2.11BSD is still getting patches[1] - mostly due to renewed interest from the PiDP-11 project[2]. Recent changes[3] include the addition of the 'top' utility.
Reverting to patch level zero is an interesting exercise but there are still plenty of people who are interested in maintaining and updating the operating system.
Edit: And I understand the pain - the "patches" are a eclectic mix of straight diff output, shell archives, uuencoded compressed tar files, and all sorts of manual steps. But the patch "readme" information is unusually verbose and the update instructions are well written and informative.
Reverting to patch level zero is an interesting exercise but there are still plenty of people who are interested in maintaining and updating the operating system.
Edit: And I understand the pain - the "patches" are a eclectic mix of straight diff output, shell archives, uuencoded compressed tar files, and all sorts of manual steps. But the patch "readme" information is unusually verbose and the update instructions are well written and informative.
[1] https://www.tuhs.org/Archive/Distributions/UCB/2.11BSD/Patch...
[2] https://obsolescence.wixsite.com/obsolescence/pidp-11
[3] https://github.com/chasecovello/211bsd-pidp11