There's XINU (Xinu's Not Unix). There's a book that walks you through the complete implementation of the OS in C [1]. [1] https://xinu.cs.purdue.edu/ https://x

There's XINU (Xinu's Not Unix). There's a book that walks you through the complete implementation of the OS in C [1]. [1] https://xinu.cs.purdue.edu/ https://xinu.cs.purdue.edu/