Forum about retrocomputing, found via a link on Norbert Landsteiner's site https://masswerk.at/lounge.php
https://retrocomputingforum.com/t/some-materials-on-early-c-and-the-history-of-c/3016 looks interesting.

Found via a link on https://statespace.dev/tops-10.html

Links to documents describing transputers and the Helios operating system, which has a GPL v3 licensed NG variant, https://github.com/axelmuhr/Helios-NG which appears to be dormant.

Mentioned on the TUHS mailing list https://www.tuhs.org/pipermail/tuhs/2024-September/030872.html
Some interesting documents are
There Is No Royal Road to Programs - A Trilogy on Raster Ellipses and Programming Methodology (M. Douglas McIlroy)
MM 67-4734-7 1967-05-15 2.54 MB An Introduction to the Available Programs and Other Design Aids for the Design of Filters, Equalizers and Other Networks
MM 67-5311-18 1967-08-29 1.27 MB Notes on the Design of Cosine Roll-Off Filters

A few days later, Chet Ramey posted https://www.tuhs.org/pipermail/tuhs/2024-October/030946.html the link https://www.telecomarchive.com/bstj.html where the Bell System Technical Journal from 1922 to 1996

"Welcome to TekWiki, a wiki for the community of Tektronix oscilloscope enthusiasts." Includes pages about Keithley instruments.
Found via a post on the TUHS mailing list https://www.tuhs.org/pipermail/tuhs/2024-September/030738.html

Work in progress, mentioned on https://groups.google.com/g/pidp-10/c/YWoDDGWPt58/m/a8gOknBFAQAJ

Appears to be an interesting read.

Found via a link on MoHP https://www.hpmuseum.org/forum/thread-22071-post-189526.html#pid189526
The number of transistors is smaller than I had expected, it will be interesting to compare it with the values for Mailüfterl.

Found a link to the floppy disc head alignment on the MoHP https://www.hpmuseum.org/forum/thread-22003-post-189057.html#pid189057

Links to stories about the TENEX and TOPS-20 operating systems