The "Linux on an 8 bit micro" experiment came to mind for me: https://dmitry.gr/?r=05.Projects&proj=07.%20Linux%20on%208bit https://dmitry.gr/?r=05.Projects&pr

The "Linux on an 8 bit micro" experiment came to mind for me: https://dmitry.gr/?r=05.Projects&proj=07.%20Linux%20on%208bit https://dmitry.gr/?r=05.Projects&proj=07.%20Linux%20on%208bi... 2 hours to boot to a shell :)