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  Description:  Enable/Disable Video      [MCGA] [VGA]
 
  Enables or disables CPU access to the video adapter's I/O ports and video
  refresh buffer.
 
  Input                               Output
  ════════════════════════            ═════════════════════
  AH=12H                              If function supported
  AL=00H to enable access             AL=12H
     01H to disable access
  BL=32H
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