cctech digest, Vol 1 #370 - 5 msgs

From: Michael Robinson <>
Date: Fri Feb 14 12:52:00 2003

> > Could someone scan the engineering drawings for an H217C stack?
> Go to or
> one or both will have drawings for
> the 11/05.

Hmm, we do have the drawings for the 11/05. However, neither of the above
sites seem to have drawings of the H217C.

> > This is partly for my own edification (I have one such board in my
> > machine), and partly because of the fact that this "new" pdp-11/05 has no
> > core with it. Its engineering drawings seem to indicate that it wants
> > 4 or 8kW of core (one or more of H213-H216), *not* the 16kW of a H217.
> > (Granted, by placing two H214s into a chassis we get 16kW, but I
> > digress.)
> It will depend upon which backplane you have. If it's an 11/05-S
> backplane then it's the same as what I have and you can go to
> to see how to use an
> H217C (which is what I have in mine).

I'm fairly sure it's not an 11/05-S, though I could obviously be wrong. I
don't have the machine in front of me right now. Looking at the machine
you have, the form-factor is very different (that, of course is not
conclusive). This machine looks like a lower-profile beast, the modules
enter from the side of the chassis, which is a pain because you have to
take the machine out of the rack to get at them.

> > If so, the next question is, can I do this with an H217? (Drop in an
> > H217C, and tell the machine that it's really an H214/H215.) This might
> > sound like a gratuitous waste of core, which it is, but I happen to have
> > another core board (not in my machine) that could be used... So anyway,
> > the engineering drawings would answer this question really fast.
> >
> It's not so much the drawings but the wirelist for the backplane. You
> really need to know which backplane you have.

I have that. Again, my question is what does the H217 look like in
comparison to the H213-H216 family? Pretty much the only piece of data I
need to answer my question is the engineering drawings of the H217...

Guy: BTW, the proud owner of this machine is Jesse Kempf, whom I believe
you have talked with. He's not on classiccmp, though.

Michael Robinson
RPI Electronics Club Vaxherd/PDP-11 Fixer
Received on Fri Feb 14 2003 - 12:52:00 GMT

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