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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   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)