TOPS-10
/täpz-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, VMS, 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.
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