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Drum memory
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Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria. Drums were widely used in the 1950s and into the 1960s as computer memory.
Drum memory of a Polish ZAM-41 [pl] computer
Drum memory of a Polish ZAM-41 [pl] computer
Drum memory from the BESK computer, Sweden's first binary computer, which made its debut in 1953
Drum memory from the BESK computer, Sweden's first binary computer, which made its debut in 1953
Drum memory made around 1972 in the Soviet Union
Drum memory made around 1972 in the Soviet Union
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.
Drum memory
…various IBM drum storage drives, and the UNIVAC Flying head and FASTRAND series of drums. Drums were displaced as primary computer memory by magnetic core memory, which offered a better balance of size, speed, cost, reliability and potential for further improvements. Drums were then replaced by hard disk drives…
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
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
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 v
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
One of three inter-connected modules that make up an Omnibus-based (PDP 8/e/f/m) PDP-8 core memory plane