Woven, Not Written: The Hand-Threaded Computer That Landed Apollo 11 — and the Bug That Nearly Stopped It
Tech History — Saturday, September 19, 2026 Woven, Not Written: The Hand-Threaded Computer That Landed Apollo 11 — and the Bug That Nearly Stopped It Software you could hold in your hands, an operating system sketched in the early 1960s, and 13 percent of a duty cycle that went missing over the Sea of Tranquility. GB GadgetGlow Bytes Editorial Published September 19, 2026 · 8 min read · How we work Three minutes from the lunar surface, the computer flying the Lunar Module gave up on part of its own workload and told the crew about it. A five-digit code appeared on the display panel: 1202 . Neil Armstrong's voice, when it came, had an edge on it. "Give us a reading on the 1202 program alarm." What happened over the next four minutes is usually compressed into a single sentence — the software was clever enough to save the landing — and that sentence, while not wrong, skips the part worth understanding. The machine did not diagnose anyt...