bit addressing, alignment, bus errors, and VM (was Re: PDP-10 arch question)

From: Jerome Fine <jhfine_at_idirect.com>
Date: Sat Oct 31 07:31:53 1998

>William Donzelli wrote:

> > One other interesting aspect is that by convention, the OS assumed
> > that all of the top half of virtual memory belonged to the OS. Another
> > is that the hardware was the child of Seymore Cray.
> Are you certain of that? Cray designed the CDC 160, and had a hand in the
> CDC 6000s, but I do not think the STAR.

Jerome Fine replies:

After more than 25 years, I am not certain of anything. But if Cray had a
hand in the CDC 6000s, and he was still around CDC at the time the
STAR 100 was designed and built, I would certainly think that he was
also involved in the STAR 100 as well. I thought I saw an article about
the STAR 100 recently which described the circular nature of the physical
rack which was required in order to reduce to length of the wires which
interconnected the different parts of the system. Evidently, it was rather
cold in the centre of the whole thing.

Sincerely yours,

Jerome Fine
Received on Sat Oct 31 1998 - 07:31:53 GMT