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Reference.org
Input/Output Supervisor
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<p>The Input/Output Supervisor (IOS) is that portion of the control program in the <a href="/facts/IBM_mainframe/0kPkgADx">IBM mainframe</a> <a href="/facts/OS/360_and_successors/nQbdNbx6">OS/360</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a> and successors which issues the privileged I/O instructions and supervises the resulting I/O interruptions for any program which requests I/O device operations until the normal or abnormal conclusion of those operations. </p>