Warner Losh writes:
> Arthur Krewat wrote:
>> Was there ever a UNIX or even the thought of porting one
>> to a PDP-10?
> IIRC, there was a NetBSD/pdp10. Don't know how far it got.

Not far enough.  I was a little bit involved when there was talk of
using GCC.

> The instructor of my first C course in college wrote a very
> good C compiler for TOPS-10/TOPS-20.

Which one?

I have found remnants of a compiler called C10 by Alan Snyder.  I have
tried to reach him without result.