The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 24, 1977
Filed:
Dec. 18, 1975
Michael Zander, Braunschweig, DT;
Rudolf Schicht, Salzgitter, DT;
Olympia Werke AG, Wilhelmshaven, DT;
Abstract
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.