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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 by this function are not
    continuous. The y coordinate is always a multiple of two; the x coordin-
    ate 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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