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  Description:  Read Graphics Pixel      [CGA] [PCjr] [EGA]
                                               [MCGA] [VGA]
 
  Obtains the current value of the pixel on the display at the specified
  graphics coordinates.
 
  Input                                        Output
  ═════════════════════════════════            ══════════════
  AH=0DH                                       AL=pixel value
  BH=page
  CX=column (graphics x coordinate)
  DX=row (graphics y coordinate)
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