The Apollo Guidance Computer had its programs woven into copper wire by hand. Margaret Hamilton led the team that wrote the flight software.
Cipher · Wednesday 11 November 2026
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Rope memory for the Moon
Ten puzzles on the Apollo Guidance Computer, from a pigpen opener to an autokey closer, with a find-a-word. Answers at the foot.
The Apollo Guidance Computer stored its programs in core rope memory woven by hand. Photo: NASA / Wikimedia Commons, public domain, cropped and resized.
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