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Lexikon


ferrite core memory


e> (Or "core") An early form of ef="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 ef="module.php?name=Lexikon&file=search&eid=1&query=bit">bit of data. These were sandwiched between ef="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 ef="module.php?name=Lexikon&file=search&eid=1&query=semiconductor">semiconductor memory. For example, the 1970s-era ef="module.php?name=Lexikon&file=search&eid=1&query=NCR 499">NCR 499 had two boards, each with 16 ef="module.php?name=Lexikon&file=search&eid=1&query=kilobytes">kilobytes of core memory. (1996-03-04)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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