execute_Direct_Access_Program

Also known as Xdap.

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