rs6k

from The Free On-line Dictionary of Computing (8 July 2008)

RISC System/6000
RS6000
RS/6000
RS6K

   <computer> (Or "RS/6000") {IBM}'s current {RISC}-based {Unix}
   computer.  The RS/6000, announced in 1990, replaced the
   {RT-PC}.  It runs {AIX} 3.x and 4.x.  Most models have an
   {MCA} bus.  A wide range of models are available.

   (1995-04-06)