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   disp_scroll

   #include <disp.h>

   void  disp_scroll(int lines,unsigned ulrow,unsigned  ulcol,   unsigned
   lrrow,unsigned lrcol,unsigned attr);

   Description
   Scrolls the screen up:
   linesnumber of lines to scroll (if lines <0, scrolls the area down)
   ulrow     upper left row of display area
   ulcol     upper left column of display area
   lrrow     lower right row of display area
   rcol      lower right column of display area
   attr      video attribute to use on uncovered areas.

   Example
   #include <disp.h>
   main()
   {
        disp_open();
        disp_scroll(disp_numrows,0,0,disp_numrows-1,disp_numcols/2,
               DISP_NORMAL);
        disp_close();
   }