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Multi-Purpose Logical Array

IP.com Disclosure Number: IPCOM000097006D
Original Publication Date: 1962-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Kahn, AA: AUTHOR [+2]

Abstract

The single logic unit is programmed to perform a multiplicity of different logical functions. The Reset winding, when energized, switches all cores of the upper row to the zero state and all cores of the bottom row to the one state. The Read winding, when energized, switches all cores to the zero state. The Sense winding, at read time, gives an output voltage as the net sum of positive voltages induced by each upper row core switching from one to zero state and of negative voltages induced by each bottom row core switching also from one to zero state.

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Multi-Purpose Logical Array

The single logic unit is programmed to perform a multiplicity of different logical functions. The Reset winding, when energized, switches all cores of the upper row to the zero state and all cores of the bottom row to the one state. The Read winding, when energized, switches all cores to the zero state. The Sense winding, at read time, gives an output voltage as the net sum of positive voltages induced by each upper row core switching from one to zero state and of negative voltages induced by each bottom row core switching also from one to zero state.

The input windings A, B and C, when energized, switch cores 1, 3 and 5 to the one state and cores 2, 4 and 6 to the zero state, respectively. Control winding D(1), when energized, switches core 7 to the one state and core 8 to the zero state. Control winding D(2), when energized, switches both 7 and 9 cores to the one state and both 8 and 10 cores to the zero state.

Assuming that the matrix is reset and control winding D(1) is energized, input pulses are applied to windings A and C. At read time cores 1, 3 and 7 induce a positive voltage and cores 4 and 10 a negative voltage on the sense winding. The net effect on the sense winding results in a positive output voltage. So programmed, the array operates as a 2 out of 3-way AND. If neither control winding is energized, the unit operates as a 3-way AND. If control winding D(2) is energized, the unit operates as an OR.

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