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