Browse Prior Art Database

Ternary Read Only Memory

IP.com Disclosure Number: IPCOM000097950D
Original Publication Date: 1961-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Gahran, HC: AUTHOR [+2]

Abstract

High Speed Reader by Bruce and Shortle, IBM Technical Disclosure Bulletin, Vol. 4, No. 1, June, 1961, page 4, shows a permanent, read only information storage device. It employs a perforated record card constructed of material having flux shielding properties, sandwiched between plates bearing row and column oriented wires. Information, recorded in the form of perforations in the card, is read by sequentially pulsing the wires of one plate, e.g., the column oriented wires, and sensing voltages induced in the wires of the other plate. Inductive coupling between the two groups of wires exists only at the index points on the card where the shield is perforated.

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Ternary Read Only Memory

High Speed Reader by Bruce and Shortle, IBM Technical Disclosure Bulletin, Vol. 4, No. 1, June, 1961, page 4, shows a permanent, read only information storage device. It employs a perforated record card constructed of material having flux shielding properties, sandwiched between plates bearing row and column oriented wires. Information, recorded in the form of perforations in the card, is read by sequentially pulsing the wires of one plate, e.g., the column oriented wires, and sensing voltages induced in the wires of the other plate. Inductive coupling between the two groups of wires exists only at the index points on the card where the shield is perforated.

This read-only memory effects storage and readout of ternary values. This device has a pair of plates 10 and 12 of insulating material in the opposing faces of which wires 11 and 13 are embedded. Wires 11 are drivers and run parallel to the columns of index points on information card 14, placed between plates 10 and 12. Wires 13 sense and extend along the rows of index points on card 14. Wires 13 have the wave-like configuration so that at each index point, the drive and sense windings are in parallel relationship.

Two information cards 14 and 16 are employed to record ternary information. Card 14 is placed between the drive and sense plates 10 and 12. Card 16 is placed so that the sense plate 12 is between it and card 14. Both cards include a sheet of metal foil 15 sandwiched between...