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Xerox Operating System
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<p>The Xerox Operating System (XOS) was an operating system for the <a href="/facts/Scientific_Data_Systems/E6m5jUpC">XDS</a> <a href="/facts/SDS_Sigma_series/56e0aEVA">Sigma series</a> of computers "optimized for direct replacement of <a href="/facts/IBM/QszA7nwd">IBM</a> <a href="/facts/DOS/360_and_successors/bT9PzVHd">DOS/360</a> installations" and to provide <a href="/facts/Real-time_operating_system/IvUCFwCL">real-time</a> and <a href="/facts/Timesharing/LE5XT9Go">timesharing</a> support. </p><p>The system was developed, beginning in 1969, for Xerox by the <a href="/facts/France/CxIeIKM3">French</a> firm CII (now <a href="/facts/Groupe_Bull/tlbdToLt">Bull</a>). </p><p>XOS was more successful in <a href="/facts/Europe/DTAtrKfh">Europe</a> than in the <a href="/facts/US/P0sCdLe5">US</a>, but was unable to compete with <a href="/facts/IBM/QszA7nwd">IBM</a>. By 1972 there were 35 XOS installations in Europe, compared to 2 in the US. </p>