On Fri, 24 Dec 2021 at 13:33, Grant Taylor via TUHS <tuhs@minnie.tuhs.org> wrote:

I'm following suit for 4.4BSD as I've got The Design and Implementation
of the 4.4BSD Operating System book (ISBN: 0-201-54979-4) on my desk.

Sadly it seems as if 4.4BSD-Encumbered would be required to run it on a
VAX emulator and 4.4BSD-Lite is apparently non-starter.

4.4's /usr/src/sys/vax/README:

The VAX architecture does not compile in 4.4BSD, as it has
not been converted to the new VM.  It is here for porting
information purposes only.

The best you can do as-is on a VAX is 4.3-Reno.