Interesting reference to the The Harvard/Radcliffe Student Time-sharing System Terminal Users Guide,
1st edition, September 10, 1974, Center for Research in Computing Technology, Harvard University
On 2023-07-12, the original URL https://minnie.tuhs.org/pipermail/tuhs/2022-September/026512.html is not working, replacing minnie by www corrects that.

ssh unix50 at unix50.org

AC Frequency Monitor
Panda display panel for a simulated pdp-10 http://sparetimegizmos.com/Hardware/Panda.htm found on http://panda.trailing-edge.com/

Found via https://www.hpmuseum.org/forum/thread-17957-post-156688.html#pid156688

Found via the TUHS mailing list https://minnie.tuhs.org/pipermail/tuhs/2021-December/024902.html
This post describes his org-mode setup, but other entries about his work on various emulators are interesting too.

Article from Tom Duff, August 1987
Executable files in the Ninth Edition of the UNIX system contain small amounts of unused space, allowing small code sequences to be added to them without noticeably affecting their functionality. A program fragment that looks for binaries and introduces copies of itself into their slack space will transitively spread like a virus. Such a virus program could, like the Trojan Horse, harbor Greeks set to attack the system when run by sufficiently privileged users or from infected set-userid programs.

License is vague:
MINCE (version 2.5, 2.6, and 2.63), DIFF (version 1.1), Scribble (version 1.3), Pencil (version 1.3), and Crayon (version 1.3), along with any associated documentation (the "Materials"), are Copyright © 1980—1985 by Mark of the Unicorn, Inc.

These Materials are provided in accordance with Title 17 U.S.C. Section 107, and distributed without profit, in original and unmodified form, for non-commercial research and educational purposes, for use by those who have expressed a prior general interest in receiving the Materials.

The Portable MINCE authors claim no affiliation, endorsement, or sponsorship whatsoever by the originators of the Materials.

If you wish to use these copyrighted Materials for any purposes beyond "fair use", you MUST locate and obtain permission from the current copyright owner.

Detailed description of the stack layout, use of R5 as frame pointer by the (V6) Unix C compiler on the pdp-11.

See also https://github.com/timnewsham/myv6

A version of a Unix 5th (and 6th) Edition filesystem for Linux. It is read only, and was written for Linux 2.0 on an x86 and so will require a little work to install on other systems and newer kernels, but it is fun to be able to mount old disk images.