[TUHS] UNIX v4 Source Code Commentary - complete book now available

[Jim Capp via TUHS]

I really like the first few pages.  I look forward to a deeper dive. 

J

> On Jan 12, 2026, at 4:37 PM, Briam Rodriguez via TUHS <tuhs at tuhs.org> wrote:
> 
> Hello,
> 
> Following the incredible recovery of the UNIX v4 tape from the University
> of Utah last month, I've written a comprehensive line-by-line commentary
> on the entire UNIX Fourth Edition source code.
> 
> The book covers:
> - The kernel (boot, processes, memory management, scheduling)
> - The file system (inodes, buffer cache, namei)
> - Device drivers (TTY, RK05 disk, character devices)
> - User space (shell, utilities, C compiler, assembler)
> - Plus appendices with system call reference, file formats, and PDP-11 guide
> 
> It's open source (CC BY-NC-SA 4.0) and available on GitHub:
> 
> https://github.com/unix-v4-commentary/unix-v4-source-commentary
> 
> The PDF is included in the repo for those who just want to read.
> 
> It is my sincerest hope that this book can help someone, and I'd appreciate any feedback (and changes!).
> 
> Many thanks to Robert Ricci, and Al Kossow, and everyone involved in recovering this historic code.
> 
> Without that work, this book wouldn't have been possible. Also thanks to Mr. Warren for letting me in to the mailing list!
> 
> Please don't beat me up too bad!
> 
> Humbly yours,
> 
> Briam Rodriguez
>