Not flattering. 2. [from `deadhead'] A Grateful Dead fan working
at DEC.

:deckle: /dek'l/ /n./ [from dec- and {nybble}; the original
spelling seems to have been `decle'] Two {nickle}s; 10
bits. Reported among developers for Mattel's GI 1600 (the
Intellivision games processor), a chip with 16-bit-wide RAM but
10-bit-wide ROM. See {nybble} for other such terms.

:DED: /D-E-D/ /n./ Dark-Emitting Diode (that is, a burned-out
LED). Compare {SED}, {LER}, {write-only memory}. In the
early 1970s both Signetics and Texas instruments released DED spec
sheets as {AFJ}s (suggested uses included "as a power-off
indicator").

:deep hack mode: /n./ See {hack mode}.

:deep magic: /n./ [poss. from C. S. Lewis's "Narnia"
books] An awesomely arcane technique central to a program or
system, esp. one neither generally published nor available to
hackers at large (compare {black art}); one that could only have
been composed by a true {wizard}. Compiler optimization
techniques and many aspects of {OS} design used to be {deep
magic}; many techniques in cryptography, signal processing,
graphics, and AI still are. Compare {heavy wizardry}. Esp.
found in comments of the form "Deep magic begins here...".
Compare {voodoo programming}.

:deep space: /n./ 1. Describes the notional location of any
program that has gone {off the trolley}. Esp. used of