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Lexikon


ferrite core memory


(Or "core") An early form of ref="module.php?name=Lexikon&file=search&eid=1&query=non-volatile storage">non-volatile storage built (by hand) from tiny rings of magnetisable material threaded onto very fine wire to form large (e.g. 13"x13" or more) rectangluar arrays. Each core stored one ref="module.php?name=Lexikon&file=search&eid=1&query=bit">bit of data. These were sandwiched between ref="module.php?name=Lexikon&file=search&eid=1&query=printed circuit boards">printed circuit boards(?). Sets of wires ran horizontally and vertically and where a vertical and horizontal wire crossed, a core had both wires threaded through it. A single core could be selected and magnetised by passing sufficient current through its horizontal and vertical wires. A core would retain its magnetisation until it was re-magnetised. The two possible polarities of magnetisation were used to represent the binary values zero and one. A third "sense" wire, passed through the core and, if the magnetisation of the core was changed, a small pulse would be induced in the sense wire which could be detected and used to deduce the core' s original state. Some core memory was immersed in a bath of heated oil to improve its performance. Core memory was rendered obsolete by ref="module.php?name=Lexikon&file=search&eid=1&query=semiconductor">semiconductor memory. For example, the 1970s-era ref="module.php?name=Lexikon&file=search&eid=1&query=NCR 499">NCR 499 had two boards, each with 16 ref="module.php?name=Lexikon&file=search&eid=1&query=kilobytes">kilobytes of core memory. (1996-03-04)

In addition suitable contents:
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ref="module.php?name=Lexikon&op=content&tid=7579">mall ] [ ref="module.php?name=Lexikon&op=content&tid=7582">man ] [ ref="module.php?name=Lexikon&op=content&tid=7749">memory ] [ ref="module.php?name=Lexikon&op=content&tid=8019">mm ] [ ref="module.php?name=Lexikon&op=content&tid=8032">mo ] [ ref="module.php?name=Lexikon&op=content&tid=8040">mod ] [ ref="module.php?name=Lexikon&op=content&tid=8079">module ] [ ref="module.php?name=Lexikon&op=content&tid=8167">mp ] [ ref="module.php?name=Lexikon&op=content&tid=8384">N ] [ ref="module.php?name=Lexikon&op=content&tid=8386">na ] [ ref="module.php?name=Lexikon&op=content&tid=8459">NC ] [ ref="module.php?name=Lexikon&op=content&tid=8460">nc ] [ ref="module.php?name=Lexikon&op=content&tid=8472">ne ] [ ref="module.php?name=Lexikon&op=content&tid=8488">net ] [ ref="module.php?name=Lexikon&op=content&tid=8627">ng ] [ ref="module.php?name=Lexikon&op=content&tid=8675">no ] [ ref="module.php?name=Lexikon&op=content&tid=8708">non-volatile ] [ 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