Core rope memory
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Core rope memory is a form of read-only memory for computers. It was used in the UNIVAC I and the UNIVAC II, developed by the Eckert-Mauchly Computer Corporation in the 1950s, as it was a popular tech
Rope memory from the Apollo Guidance Computer
Photo detail of a 16Kb rope core memory board from a 1974 computer
Core rope memory test sample from the Apollo program
Magnetic-core memory
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In computing, magnetic-core memory is a form of random-access memory. It predominated for roughly 20 years between 1955 and 1975, and is often just called core memory, or, informally, core.
Core rope memory
…small installed volume of core rope memory: 72 kilobytes per cubic foot, or roughly 2.5 megabytes per cubic meter. This was about 18 times the amount of magnetic-core memory (within two cubic feet). "Computer for Apollo" NASA/MIT film from 1965 which demonstrates how rope memory was manufactured…
A 32 × 32 core memory plane storing 1024 bits (or 128 bytes) of data. The small black rings at the intersections of the grid wires, organised in four squares, are the ferrite cores.
Project Whirlwind core memory
Close-up of a core plane. The distance between the rings is roughly 1 mm (0.04 in). The green horizontal wires are X; the Y wires are dull brown and vertical, toward the back. The sense wires are diagonal, colored orange, and the inhibit wires are vertical twisted pairs.
One of three inter-connected modules that make up an Omnibus-based (PDP 8/e/f/m) PDP-8 core memory plane