A few years ago I corresponded with DMR about precisely this project.
He mentioned having those listings; we pondered whether it would be
practical to get them machine-readable and try to get them loaded and
booting on one of my pdp-15s to recreate an operational 18-bit Unix...
but ultimately decided it was impractical at the time.
And from 2007...
"Post by Dennis Ritchie
Was there a PDP-9 [Unix] port? Mr. Ritchie, sir?
Yes, Ken moved the -7 system to both the PDP-9 and PDP-15
just to try them out. Minimal effort, just some new drivers, no
effort to take advantage of extra features on either. Total time
they actually ran was probably measured in hours or a few
days at most. One of the machines ran a step-and-repeat
camera for making IC masks.
And all that software is presumably long gone along with the PDP-7 version.
Glad he was wrong. Nice to see those listings have survived and surfaced. Maybe one day I WILL get them running on my pdp-15 :)