Please correct me if I'm wrong, but it was my
understanding that
(part of?) the VAX instruction set was prototyped using the 11/60 as
well.
I believe that there were hardware test rigs in use before
the first VAX protos arrived. I believe that I've read that
they were based on a modified PDP-11 but I don't recall
where I read that. Time to go peruse the early DTJs again
I suppose.
Antonio
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Antonio Carlini arcarlini(a)iee.org