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1 definition found
 for IBM PC AT
From The Free On-line Dictionary of Computing (18 March 2015) :

  IBM PC AT
  AT
  PC AT
  
      ("Advanced Technology") A version of the IBM PC,
     released in Aug 1984 with an Intel 80286 processor, a 16-bit
     bus, a medium-speed hard disk and a 1.2 megabyte
     floppy disk drive.  It had a larger case than the PC,
     which allowed it to accept "{tall cards".
  
     The AT keyboard corrected the PC's non-standard placement of
     the return and left shift keys but shortened the backspace
     key, making it harder to reach.
  
     (1995-03-01)
  

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