Not sure if this is useful for hardware, but there's UF [0] for Uxn [1], a tiny VM that can you can get to run on lots and lots of (old and new) devices. [0]:

Not sure if this is useful for hardware, but there's UF [0] for Uxn [1], a tiny VM that can you can get to run on lots and lots of (old and new) devices. [0]: http://www.call-with-current-continuation.org/uf/README http://www.call-with-current-continuation.org/uf/README (git repo link at the bottom of that page) [1]: https://100r.co/site/uxn.html https://100r.co/site/uxn.html