The TOPS-10 reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

TOPS-10

The TOPS-10 System was a computer operating system from Digital Equipment Corporation (DEC) for the PDP-10 released in 1964.

TOPS-10 had an interesting scheduler of having many run queues, unlike OpenVMS, for example that has two run queues and processes are inserted into the queue depending on process priority. The TOPS-10 Operating System also included User file and Device independance. Code concepts developed for TOPS-10 ended up in RSX-11 that ultimately ended up in OpenVMS. These same operating system design ideas can probably be traced to current Operating Systems like Microsoft's Windows NT.

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