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Core rope memory
Contrary to ordinary magnetic core memory, which was used for RAM at the time, all the ferrite cores in a core rope are permanently magnetized in one direction. The signal from a wire passing through a given core is interpreted as a binary "one" while a wire that bypasses the core is read as a "zero". In the AGC, up to 64 wires could be passed through a single core. A relatively large amount of data could be stored in a small volume; the capacity of one cubic foot of it was 36,864 sixteen bit words (compared to only 2048 sixteen bit words of standard read-write core memory in a similar volume).
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