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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
I was a CS major in late 70s and used punch cards for Fortran programs. I’m guessing “by hand” meant writing the code with pencil/pen on paper and then typing up the punch cards for each line of code.