14 Feb
2003
14 Feb
'03
5:08 a.m.
On Fri, 2003-02-14 at 10:50, Michael Robinson wrote:
Hmm, we do have the drawings for the 11/05. However, neither of the above
sites seem to have drawings of the H217C.
Look for MM11-U(P). The option (with backplane) is MF11-U(P). It'll
cover the G235, G114, H217 and the M8293. The other one I believe is
MM11-L which uses the smaller core.
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.
You can't tell by how it's oriented. It's the backplane. If you look
there should be a tag indicating the type of backplane it is. You
should see 11/05-S. If you can't find that, atleast get the part #. We
can probably cross reference off that.
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.
Yes. I talked to him yesterday. He's pretty stoked.
Could someone scan the engineering drawings for an
H217C stack?
Go to http://www.spies.com/~aek/pdf/dec or
http://www.maincoon.com/classiccmp one or both will have drawings for
the 11/05. 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
http://www.shiresoft.com/pdp-11/11-10/index.html to see how to use an
H217C (which is what I have in mine). 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.
Thanks,
Michael Robinson
RPI Electronics Club Vaxherd/PDP-11 Fixer
robinm(a)rpi.edu
--
TTFN - Guy