V source code
exists, right? It seems likely W would have been
written in the same language as [V]. And that early X would also be
the same. Another source of information would be to ask Bob
Scheifler and Jim Gettys.
Whilst that is a reasonable assumption, I’m not sure it is true in
this case. Bob Scheifler writes in 1986:
"We acquired a UNIX-based version of W for the [VS1OO] (with
synchronous communication over TCP [24] produced by Asente and Chris
Kent at Digital’s Western Research Laboratory.”
It does not say “C based”, but it is quite possible that the Unix port
also meant moving to C.