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     The range of text and graphics coordinates returned by this
     function depends on the current display mode.
 
     On the CGA, the graphics coordinates returned are not continuous.
     The y coordinate is always a multiple of two; the x coordinate is
     either a multiple of four (for 320-by-200 graphics modes) or a
     multiple of eight (for 640-by-200 graphics modes).
 
     Careful selection of background and foreground colors is necessary
     to obtain maximum sensitivity from the light pen across the full
     screen width.
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