Related:

• 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}....
• TOPS-20 /tops-twen'tee/ n. See TWENEX.
• VMS: /V-M-S/ n. DEC's proprietary operating system for its VAX minicompute
  one of the seven or so environments that loom largest in hacker folklore....
• VMS /V-M-S/ n. DEC's proprietary operating system for its VAX minicompute
  one of the seven or so environments that loom largest in hacker folklore....
• PDP-10: [Programmed Data Processor model 10] n. The machine that made timesharing real.
  It looms large in hacker folklore because of its adoption in the mid-1970s by many university computing facilities and research labs, including the MIT AI Lab, Stanford, and CMU....
• PDP-10 n. [Programmed Data Processor model 10] The machine that made timesharing real.
  It looms large in hacker folklore because of its adoption in the mid-1970s by many university computing facilities and research labs, including the MIT AI Lab, Stanford, and CMU....
• PDP-20: n. The most famous computer that never was.
  {PDP-10} computers running the {{TOPS-10}} operating system were labeled `DECsystem-10' as a way of differentiating them from the PDP-11....
• TWENEX /twe'neks/ n. The TOPS-20 operating system by DEC -- the second proprietary OS for the PDP-10 -- preferred by most PDP-10 hackers over TOPS-10 (that i
  by those who were not ITS or WAITS partisans). TOPS-20 began in 1969 as Bolt, Beranek &...
• ITS /I-T-S/ n. 1. Incompatible Time-sharing System, an influential though highly idiosyncratic operating system written for PDP-6s and PDP-10s at MIT and long used at the MIT AI Lab.
  Much AI-hacker jargon derives from ITS folklore, and to have been `an ITS hacker' qualifies one instantly as an old-timer of the most venerable sort....