The first version of the Shuttle flight software had two serious problems: it couldn’t fit in the computer, and it ran way too slow. IBM was two years into the contract and basically nothing worked. All hell broke loose.
By comparison to the Space Shuttle, Apollo was a Model-T Ford – no set of computer-controlled spaceship operations like this had ever been attempted. Nothing that got us to the Moon could be reused here, and so it was discarded.
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