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I know the space shuttle employed multiple redundant computers of differing hardware as failsafes. I can't imagine SpaceX didn't do the same thing.

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The redundant computers were only one part of it. The Space Shuttle software engineering capability was on another level.

https://www.fastcompany.com/28121/they-write-right-stuff

For redundancy, the Space Shuttle used five of the same computer (IBM AP-101). Four of them ran the same software, while the fifth ran independently-developed software in case a bug prevented the others from working.

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