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