- There is a processor that executes some subset of the VAX
instruction set. There is some additional hardware as
specified by the VAX Architecture Reference Manual.
I don't think "the VAX Architecture Reference Manual" is a single
thing. If so, the rtVAX 300 isn't a VAX, because the VARM I have
specifies MTPR/MFPR console access. Neither is the KA-630, because the
VARM I have specifies PDP-11 compatability mode, which the KA-630
doesn't have as far as I can recall. (My VARM is rev 6.1, of
1982-05-20, according to the cover.)