Programmer friend years ago broke it down for me like this. Yes, he did it in assembly, but similar to all computer things; he used large chunks of copy pasta. In no way does it diminish the achievement. But for layman, hearing that it was all written in machine code conjured images of vacuum tubes and Margaret Hamilton standing next to a literal person sized stack of typed pages. He moved mountains efficiently and intelligently with clever acumen. A real feat!
Now if you will excuse me, a handyman is drowning.
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