[TUHS] A PDP-10 used for UNIX just after the PDP-7?

[segaloco via TUHS]

On Friday, January 16th, 2026 at 10:00, Noel Chiappa via TUHS tuhs at tuhs.org wrote:

> There was also support for the KS11 in UNIX V2, from which it would be easier
> to produce a programming manual for the thing. Alas, that version of UNIX has
> been lost (although a bit about how the KS11 worked can be deduced from the
> V2 manual, which is extant).
> 
> Noel

I presume everything would be in the kernel that touches hardware memory management stuff?  Reason I ask is there is plenty of documented EAE use in V2 userland stuff:

https://gitlab.com/segaloco/v2src

For those who haven't perused it, thats my slow-burn restoration of the V2 userland from Dennis Ritchie's "s2-bits" tape.  EAE use dates it to the PDP-11/20 system and presence of no, V1, and V2 a.out magic numbers puts them at V2.  By comparison, the V2 "cmd" path on the UNIX tree (s1-bits recovery) is later versions, probably V3, as they are still assembler but any EAE usage has been replaced with PDP-11/45 arithmetic operations.

If there is any compelling thought on whether any V2 userland code would *know* about this memory subsystem, I'm happy to go disassembling and looking around for clues.  We don't know of any other V2/V3 artifacts beyond manuals and s1/s2 bits tapes do we?

- Matt G.