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        DW      GETPIXEL        ; Read a pixel from the graphics screen

  Input:
     AX         The x coordinate for the seed point
     BX         The y coordinate for the seed point

  Return:
     DL         The color index of the pixel read from the screen.

GETPIXEL reads the color index value of a single pixel from the graphics
screen. The color index value is returned in the DL register.
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