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1 definition found
 for Instruction Address Register
From The Free On-line Dictionary of Computing (30 December 2018) :

  Instruction Address Register
  
      (IAR) The IBM name for program counter.
  
     The IAR can be accessed by way of a supervisor call in
     supervisor state, but cannot be directly addressed in
     problem state.
  
     (1995-03-21)
  

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