Qbus split I&D?

Johnny Billquist bqt at update.uu.se
Sun Aug 9 10:55:04 CDT 2015

Noel, I just posted an answer to this riddle. I hope you got it. Let me 
know otherwise, and I'll recap it again. :-)


On 2015-03-17 00:27, Noel Chiappa wrote:
>      > From: Johnny Billquist
>      > All I can say is that I did a number of RSX SYSGENs on that 11/34, and
>      > it truly looked just like an 11/24 from a software point of view.
> The thing that I wonder about it, for that to be true, is something that
> someone (sorry, to lazy to look in the archive to give proper credit) pointed
> out, which is that that CPU is only two boards, and the memory management,
> including the PARs, is built into one of them. So how could one extend a PAR
> from 12 bits to 16, when there's already 12 bits buried deep inside the CPU?
> That's the part that I can't work out...
>      > I'm hoping that Update ... still have the documentation around.
> You and me both! :-)
> I have this dream of one day having an 11/45, with the Enable and the optional
> cache. Now that would be a sweeet machine: most of the capability of an 11/70,
> but a lot less power draw. But I'd need the documentation to see how to
> connect it up! :-)
>      > Every time this comes up I really want to go searching for manuals...
>      > :-)
> Please do! :-)
> 	Noel

Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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