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Browse Prior Art Database

Self-Timing Card Input-Output System

IP.com Disclosure Number: IPCOM000096234D
Original Publication Date: 1963-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Gaumann, G: AUTHOR

Abstract

In the serially operating input-output system, the number of each card column containing character perforations is punched in such column in the spaces between the normal punched holes. The column number values, which are read by a sensing device separate from the character sensing unit, are used for controlling the setup of the address counter in the processor.

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Self-Timing Card Input-Output System

In the serially operating input-output system, the number of each card column containing character perforations is punched in such column in the spaces between the normal punched holes. The column number values, which are read by a sensing device separate from the character sensing unit, are used for controlling the setup of the address counter in the processor.

The card input unit is in the upper drawing. The character representations are sensed by means of brushes and transmitted via the translator to the processor. Those columns of the cards which contain character perforations are also provided with additional perforations indicating the number of the respective card columns. These additional holes, which are punched in positions close to the guide bar in order to avoid any major misalignments, are accommodated in the spaces between the character perforations.

The column numbers are represented in the binary code. In accordance with the seven bits needed for the numbers from 1 to 80, seven photocells are provided for sensing the column numbers. The outputs of the amplifiers connected to the photocells are coupled with seven column address latches which, in turn, are effective to set up the address counter in the processor for representing the column number being read.

The card output unit in the lower drawing contains a punching device provided with seven additional channels having corresponding punches for punching the co...