Communications: electrical – Digital comparator systems
Patent
1975-12-18
1977-05-24
Yusko, Donald J.
Communications: electrical
Digital comparator systems
340365S, 340336, G06F 302, G02F 118
Patent
active
040258998
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.
REFERENCES:
patent: 3483553 (1969-12-01), Blankenbaker
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 3922668 (1975-11-01), Kishimoto et al.
Schicht Rudolf
Zander Michael
Olympia Werke AG
Yusko Donald J.
LandOfFree
Circuit arrangement for data input and output in data processing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit arrangement for data input and output in data processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for data input and output in data processing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-540410