Genesis single line, Руководство по эксплуатации и обслуживанию

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single 8 bit byte. To accomplish this the print station takes the upper nibble of
the first 8 bit byte and shifts it into the lower nibble position of the byte, leaving
significant data in the lower nibble and zeroes in the upper nibble. Then a 30H
is added to form the first character to be transmitted. The second character
consist of masking off the upper nibble of the original byte and adding a 30H to
the lower nibble to form the character. For example, if the actual hex data in a
print station is a 47H then a 34H and 37H will be transmitted.