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Reference.org
RC 4000 multiprogramming system
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<p>The RC 4000 Multiprogramming System (also termed Monitor or RC 4000 depending on reference) is a discontinued <a href="/facts/Operating_system/8XTuvMh2">operating system</a> developed for the RC-4000 third generation computer in 1969. For clarity, this article mostly uses the term Monitor. </p>