Books on writing operating systems?

Question

Books

Books on practical writing of the simplest operating systems are of interest.

Answer 1

I doubt there are. You need a theory about how hardware and operating systems work, like Tanenbaum, and books on programming the Linux kernel. The knowledge gained from them should be enough to write something of your own.

Answer 2

https://homes.cs.washington.edu/~tom/nachos/
Well, the theory that was advised above