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Revision Date Username Comment
903 Oct 2013 - 15:55norqu036? 
802 May 2013 - 09:14NicLewis 
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618 Mar 2013 - 09:31NicLewis 
514 Mar 2013 - 09:21NicLewis 
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You are here: UMWiki>CBI_ComputerSecurity Web>Systems>SystemsIBMTSS (03 Oct 2013, norqu036)

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Announced with the System/360, the IBM Time Sharing System (TSS/360) was a time-sharing operating system intended for use on the Model 67 S/360 mainframe computer as a competitor to the Multics time-sharing OS. While most mainframe computing during the 1960s consisted of batch-processing, with one user utilizing computer resources at a time, a time-sharing operating system allows for multiple simultaneous users at the same time. Due to the high cost and limited availability of computers in the early computing era, allowing for multiple simultaneous users was a more efficient use of computer resources than batch-processing. Multics and TSS/360 were early attempts at time-sharing, with both suffering difficulties in development due to the complexity of implementing what were among the most complex software projects of the time. The TSS/360 OS experienced numerous difficulties in reliability and performance, and initially lacked compatibility with OS/360. IBM canceled the TSS/360 project twice, bringing the project back into development after the time-sharing community objected, but conclusively canceled the project in 1971. IBM redirected its efforts into a time-sharing monitor for OS/360, called the Time Sharing Option (TSO).(1)(2)

Additional Resources:


1 : Emerson W. Pugh, et al., IBM's 360 and Early 370 Systems, Cambridge, MA (The MIT Press, 1991), 362-365, 367, 479, 596-597, 630-631, 638.

2 : lock IBM-TSS.pdf, pp. 1-2. -Original IBM TSS/360 Sales and Systems Guide. (Login required)

Topic revision: r9 - 03 Oct 2013 - 15:55:38 - norqu036
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