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Core rope memory is a form of read-only Memory Wave Workshop (ROM) for computer systems. It was used in the UNIVAC I (Common Automated Laptop I) and the UNIVAC II, developed by the Eckert-Mauchly Computer Company within the 1950s, as it was a preferred know-how for program and data storage in that era. The software program for the AGC was written by programmers at the Massachusetts Institute of Technology (MIT) Instrumentation Lab, and was woven into core rope memory by female workers in factories. Some programmers nicknamed the completed product LOL memory, for Little Outdated Lady memory. Similar to magnetic-core memory, magnetic rings (or cores) are used to determine the information of the software. Unlike magnetic-core memory, the cores themselves will not be used to store the data; the best way a core is wired controls whether or not that core represents a '0' or a '1'. Set/reset: These are used to alter all of the cores from one polarity to a different.

Sense: A way wire can detect a change in a core's polarity. It could actually pass by a core to point one bit state (typically '1') or bypass it to characterize the other (sometimes '0'). Inhibit: Inhibit wires are used successfully to deal with which core to pick out. To read from core rope memory, the set/reset wire is given a powerful present to vary the polarity of the cores. This induces a small voltage on the sense wires passing via them, which might then be used to interpret binary information. The inhibit wires go a present in the other path of the set/reset wire for all cores however the specified one, acting like a memory addressing system. This prevents the sense wires from detecting polarity adjustments from the opposite magnetic cores. The sense wires are used to encode the info by both going by means of a core or bypassing it. By using many sense wires, a number of bits of information will be stored for every core.

Within the case of the Apollo Steerage Pc, each core had 192 sense wires passing by it, which could retailer twelve 16-bit phrases per core. By the requirements of the time, a relatively giant quantity of data could be stored in a small put in volume of core rope memory: Seventy two kilobytes per cubic foot, or roughly 2.5 megabytes per cubic meter. This was about 18 occasions the amount of magnetic-core memory (within two cubic toes). MIT Science Reporter. 1965. WGBH. Directed and Produced by: Duncan Copp, Nick Davidson, Christopher Riley (2008-07-07). "The Navigation Laptop". Moon Machines. Episode 3. 22:Forty minutes in. NASA/MIT film from 1965 which demonstrates how rope memory was manufactured. Visual Introduction to the Apollo Guidance Laptop, part 3: Manufacturing the Apollo Steerage Computer. Brent Hilpert's Core Rope & Woven-Wire Memory Systems page has an in depth clarification of pulse-transformer and switching-core techniques. SV3ORA's Core rope memory: A sensible guide of how to construct your personal offers a description, schematics and photographs of a simple core rope memory board using the pulse transformer approach, together with a demonstration of operation.

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