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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 up by the requested number of lines. Text that is
    scrolled beyond the top of the window is lost. The new lines that appear
    at the bottom of the window are filled with ASCII blanks carrying the
    attribute specified by register BH.
 
    To scroll down the contents of a window, see Int 10H Function 07H.
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