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  Description:  Initialize or Scroll Down Window      [MDA] [CGA] [PCjr]
                                                      [EGA] [MCGA] [VGA]
 
  Initializes a specified window of the display to ASCII blank characters
  with a given attribute, or scrolls down the contents of a window by a
  specified number of lines.
 
  Input                                                     Output
  ══════════════════════════════════════════════            ═══════
  AH=07H                                                    Nothing
  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
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