PASIEKA / SCIENCE PHOTO LIBRARY PASIEKA / SCIENCE PHOTO LIBRARY
Magnetic-core memory board of a Univac computer. It uses tiny magnetic toroids (rings), the cores, through which wires are threaded to write and read information. This technique was in use for about 20 years between 1955 and 1975. Then integrated-circuit RAM (random access memory) came on the market and are now the most common type of memory found in personal computers and other electronic devices such as cellular phones, USB sticks and printers.
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