XINU stands for Xinu Is Not Unix — although it shares concepts and even names with Unix, the internal design differs completely. Xinu is a small, elegant operating system that supports dynamic process creation, dynamic memory allocation, network communication, local and remote file systems, a shell, and device-independent I/O functions. The small size makes Xinu suitable for embedded environments.
‘Xinu is not Unix’
2015-11-29 OS News 6 Comments
The website looks content-free to me, apart from the small vague blurb quoted here.
I’d prefer not to have to buy a textbook, or download executable code, to have a sense of what’s in Xinu.