Special Real Time Operating System
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| name = Special Real Time Operating System (SRTOS)
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| developer = IBM
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| working state = Discontinued
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| released = {{Start date and age|1976}}
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Special Real Time Operating System (SRTOS) is a discontinued IBM real time operating system, originally designed for use in the electricity industry, but later also applied in other areas of industrial process control.{{cite book |url=https://archive.org/details/bitsavers_ibm370SRTOalTimeOperatingSystemDescriptionandOpera_21076855 |format=PDF |title=IBM System/370 Special Real Time Operating System Programming RPQ Z06751 Description and Operation Manual |publisher=IBM |date=November 1984 |accessdate=2016-09-24 }}{{cite book|title=Mini/Micro Northeast conference record|publisher=Electronics Conventions|year=1984|page=38|oclc=10327934}}Advances in Instrumentation: Proceedings of the ISA International Conference and Exhibit, Volume 43, Parts 1-4, Instrument Society of America, 1988, p. 104 It formed part of the Realtime Plant Management System (RPMS) and Advanced Control System (ACS).{{Cite web |title=ADVANCED CONTROL SYSTEM VERSION 2 AND REALTIME PLANT MANAGEMENT SYSTEM |url=http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/877/ENUSZP86-0320/index.html&lang=en&request_locale=en |archive-url=https://web.archive.org/web/20160927031744/http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/877/ENUSZP86-0320/index.html&lang=en&request_locale=en |archive-date=27 September 2016 |access-date=1 September 2024}} Rather than a standalone operating system, it was designed as an extension to the OS/VS1 and OS/VS2 (later MVS) operating systems. It was also used in the paper industry.TAPPI Journal (Technical Association of the Pulp and Paper Industry), 1991, p. 270 SRTOS was originally released in 1976, and though no longer supported as a program product, it is currently used as part of several ACS and RPMS installations worldwide.