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Temperature Compensated Control for Array Drive

IP.com Disclosure Number: IPCOM000097209D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Cooper, TS: AUTHOR [+2]

Abstract

The apparatus is a controlled current supply for a magnetic core matrix, not shown, used in the IBM Type 1401 machine.

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Temperature Compensated Control for Array Drive

The apparatus is a controlled current supply for a magnetic core matrix, not shown, used in the IBM Type 1401 machine.

Current sources 11 and 12 for an A matrix and 13 and 14 for a B matrix provide selected coordinate half-currents to set a core in the A B matrices to a 1 state. Upon termination of the selecting halfcurrents, the selected cores are returned to an 0 state by bias windings 9 and 10 threading all cores in both matrices, respectively.

Windings 9 and 10 conduct current continuously to sources 11... 14, which, by circuits not shown, utilize this same current to select a particular core in both matrices. The current through coils 9 and 10 is four times that conducted by any given X or Y driver
11... 14. By this arrangement, the amount of current used in selecting a core in the A matrix, e. g., is always properly proportioned to the current flow through bias winding 9. Thus, the current through winding 9 tending to set all cores in the A matrix to a 0 state is kept in exact proportion to the current necessary to momentarily set any given core to a 1 state. The windings on the coils 9 and 10 and the X and Y coordinate selecting coils each have the required number of turns such that the required magnetic field is generated.

Magnetic cores require higher drive current at reduced temperatures. To provide for this, a series of thermal switches 2, 3 and 4 are connected in parallel between potential source 15 and...