Browse Prior Art Database

Factorial Select Core Memory

IP.com Disclosure Number: IPCOM000097165D
Original Publication Date: 1962-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Gamblin, RL: AUTHOR

Abstract

The magnetic core planar array utilizes a winding arrangement which permits core selection by a minimum number of drive lines. The magnetic cores 12 are arranged in a single plane and are indicated by circles. A three out of eight drive scheme is used. Each drive line 11, when energized, has a one-third select current flowing through it.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Factorial Select Core Memory

The magnetic core planar array utilizes a winding arrangement which permits core selection by a minimum number of drive lines. The magnetic cores 12 are arranged in a single plane and are indicated by circles. A three out of eight drive scheme is used. Each drive line 11, when energized, has a one-third select current flowing through it.

For selecting a core in the array, three of the eight lines are energized with a positive voltage. The other five lines are energized with a negative voltage. This three out of eight scheme permits the array to have a maximum number of fifty- six cores.

Three drive lines are wound through each core. The particular winding combination for each core is indicated by the numbers above the core. For example, drive lines 1, 2 and 3 are wound through the uppermost left-hand core. Drive lines 1, 2 and 4 are wound through the next horizontally adjacent core, etc. The cores other than the selected core have current flowing through them. The total current flowing in nonselected cores is not more than half-select current. Thus, this current does not effect the stable state of the non-selected cores.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]