INT 10H 0dH: Read Graphics Pixel

                                                          Compatibility: All 
 Expects: AH    0dH
          BH    video page (0-based)
          CX    graphics column
          DX    graphics row
          ──────────────────────────────────────────────────────────────────
 Returns: AL    color value of dot at specified position
          ──────────────────────────────────────────────────────────────────
    Info: This obtains the color value of the dot at the specified graphics
          screen location.

          The BIOS provides very little graphics drawing support.  To use
          graphics with reasonable speed, you must access video memory
          directly.  See Video Memory Layouts.

See Also: INT 10H 0cH (write graphics pixel)
          INT 10H: Video Services
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