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Testing Magnetic Core Planes

IP.com Disclosure Number: IPCOM000098872D
Original Publication Date: 1958-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Myers, AS: AUTHOR [+2]

Abstract

Memory core planes having mutually perpendicular address wires X and Y, an inhibit wire Z and a sense wire S, as shown, in the upper figure, may be tested in the following manner: 1) Full write pulses are impressed on the S wire, 2) Half read and half write pulses are impressed on the Z wire, 3) Full read pulses are impressed on successive individual X wires, and, 4) Output pulses are sensed on successive individual Y wires.

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Testing Magnetic Core Planes

Memory core planes having mutually perpendicular address wires X and Y, an inhibit wire Z and a sense wire S, as shown, in the upper figure, may be tested in the following manner: 1) Full write pulses are impressed on the S wire,

2) Half read and half write pulses are impressed

on the Z wire,

3) Full read pulses are impressed on successive

individual X wires, and,

4) Output pulses are sensed on successive individual Y

wires.

By selecting successive combinations of X and Y wires, each core may be tested individually.

A preferred test sequence (shown in lower diagram) for each core is as follows:

1) Impress a full write pulse on the S wire, then Impress a full read pulse on a selected X wire and Sense an undisturbed output pulse uV(1) on the selected Y wire.

2) Impress a full write pulse on the S wire, then Impress a series of half read pulse on the Z wire, then Impress a full read pulse on the selected X wire and Sense a read disturbed output pulse rV(1) on the selected Y wire.

3) After impressing a full read pulse on the selected X wire, then Coincidently impress a full write pulse on the S wire and a half read pulse on the Z wire, then Impress a series of half write pulses on the Z wire, then Impress a full read pulse on the selected X wire and Sense a write disturbed output pulse wV(o) on the selected Y wire.

The individual core parameters can be tested by requiring that each of the outputs sensed meet certain minimum and maximum le...