A teleprinter is a type of electromechanical output device. A teleprinter can send and receive typed messages, including sending typed data to a computer and printing the response. The WITCH can be connected to a teleprinter that punches out program results on paper tape as a series of holes.
Creed's Model 75 teleprinter was small in size and extremely light weight in comparison to its predecessors. One interesting feature of the Model 75 was its' ability to operate in non-level positions, subject to tilting and vibration. As a result of this characteristic, Model 75 teleprinters were adopted by the British Overseas Airways Corporation for use on their aircraft to enable the in-flight reception of critical flight information and weather data. Depending on which attachments have been fitted to it, the Model 75 teleprinter is capable of processing information in the form of: a standard printed page, punched paper tape and edge punched cards, making it outstandingly versatile. At the time, it was the fastest teleprinter available on the market, making it ideal for working with computers.