Faking concurrency
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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