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Revision Date Username Comment
603 Oct 2013 - 16:04norqu036? 
502 May 2013 - 09:51NicLewis 
418 Mar 2013 - 09:57NicLewis 
315 Mar 2013 - 11:21NicLewis 
225 Feb 2013 - 10:38NicLewis 
121 Feb 2013 - 09:13NicLewis 

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You are here: UMWiki>CBI_ComputerSecurity Web>Systems>SystemsTSO (03 Oct 2013, norqu036)

Current Activitieslock Who is Who?lock People Programs Publications CSHW_2014 Systems Events Mechanisms



Time Sharing Option (TSO) was a time-sharing environment for IBM mainframe operating systems. TSO allowed multiple users to log into a mainframe operating system simultaneously, and remain unaware of other users. Introduced in 1971, TSO was offered as an option for the MVT variant of IBM's OS/360 operating system.(1) TSO was not IBM's first time-sharing product for its line of mainframe computers, as the Time Sharing System (TSS) was originally announced with the System/360, and was made available to a limited number of customers for testing in 1967. TSO replaced the TSS operating system in 1971, after TSS failed to meet IBM's expectations.(2) In 1974, TSO became a standard feature of IBM high-end mainframe computers equipped with the new MVS operating system, which facilitated the multitasking and multiprocessing capabilities of particular benefit for time-sharing. Offering a Unix-style environment, TSO functions in both batch mode, and a real-time interactive mode, using either a command-line interface, or a menu system. TSO remains in use on the IBM z/OS operating system, the successor to OS/390.(3)(4)(5)


1 : lock IBM, "IBM System/360 Operating System: Time Sharing Option Guide, OS Release 21," (IBM Systems Reference Library, 1972), 9-11. (Login required)

2 : Emerson W. Pugh, et al., 360 and Early 370 Systems, Cambridge, MA (The MIT Press, 2001), 355, 365.

3 : http://publib.boulder.ibm.com/infocenter/zos/basics/index.jsp?topic=/com.ibm.zos.zconcepts/zconc_whatistso.htm

4 : lock IBM, z/OS Concepts, IBM (z/OS Basic Skills Information Center, 2006, 2010), 59-60. (Login required)

5 : lock Bob DuCharme, The Operating System Handbook: Or, Fake Your Way Through Minis and Mainframes, (McGraw-Hill, 2001), 3. (Login required)

Topic revision: r6 - 03 Oct 2013 - 16:04:11 - norqu036
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