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