Dusty Deck: N. Old Software (especially Applications) Which One Is Obliged To Remain Compatible With

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:dusty deck: n. Old software (especially applications) which one is
obliged to remain compatible with, or to maintain ({DP} types
call this `legacy code', a term hackers consider smarmy and
excessively reverent). The term implies that the software in
question is a holdover from card-punch days. Used esp. when
referring to old scientific and {number-crunching} software,
much of which was written in FORTRAN and very poorly documented but
is believed to be too expensive to replace. See {fossil};
compare {crawling horror}.
-- The AI Hackers Dictionary