History of IBM Mainframe Operating Systems - System/360 Operating Systems - TP Monitors

TP Monitors

System/360's hardware and operating systems were designed for processing batch jobs which in extreme cases might run for hours. As a result they were unsuitable for transaction processing, in which there are thousands of units of work per day and each takes between 30 seconds and a very few minutes. In 1968 IBM released IMS to handle transaction processing, and in 1969 it released CICS, a simpler transaction processing system which a group of IBM's staff had developed for a customer. IMS was only available for OS/360 and its successors, but CICS was also available for DOS/360 and its successors. For many years this type of product was known as a "TP (teleprocessing) monitor". Strictly speaking TP monitors were not operating system components but application programs which managed other application programs. In the 1970s and 1980s several third-party TP monitors competed with CICS (notably Taskmaster, Shadow and Intercomm), but IBM gradually improved CICS to the point where most customers abandoned the alternatives.

Read more about this topic:  History Of IBM Mainframe Operating Systems, System/360 Operating Systems

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