Olympia Werke Ag

Rudolf Schicht

Michael Zander

A circuit arrangement for data processing devices including an input keyboard with keyboard contacts disposed at the points of intersection of a conductor matrix and a multiposition data output device. The data is fed into the data processing device in such a manner that signals furnished cyclically from an electronic control circuit to a series of outputs are fed as control signals to the respective positions of the data output device and, via circuit branches, as interrogation signals to the respective row lines of the keyboard matrix which has its column lines connected to inputs of an electronic decoder for evaluating signals received via closed keyboard contacts. A transistor is disposed at each of the branch points with its emitter-collector path connected between the respective output of the control circuit and the associated position of the data output device. The base of each of the transistors is connected with the associated row line of the keyboard matrix.

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Salzgitter, Germany

Rudolf Schicht