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  Include:   BIOS.INC
 
  Syntax:    @Scroll dist [,[attr][,[upcol [,[uprow [,[dncol][,dnrow]]]]]]]
 
  Summary:   Scrolls a specified window up or down
 
  Arguments: <dist>      8-bit number of lines to scroll; positive
                         scrolls down; negative scrolls up; 0 clears.
 
             <attr>      8-bit attribute for blank lines; if none
                         given, 07h (white on black).
 
             <upcol>     Upper left column; if none given, CL used.
 
             <uprow>     Upper left row; if none given, CH used.
 
             <dncol>     Lower right column; if none given, DL used.
 
             <dnrow>     Lower right row; if none given, DH used.
 
  Returns:   No return value
 
  Modifies:  AX, CX, DX, BH
 
  See also:  Int 10h Functions 06h and 07h
                                    -♦-