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UNIX Fourth Edition

114 points by dcminter

by aap_

1 subcomments

Hi, this is me. I'm still hacking on it but ran into some hard to understand kernel bugs. once i mount more than the root filesystem (say /usr/man) there are issues with inode allocation/freeing. mixing and matching v4 and v5 stuff in various ways can also lead to other interesting bugs but often an allocated inode ends up on the freelist, and things break.
Otoh it's so much fun to hack and fiddle with the unix kernel :) very zen

by lproven

0 subcomment

Just for what it's worth, I tried to explain the context and the historical importance when I wrote about the original discovery of the tape, and about the recovery:
https://www.theregister.com/2025/11/07/unix_fourth_edition_t...
https://www.theregister.com/2025/12/23/unix_v4_tape_successf...

by dcminter

0 subcomment

This is the result of the tape from 1973 found at the University of Utah being sent over to the Computer History Museum for retrieval by bitsavers.org
Prior discussion: https://news.ycombinator.com/item?id=45840321

by 1vuio0pswjnm7

0 subcomment

"There's a video of the recovery here. It's only slightly over five minutes long, but then, UNIX V4 wasn't very big yet: for instance, the kernel was some 27 kB of code."
"It's very small: it contains around 55,000 lines of code, of which about 25,000 lines are in C, with under 1,000 lines of comments."
Yesterday, HN front page:
https://fzakaria.com/2025/12/28/huge-binaries
"Responses to my publication submissions often claimed such problems did not exist; however, I had observed them during my time within industry, such as at Google, but I couldn't cite it!
One problem that is only present at these mega-codebases is massive binaries. What's the largest binary (ELF file) you've ever seen? I had observed binaries beyond 25GiB, including debug symbols."
It's funny that he could not publish about the laughably large binary sizes at Google
Meanwhile employees at the company have often published papers portraying the company's problems as interesting, perhaps as a recruiting technique

by userbinator

0 subcomment

It still amazes me that even with all this functionality, it runs on a system with only 64k of RAM.

by zatkin

1 subcomments

Has anyone managed to extract out the C source files and upload them into some browsable UI, e.g. GitHub or GitLab?

by rasyidi

1 subcomments

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