Carlos Murillo wrote:
Didn't the uVax II implement some of the original VAX instructions
with emulation?
Yes, as did the MicroVAX I. But IIRC it was with the
MicroVAX II that the architecture was formally
subsetted.
I always wondered what the VUP
rating would
have
been were they not emulated.
Hopefully about the same, othewise they did
a poor job of selecting instructions to subset!
The instructions that they did not implement
were those that were infrequently used and
cost too much chip real-estate.
Antonio
arcarlini(a)iee.org