Async and concurrency can be faked on a single CPU through the use of epicycles, but, epicycles cause gotchas (see Mars Pathfinder disaster, thread safety, etc.).

2 separate rPIs connected by a wire are parallel and are async. Neither one needs faked concurrency nor faked async, but we program them that way anyway.

(See, also, 2022-05-30-Fire and Forget)

Appendix - See Also

References

https://guitarvydas.github.io/2004/01/06/References.html

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