Software woven into wire: Core rope and the Apollo Guidance Computer

Onboard the Apollo spacecraft, the revolutionary Apollo Guidance Computer helped navigate to the Moon and land on its surface. One of the first computers to use integrated circuits, the Apollo Guidance Computer was lightweight enough and small enough (70 pounds and under a cubic foot) to fly in space. An unusual feature that contributed to its small size was core rope memory, a technique of physically weaving software into high-density storage. In this blog post, I take a close look at core rope...

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