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.