There are three Qbus uVAX cpus KA630(uV-II),
KA650(3600) and
KA655(3900), they must have the corresponding memory [...]
There's also the KA620, which is the same as the KA630 as far as memory
interfaces go. However, it won't run VMS (indeed, that's sort of the
point of it).
Back in the day, the KA620 was hard to find. I daresay these days it's
even harder to find, though whether that's just because all MicroVAX
hardware has gotten rarer or not I'm not competent to say.
Fortunately, there's little reason to want one unless you're a
completist...or have some OS software that expects a KA620 but can't
tolerate a KA630 (I don't know of any such software, but it may exist.)
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