dinosaur

dinosaur n.  1. Any hardware requiring raised flooring and
   special power.  Used especially of old minis and mainframes, in
   contrast with newer microprocessor-based machines.  In a famous
   quote from the 1988 UNIX EXPO, Bill Joy compared the liquid-cooled
   mainframe in the massive IBM display with a grazing dinosaur "with
   a truck outside pumping its bodily fluids through it".  IBM was
   not amused.  Compare {big iron}; see also {mainframe}.
   2. [IBM] A very conservative user; a {zipperhead}.