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       ggiSetSplitline - Set the hardware split line feature


       #include <ggi/misc.h>

       int ggiSetSplitline(ggi_visual_t vis, int y);


       Original  VGA  adaptors  in  order  to  be  efficient  when  displaying
       vertically scrolling scenery implemented a feature that, when  used  in
       combination  with  the  display origin, could cause the screen to wrap.
       This essentially means you can take the framebuffer and seamlessly join
       the  top  edge to the bottom edge, creating a cylinder of data that you
       could scroll  up  or  down  without  actually  performing  memory  move
       operations.   This  functions sets the y coordinate at which the screen
       wraps back.


       0 for OK, otherwise an ggi-error(3) code.