Digitizer-to-tape punch-coupling unit
Lindsay Molyneux, E E Schneider, G R Sharp · Journal of Scientific Instruments · 1961
The unit briefly stores the output (twelve binary digits) from an optical or mechanical digitizer and produces signals which will cause a high-speed five-track tape punch to punch the stored information in four rows of holes. Three rows contain the twelve binary digits from the digitizer, while the fourth contains a marker hole and information set on four key switches. Except for the seven valves necessary to drive the tape punch and digitizer light source, the unit uses transistors as its active circuit elements.