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I got some details wrong, but it's basically right.

Dijkstra spoke to Joel Aron (not Eyles), "head of IBM's Federal Systems Division which had been responsible for the software of the moonshot". It wasn't specifically in the lunar module, but somewhere in the 40,000 LoC. However, the bug was that the moon was repelling; and it was found by accident, 5 days before launch.

See Dijkstra say it in person, at 15:00 in this interview (context starts at 13:40): http://www.cs.utexas.edu/users/EWD/video.html (I haven't linked directly to the 300MB download). Great interview BTW (dutch with subtitles).




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