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She wrote all this code by hand to take humanity to the Moon
(thelemmy.club)
Margaret Hamilton, NASA's lead developer for Apollo program, stands next to all the code she wrote by hand that took humanity to the moon in 1969
Each punch card/ has 80 characters.
So way less than you'd imagine, but this is also late 60s machine code (even lower than assembly), and it was mathematically proven to be correct.