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Before we dive into our main topic, let us first discuss what are shift registers used for. Shift registers have many uses – converting data from series to parallel format (in communication systems, for example), and the reverse of this, up/down counters, ring counters, sequence generators, time delays, and data storage, just to name a few. They are everywhere and very old. It was in 1944 in Bletchly Park in the UK when Tommy Flowers of the GPO built the world’s first shift register using valves (tubes). You can read more about that here.
