I dug up the 1991 UCB source to vcat from UUNET archives I have and Rob's
note about the 1983 Regents copyright.
I'll keep digging - BTW there is no assembler in this version.

Finding a copy of the original 't' for Toronto directory from the 1977
Harvard USENIX tape would be helpful. I spoke with Henry Spencer yesterday,
like me - Henry has the '79 Toronto USENIX tape (which is what is the TUHS
archives). I'll try to track down Tom Ferrin, Tom Duff, Bill and Mike
later.
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On Fri, Mar 10, 2023 at 2:50 AM Jonathan Gray <jsg@jsg.id.au> wrote:

> On Fri, Mar 10, 2023 at 07:48:26AM +1100, Rob Pike wrote:
> >
> > Years later, bless him, Henry Spencer said something on Usenet explaining
> > why the "Berkeley typesetting software" was missing the names of those
> who
> > created it. He was in the lab that weekend and saw it happen.
> >
> > -rob
>
> https://groups.google.com/g/net.unix-wizards/c/eZ1qIlRyhx0/m/UmE8cBRYbPEJ
> Henry Spencer in net.unix-wizards Dec 17, 1983
>
> "The proper credits for vcat are roughly as follows:
>
> Bill Reeves most of vcat, and the font editor
> Tom Duff the inner loop of vcat, in pdp11 assembler
> Rob Pike the (unreleased) precursor to vcat (called vd)
> Mike Tilson miscellaneous optimizations
>
> The distributed source for vcat had Reeves, Pike, Tilson in the heading,
> and Duff in the lone .s file. My thanks to Rob Pike for refreshing my
> memory on this."
>