The Jargon File

A Chronology...The Jargon FileComputer Dictionary
v. To move wildly or violently, without accomplishing anything useful. Swapping systems which are overloaded waste most of their time moving pages into and out of core (rather than performing useful computation), and are therefore said to thrash.
n.1.Interval of time; basic clock time on the computer. Typically 1/60 second. See JIFFY.
2. In simulations, the discrete unit of time that passes "between" iterations of the simulation mechanism. In AI applications, this amount of time is often left unspecified, since the only constraint of interest is that caused things happen after their causes. This sort of AI simulation is often pejoratively referred to as "tick-tick-tick" simulation, especially when the issue of simultaneity of events with long, independent chains of causes is handwaved.
n.1. An unspecified but usually well-understood time, often used in conjunction with a later time T+1. "We'll meet on campus at time T or at Louie's at time T+1."
2. SINCE (OR AT) TIME T EQUALS MINUS INFINITY: A long time ago; for as long as anyone can remember; at the time that some particular frob was first designed.
v.i. To work; to study. See HACK (def #9).
1.n. A program interrupt, usually used specifically to refer to an interrupt caused by some illegal action taking place in the user program. In most cases the system monitor performs some action related to the nature of the illegality, then returns control to the program. See UUO.
2.v. To cause a trap. "These instructions trap to the monitor." Also used transitively to indicate the cause of the trap. "The monitor traps all input/output instructions."
(titty) n. Terminal of the teletype variety, characterized by a noisy mechanical printer, a very limited character set, and poor print quality. Usage: antiquated (like the TTY's themselves). Sometimes used to refer to any terminal at all; sometimes used to refer to the particular terminal controlling a job.
v. To change slightly, usually in reference to a value. Also used synonymously with TWIDDLE. See FROBNICATE and FUDGE FACTOR.
n. The TOPS-20 operating system by DEC. So named because TOPS-10 was a typically crufty DEC operating system for the PDP-10. BBN developed their own system, called TENEX (TEN EXecutive), and in creating TOPS-20 for the DEC-20 DEC copied TENEX and adapted it for the 20. Usage: DEC people cringe when they hear TOPS-20 referred to as "Twenex", but the term seems to be catching on nevertheless. Release 3 of TOPS-20 is sufficiently different from release 1 that some (not all) hackers have stopped calling it TWENEX, though the written abbreviation "20x" is still used.
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