Because the outputs of {TAIL ~ A/D} converters 1164 and 1169 are represented in twos complement notation, the accumulators 1175, 1176, 1177 and 1178 effectively carry out addition or {HEAD ~ subtraction} by performing only adding operations 
Because the outputs of { TAIL ~ A / D } converters 1164 and 1169 are represented in twos complement notation , the accumulators 1175 , 1176 , 1177 and 1178 effectively carry out addition or { HEAD ~ subtraction } by performing only adding operations
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH