Source : Free On-Line Dictionary of Computing

eighty-column mind
     
         The sort said to be possessed by persons for whom the
        transition from {punched card} to {paper tape} was traumatic
        (nobody has dared tell them about disks yet).  It is said that
        these people, including (according to an old joke) the founder
        of {IBM}, will be buried "face down, 9-edge first" (the 9-edge
        being the bottom of the card).  This directive is inscribed on
        IBM's 1402 and 1622 card readers and is referenced in a famous
        bit of doggerel called "The Last Bug", the climactic lines of
        which are as follows:
     
          He died at the console
          Of hunger and thirst.
          Next day he was buried,
          Face down, 9-edge first.
     
        The eighty-column mind is thought by most {hackers} to
        dominate IBM's customer base and its thinking.
     
        See {fear and loathing}, {card walloper}.
     
        [{Jargon File}]
     
        (1996-08-16)