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    In video modes that support multiple pages, this function affects only
    the page currently being displayed.
 
    If AL contains a value other than 00H, the area within the specified
    window is scrolled down by the requested number of lines. Text that is
    scrolled beyond the bottom of the window is lost. The new lines that ap-
    pear at the top of the window are filled with ASCII blanks carrying the
    attribute specified by register BH.
 
    To scroll up the contents of a window, see Int 10H Function 06H.
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