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1 definition found
 for orthogonal instruction set
From The Free On-line Dictionary of Computing (18 March 2015) :

  orthogonal instruction set
  
      An instruction set where all (or most)
     instructions have the same format and all registers and
     addressing modes can be used interchangeably - the choices
     of op code, register, and addressing mode are mutually
     independent (loosely speaking, the choices are
     "{orthogonal").  This contrasts with some early Intel
     microprocessors where only certain registers could be used
     by certain instructions.
  
     Examples include the PDP-11, 680x0, ARM, VAX.
  
     (2002-06-26)
  

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