Data is transmitted to the printer under {TAIL ~ control} of the microprocessor 30 through a dual 4 bit latch 62 and {HEAD ~ the buffers} 64,66 
Data is transmitted to the printer under { TAIL ~ control } of the microprocessor 30 through a dual 4 bit latch 62 and { HEAD ~ the buffers } 64,66
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH