The Apollo 11 Code Is Open Source (and it's hilarious) [video]
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Michael Steil also has a great tech talk about the Lunar module flight controller, from the interface to its internals.
Search for "Ultimate talk", you will find similar talks about C64, and many other computers.
> In 1963 the Apollo program was buying 60% of all the microchips made in the US
Daaaang.