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Encyclopedia > Drum memory

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Drum memory - Wikipedia, the free encyclopedia (401 words)
Drum memory was an early form of computer memory that was widely used in the 1950s and into the 1960s.
Drums were later replaced by core memory, which was faster and had no moving parts, and which lasted until semiconductor memory entered the scene.
A drum is a large metal cylinder that is coated on the outside surface with a ferromagnetic recording material.
Random access memory - Wikipedia, the free encyclopedia (1009 words)
This is in contrast to sequential memory devices such as magnetic tapes, discs and drums, in which the mechanical movement of the storage medium forces the computer to access data in a fixed order.
One defining characteristic of RAM is that its accesses to different memory locations are almost always completed at about the same speed, in contrast to some other technologies that required a certain delay time for a bit or byte to “come around”.
Core memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “core” is still used by some programmers to describe the RAM at the heart of a computer).
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