And of course each of these might also be typed with any combination of the control, meta, hyper, and super keys. On this keyboard, you could type over 8000 different characters! This allowed the user to type very complicated mathematical text, and also to have thousands of single-character commands at his disposal. Many hackers were actually willing to memorize the command meanings of that many characters if it reduced typing time (this attitude obviously shaped the interface of EMACS). Other hackers, however, thought having that many bucky bits was overkill, and objected that such a keyboard can require three or four hands to operate. See {bucky bits}, {cokebottle}, {double bucky}, {meta bit}, {quadruple bucky}.
Note: early versions of this entry incorrectly identified the space-cadet keyboard with the `Knight keyboard'. Though both were designed by Tom Knight, the latter term was properly applied only to a keyboard used for ITS on the PDP-10 and modeled on the Stanford keyboard (as described under {bucky bits}). The true space-cadet keyboard evolved from the first Knight keyboard.
:spaceship operator: /n./ The glyph `<=>', so-called apparently because in the low-resolution constant-width font used on many terminals it vaguely resembles a flying saucer. {Perl} uses this to denote the signum-of-difference operation.
:SPACEWAR: /n./ A space-combat simulation game, inspired by E. E. "Doc" Smith's "Lensman" books, in which two spaceships duel around a central sun, shooting torpedoes at each other and jumping through hyperspace. This game was first implemented on the PDP-1 at MIT in 1960—61. SPACEWAR aficionados formed the core of the early hacker culture at MIT. Nine years later, a descendant of the game motivated Ken Thompson to build, in his spare time on a scavenged PDP-7, the operating system that became {{Unix}}. Less than nine years after that, SPACEWAR was commercialized as one of the first video games; descendants are still {feep}ing in video arcades everywhere.
:spaghetti code: /n./ Code with a complex and tangled control structure, esp. one using many GOTOs, exceptions, or other `unstructured' branching constructs. Pejorative. The synonym `kangaroo code' has been reported, doubtless because such code has so many jumps in it.
:spaghetti inheritance: /n./ [encountered among users of object-oriented languages that use inheritance, such as Smalltalk] A convoluted class-subclass graph, often resulting from carelessly deriving subclasses from other classes just for the sake of reusing their code. Coined in a (successful) attempt to discourage such practice, through guilt-by-association with {spaghetti code}.
:spam: /vt.,vi.,n./ [from "Monty Python's Flying Circus">[ 1. To crash a program by overrunning a fixed-size buffer with excessively large input data. See also {buffer overflow}, {overrun screw}, {smash the stack}. 2. To cause a newsgroup to be flooded with irrelevant or inappropriate messages. You can spam a newsgroup with as little as one well- (or ill-) planned message (e.g. asking "What do you think of abortion?" on soc.women). This is often done with {cross-post}ing (e.g. any message which is crossposted to alt.rush-limbaugh and alt.politics.homosexuality will almost inevitably spam both groups). 3. To send many identical or nearly-identical messages separately to a large number of Usenet newsgroups. This is one sure way to infuriate nearly everyone on the Net.
The second and third definitions have become much more prevalent as the Internet has opened up to non-techies, and to many Usenetters sense 3 is now (1995) primary. In this sense the term has apparantly begun to go mainstream, though without its original sense or folkloric freight — there is apparently a widespread belief among {luser}s that "spamming" is what happens when you dump cans of Spam into a revolving fan.
:special-case: /vt./ To write unique code to handle input to or situations arising in a program that are somehow distinguished from normal processing. This would be used for processing of mode switches or interrupt characters in an interactive interface (as opposed, say, to text entry or normal commands), or for processing of {hidden flag}s in the input of a batch program or {filter}.
:speedometer: /n./ A pattern of lights displayed on a linear set of LEDs (today) or nixie tubes (yesterday, on ancient mainframes). The pattern is shifted left every N times the operating system goes through its {main loop}. A swiftly moving pattern indicates that the system is mostly idle; the speedometer slows down as the system becomes overloaded. The speedometer on Sun Microsystems hardware bounces back and forth like the eyes on one of the Cylons from the wretched "Battlestar Galactica" TV series.