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IBM System/370
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====System/370 Model 148==== The '''IBM System/370 Model 148''' had the same announcement and withdrawal dates as the Model 138.<ref>{{cite web|url=https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html|title=System/370 Model 148|website=IBM Archives|date=23 January 2003|publisher=IBM|archive-url=https://web.archive.org/web/20230719145815/https://www.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3148.html|archive-date=2023-07-19|url-status=dead}}</ref> As with the option to field-upgrade a 135, a 370/145 could be field-upgraded "at customer locations" to 148-level performance. The upgraded 135 and 145 systems were "designated the Models 135-3 and 145-3."
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