DIWSTRT

         These registers control the display window size and position,
         by locating the upper left and lower right corners.


         BIT# 15  14  13  12  11  10  09  08  07  06  05  04  03  02  01  00
         USE  V7  V6  V5  V4  V3  V2  V1  V0  H9  H8  H7  H6  H5  H4  H3  H2


         DIWSTRT is vertically restricted to the upper 2/3
         of the display (V8=0) and horizontally restricted to
         the left 3/4 of the display (H8=0).


         DIWSTOP is vertically restricted to the lower 1/2
         of the display (V8=/V7) and horizontally restricted
         to the right 1/4 of the display (H8=1).


SEE ALSO: DIWHIGH, DDFSTRT, STOP