Browse Prior Art Database

Reading Punched Cards from Any of Four Orientations

IP.com Disclosure Number: IPCOM000074343D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Armstrong, TG: AUTHOR

Abstract

A punched card may be inserted into a card reading device which reads the card columns serially with any one of the following orientations: (1) column 1 first with proper row orientation; (2) column 1 first with improper row orientation; (3) column 80 first with proper row orientation; and (4) column 80 first with improper row orientation. The information punched into the card may be read correctly regardless of card orientation through the use of special recognition circuits and special punching in the card.

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Reading Punched Cards from Any of Four Orientations

A punched card may be inserted into a card reading device which reads the card columns serially with any one of the following orientations: (1) column 1 first with proper row orientation; (2) column 1 first with improper row orientation; (3) column 80 first with proper row orientation; and (4) column 80 first with improper row orientation. The information punched into the card may be read correctly regardless of card orientation through the use of special recognition circuits and special punching in the card.

An orientation code OC is punched in Column 1 preceding the data. An end- of-data-code EODC is punched into the card following the data. Then the data is again punched into the card in reverse order (the last character first and the first character last) followed, preferably in column 80, by another OC. Punching the data in reverse order on the second half of the card allows the card to be read starting from either column 1 or column 80.

OC is a punch combination that is selected to distinguish between proper and improper row orientation. Any combination of punches that is not symmetrical with respect to the middle of the card column may be used. If a 12-punch is used for the OC, it will be recognized as a 12-punch when row orientation is correct, or as a 9-punch when row orientation is incorrect. The EODC should be a combination of punches that is symmetrical with respect to the middle of the card column (...