TOPS-10 /tops-ten/ N. DEC's Proprietary OS For The Fabled PDP-10 Machines, Long A Favorite Of Hackers But Now Effectively Extinct.

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TOPS-10 /tops-ten/ n.

DEC's proprietary OS for the
fabled PDP-10 machines, long a favorite of hackers but now
effectively extinct. A fountain of hacker folklore; see Appendix
A. See also ITS, TOPS-20, TWENEX,
operating system. TOPS-10 was sometimes called BOTS-10 (from
`bottoms-ten') as a comment on the inappropriateness of describing
it as the top of anything.