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, 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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TOPS-20 /tops-twen'tee/ n.
See TWENEX.