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IBM System/370
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====System/370 Model 158==== The '''IBM System/370 Model 158''' and the 370/168 were announced Aug 2, 1972.<ref name="IBM370.158">{{cite web|url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3158.html|title=System/370 Model 158|website=IBM Archives|date=23 January 2003|publisher=IBM|archive-url=https://web.archive.org/web/20210301143132/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3158.html|archive-date=2021-03-01|url-status=dead}}</ref> It included dynamic address translation (DAT) hardware, a prerequisite for the new [[virtual memory]] operating systems (DOS/VS, OS/VS1, OS/VS2). A tightly coupled multiprocessor (MP) model was available, as was the ability to loosely couple this system to another 360 or 370 via an optional channel-to-channel adapter. The 158 and 168 were withdrawn on September 15, 1980.
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