In these figures, and indicate the position directed by the contents of the DPA counter to represent {HEAD ~ the position} for starting {TAIL ~ the display} 
In these figures , and indicate the position directed by the contents of the DPA counter to represent { HEAD ~ the position } for starting { TAIL ~ the display }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL