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Browse Prior Art Database

Cathode Ray Tube Shift Unit

IP.com Disclosure Number: IPCOM000098766D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Cochrane, HW: AUTHOR

Abstract

In electronic digital computers it is often necessary to shift digital data in certain digital orders of an input register to other digital orders of an output register.

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Cathode Ray Tube Shift Unit

In electronic digital computers it is often necessary to shift digital data in certain digital orders of an input register to other digital orders of an output register.

The drawing shows a cathode ray tube shift array which is capable of selectively shifting digital data in the input register as much as two positions to the right or left during a transfer to the output register. Each cathode ray tube has five vertical, metallic targets along the large end of the cathode ray tube envelope. Electrical connections extending outside the envelope are attached to each target as shown. For the purpose of illustration, each of the digital orders of the input and output registers is a binary coded decimal counter. Similarly, each vertical column of four cathode ray tubes represents a binary coded decimal array.

The five possible shifts of the data are shown as inputs to a digital to analog converter, the output of which is connected to a vertical deflection plate of each of the cathode ray tubes. If a shift 0 is selected, there is no output from the digital to analog converter and no deflection of the beams by the vertical deflection plates, so that any beam which is present in the cathode ray tube falls on the center metallic target. A selection of a left shift 1 input to the digital to analog converter produces a potential on each of the vertical deflection plates so as to cause the beam to move upward one metallic target. A left shift 2 causes a movement up...