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PCOS: A Process Control Extension to Operating System/360

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1 Author(s)
Calva, J.R. ; IBM General Systems Division at the Laboratory in Rochester, Minnesota 55901, USA

This paper discusses the design and implementation of an extension to IBM Operating System/360 that is called PCOS and is intended specifically for use in “real-time” control of IBM manufacturing processes and testing. The most important part of PCOS is a Real-Time Control Program (RTCP) which is initiated at system start-up time as a “never-ending” task. The RTCP controls the execution of application programs and permits system response to requests for their execution within a time on the order of 100 msec. Other contributions are an “express path” for handling input/output operations, an “interpartition communication” program that provides common core storage for use during the execution of application programs, and an appendage to the OS/360 supervisor program to serve a specially designed high-speed multiplexor called the “transmission control unit.”

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:14 ,  Issue: 6 )