You are unlikely to encounter Oberon in the wild, but this book is the clearest and most elegant exposition of a systems design I have seen. They walk through the code for a complete operating system from hardware drivers to file system, compiler, graphic user interface and everything else in less than 10,000 lines of code. The focus on modularity and minimalism is very refreshing.
I have the orginal hardbound 1992 edition [0], but it looks like there is a 2013 revision available as a collection of pdfs [1]
[0] https://www.amazon.com/Project-Oberon-Design-Operating-Compi... [1] https://inf.ethz.ch/personal/wirth/ProjectOberon/index.html
You are unlikely to encounter Oberon in the wild, but this book is the clearest and most elegant exposition of a systems design I have seen. They walk through the code for a complete operating system from hardware drivers to file system, compiler, graphic user interface and everything else in less than 10,000 lines of code. The focus on modularity and minimalism is very refreshing.