Douglas Comer 写的《Operating System Design: Internet Working With Xinu》（1987）解释得很棒，里面有大量的 C 代码展示如何给操作系统添加网络协议栈，书里用的就是他那个受 Unix 启发、用于教学的 XINU。
Operating System Design: Internet Working With Xinu by Douglas Comer (1987) is a nice explanation with lots of C code of how to add a networking stack to an operating system, in this case his educational unix-inspired XINU.
很多年前我根据 Douglas Comer 的《Operating System Design》写过一个玩具 OS。我个人对不能在真机上跑的东西实在提不起劲，所以我把自己的移植到了 Raspberry Pi 上。有什么它能跑的真机硬件吗？正在找……
I started a toy OS years ago based on the book Operating System Design by Douglas Comer. Personally I just couldn't get excited about anything that didn't run on real hardware, so I made mine for Raspberry Pi. Is there any real hardware that this could run on? Looking…
Douglas Comer 写的《Operating System Design: Internet Working With Xinu》（1987）解释得很棒，里面有大量的 C 代码展示如何给操作系统添加网络协议栈，书里用的就是他那个受 Unix 启发、用于教学的 XINU。
Operating System Design: Internet Working With Xinu by Douglas Comer (1987) is a nice explanation with lots of C code of how to add a networking stack to an operating system, in this case his educational unix-inspired XINU.
很多年前我根据 Douglas Comer 的《Operating System Design》写过一个玩具 OS。我个人对不能在真机上跑的东西实在提不起劲，所以我把自己的移植到了 Raspberry Pi 上。有什么它能跑的真机硬件吗？正在找……
I started a toy OS years ago based on the book Operating System Design by Douglas Comer. Personally I just couldn't get excited about anything that didn't run on real hardware, so I made mine for Raspberry Pi. Is there any real hardware that this could run on? Looking…