dusty deck

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}.