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DOS/360 and successors
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<p>Disk Operating System/360, also DOS/360, or simply DOS, is the discontinued first member of a sequence of <a href="/facts/Operating_system/8XTuvMh2">operating systems</a> for <a href="/facts/IBM_System%2f360/7znvpy4K">IBM System/360</a>, <a href="/facts/System%2f370/TRo1jaFw">System/370</a> and later <a href="/facts/IBM_mainframe/0kPkgADx">mainframes</a>. It was announced by <a href="/facts/IBM/QszA7nwd">IBM</a> on the last day of 1964, and it was first delivered in June 1966. In its time, DOS/360 was the most widely used operating system in the world. </p>