Related:

• operating system n. [techspeak] (Often abbreviated `OS') The foundation software of a machine
  hat which schedules tasks, allocates storage, and presents a default interface to the user between applications....
• 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....
• LPT: /L-P-T/ or /lip'it/ or /lip-it'/ n. Line printer, of course.
  Rare under UNIX, more common among hackers who grew up with ITS, MS-DOS, CP/M and other operating systems that were strongly influenced by early DEC conventions....
• 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}....
• CP/M:: /C-P-M/ n. [Control Program for Microcomputers] An early microcomputer {OS} written by hacker Gary Kildall for 8080- and Z80-based machine
  very popular in the late 1970s but virtually wiped out by MS-DOS after the release of the IBM PC in 1981....
• MS-DOS:: /M-S-dos/ [MicroSoft Disk Operating System] n.
  A {clone} of {{CP/M}} for the 8088 crufted together in 6 weeks by hacker Tim Paterson, who is said to have regretted it ever since....
• CTSS: /C-T-S-S/ n. Compatible Time-Sharing System. An early (1963) experiment in the design of interactive time-sharing operating systems, ancestral to {{Multics}}, {{UNIX}}, and {{ITS}}.
  The name {{ITS}} (Incompatible Time-sharing System) was a hack on CTSS, meant both as a joke and to express some basic differences in philosophy about the way I/O services should be presented to user programs....
• GCOS:: /jee'kohs/ n. A {quick-and-dirty} {clone} of System/360 DOS that emerged from GE around 1970
  originally called GECOS (the General Electric Comprehensive Operating System)....
• 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....