Related:

• backward combatability /bak'w*rd k*m-bat'*-bil'*-tee/ n.
  [CMU, Tektronix: from `backward compatibility'] A property of hardware or software revisions in which previous protocols, formats, layouts, etc....
• flag day: n. A software change that is neither forward- nor backward-compatible, and which is costly to make and costly to reverse.
  Can we install that without causing a flag day for all users?...
• flag day n. A software change that is neither forward- nor backward-compatible, and which is costly to make and costly to reverse.
  Can we install that without causing a flag day for all users?...
• ALL NEW ............
• BSD /B-S-D/ n. [abbreviation for `Berkeley Software Distribution'] a family of Unix versions for the DEC VAX and PDP-11 developed by Bill Joy and others at Berzerkeley starting around 1980
  incorporating paged virtual memory, TCP/IP networking enhancements, and many other features....
• etrocomputing: /ret'-roh-k*m-pyoo'ting/ n. Refers to emulations of way-behind-the-state-of-the-art hardware or software, or implementations of never-was-state-of-the-a
  esp. if such implementations are elaborate practical jokes and/or parodies, written mostly for {hack value}, of more `serious' designs....
• General Public Virus: n. Pejorative name for some versions of the {GNU} project {copyleft} or General Public License (GPL)
  which requires that any tools or {app}s incorporating copylefted code must be source-distributed on the same counter-commercial terms as GNU stuff....
• cascade: n. 1. A huge volume of spurious error-message output produced by a compiler with poor error recovery.
  Too frequently, one trivial syntax error (such as a missing `)' or `}') throws the parser out of synch so that much of the remaining program text is interpreted as garbaged or ill-formed....
• 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)....