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Associative Semi-permanent Memory

IP.com Disclosure Number: IPCOM000097579D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Bruce, GD: AUTHOR

Abstract

On page 18 of this issue of the IBM Technical Disclosure Bulletin there is shown a semi-permanent memory which employs openable magnetic cores and printed circuit cards. By substituting printed circuit cards 4' of the type shown above for the bit plane cards 4 of the semi-permanent memory, the latter is altered for operation in an associative or tag addressed mode.

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Associative Semi-permanent Memory

On page 18 of this issue of the IBM Technical Disclosure Bulletin there is shown a semi-permanent memory which employs openable magnetic cores and printed circuit cards. By substituting printed circuit cards 4' of the type shown above for the bit plane cards 4 of the semi-permanent memory, the latter is altered for operation in an associative or tag addressed mode.

The bit plane card 4' has printed on it a series winding which, by proper punching or otherwise opening selected branch paths, is made to pass through each core 1 in either of two opposite directions. Binary data is recorded on the card by the direction the winding takes through each core. A binary 1 is recorded by opening the branch paths so that the winding, traced from terminal A to terminal B, passes down (toward the bottom of the page) through a selected core. A binary 0 is recorded when the branch paths are opened to cause the winding to pass up through the core.

When the device of page 18 is used as an associative or tag addressed memory, bit plane cards 4' having information recorded on them are stacked on the cores 1 over the selection winding cards 2 and 3. All cores are placed in a reset state. Desired information is located by driving the sense windings of all or some of the bit planes in accordance with the bit values of a search word or tag. The windings of planes corresponding to bit positions in the search word which contain binary 1's are driven with c...