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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Table of Contents

1. 3 relations: Execute Channel Program, Start Input/Output, XPL.

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.

See Execute Direct Access Program and Execute Channel Program

Start Input/Output

In MVS/370 and successor versions of IBM mainframe operating systems, Start Input/Output (STARTIO) is a macro instruction and a "branch entry" for low-level device access, where the programmer is responsible for providing a list of device-specific CCWs, that is, a channel program, to be executed by I/O channels, control units and devices and a number of "exits", several of which may be immediate returns to the Input/Output Supervisor (IOS).

See Execute Direct Access Program and Start Input/Output

XPL

XPL, for expert's programming language is a programming language based on PL/I, a portable one-pass compiler written in its own language, and a parser generator tool for easily implementing similar compilers for other languages.

See Execute Direct Access Program and XPL

References

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

Also known as Xdap.

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