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Reference.org
MOS (operating system)
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<p>Mobile Operating System is an <a href="/facts/Operating_system/8XTuvMh2">operating system</a>, a <a href="/facts/Soviet_Union/m7wWsPto">Soviet</a> <a href="/facts/Clone_(computing)/qd7EcVNT">clone</a> of <a href="/facts/Unix/0pNL2seI">Unix</a> from the 1980s. </p>