Browse Prior Art Database

Data Compare Feature Modification

IP.com Disclosure Number: IPCOM000083445D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Loeber, NC: AUTHOR

Abstract

This simple modification to commercially available magnetic card and magnetic store typewriters enables ready inventory updating; editing of stock item catalogs, glossary editing for continuing publications and the like; and enhancement of learning processes and grading systems.

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Data Compare Feature Modification

This simple modification to commercially available magnetic card and magnetic store typewriters enables ready inventory updating; editing of stock item catalogs, glossary editing for continuing publications and the like; and enhancement of learning processes and grading systems.

Conventional magnetic card and magnetic store typewriters have one or more card readers 10 and a magnetic data store 12, capable of storing the entire contents of two or more magnetic cards among other components of these versatile typewriters. Switching circuitry 14 is available in most of these typewriters for loading up to four magnetic cards into the store 12. Simple switching circuitry is added for machines that do not have the switching feature, as required for the operations to be described below. Other circuitry and components of these machines are omitted here for clarity.

A compare register 20 of conventional form is coupled by suitable circuitry such as AND gating circuits 22,24 to the store 12. Circuitry 26 is interposed in the control circuitry of the typewriter in a straight-forward fashion, to alter the mode of operation and add the logic circuits necessary to carry out the operations desired.

The compare register 20 is connected to print control circuitry 30, which is interposed in the normal print controlling circuitry for enabling and interrupting the printing operations, as desired, in accordance with the logical operation determined in...