Knight Hilltop Chateau

Knight Hilltop ChateauKnight Spring Blossoms along a Meandering RiverKnight Two Girls by a StreamKnight View Of A Chateaux
a core memory, ferromagnetic rings just a few millimetres across are threaded onto wires running vertically, horizontally and diagonally to form a large mesh. The horizontal and vertical wires are called X and Y respectively, and are used wires are called 'sense wires'. A current representing the present state of individual bits is induced in these sense wires when the X and Y wires are active.
Magnetising requires a certain amount of electricity, and by supplying only half that power to a single pair of X and Y wires, those surrounding the bit to be read remain unchanged. The problem is that the core being addressed is also overwritten when its bit is read. After reading the bit's value in such a system, it must be restored by a refresh circuit that repeats the addressing procedure and returns the core to its original magnetic state.
Despite this complicated method of storing and retrieving