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]

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

Execute Channel Program

In IBM mainframe operating systems, Execute Channel Program (EXCP) is a supervisor call 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.

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IBM mainframe

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

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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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Xdap.

References

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

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