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  Interrupt:   10h     Functions:  06h and 07h
 
  Title:       Initialize or Scroll Window
 
  See also:    @Scroll, @Cls
 
  Description:                     [MDA] [CGA] [PCjr] [EGA] [MCGA] [VGA]
 
     Initializes a specified window of the display to ASCII blank
     characters with a given attribute, or scrolls the contents of
     a window by a specified number of lines.
 
     Input                               Output
 
     AH = 06h to scroll up               None
        = 07h to scroll down
     AL = Number of lines to scroll
          (if zero, entire window is
          blanked)
     BH = Attribute to be used for
          blanked area
     CH = y coordinate, upper left
          corner of window
     CL = x coordinate, upper left
          corner of window
     DH = y coordinate, lower right
          corner of window
     DL = x coordinate, lower right
          corner of window
                                    -♦-