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OS/VS1
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<p>Operating System/Virtual Storage 1, or OS/VS1, is a discontinued <a href="/facts/IBM_mainframe/0kPkgADx">IBM mainframe</a> computer <a href="/facts/Operating_system/8XTuvMh2">operating system</a> designed to be run on <a href="/facts/IBM/QszA7nwd">IBM</a> <a href="/facts/System/370/TRo1jaFw">System/370</a> hardware. It was the successor to the <a href="/facts/OS/360_and_successors/nQbdNbx6">Multiprogramming with a Fixed number of Tasks (MFT)</a> option of <a href="/facts/System/360/7znvpy4K">System/360</a>'s operating system <a href="/facts/OS/360_and_successors/nQbdNbx6">OS/360</a>. OS/VS1, in comparison to its predecessor, supported <a href="/facts/Virtual_memory/Lw2GemF5">virtual memory</a> (then called <i>virtual storage</i>). OS/VS1 was generally available during the 1970s and 1980s, and it is no longer supported by IBM. </p>