14 Dec
2015
14 Dec
'15
8:12 a.m.
Just to change the subject..
There were "S" and an "NC" version of 11/05 high profile system.
Why?
I am curious if any DEC historians here know the reason for two versions of
the same DEC PDP 11/05 *high profile* computer (not talking about the low
profile). There are separate manuals for each type.
The S seems to be more OEM-ish because it comes in an BA11-K chassis. I am
guessing you'd see an 11/05 S as part of a larger system (PDP 10), whereas
the NC model would be for a stand alone system. ???
This S's BA11-K chassis was used by other hardware by simply changing the
backplane. The "NC" model chassis seems to be specifically for the 11/05 I
don't think it appears anywhere else.
If anyone is interested to see the different models I have a thread on my
site for each type:
11/05 S
http://vintagecomputer.net/browse_thread.cfm?id=622
11/05 NC
http://vintagecomputer.net/browse_thread.cfm?id=249
... and then there are the 11/10's....
--
Bill
14 Dec
14 Dec
10:33 a.m.
2015-12-14 17:12 GMT+01:00 william degnan <billdegnan at gmail.com>:
Just to change the subject..
There were "S" and an "NC" version of 11/05 high profile system.
Why?
I am curious if any DEC historians here know the reason for two versions of
the same DEC PDP 11/05 *high profile* computer (not talking about the low
profile). There are separate manuals for each type.
Age? The NC (and ND if you are in 230VAC area) are in the BA11-D chassis
which uses the H750 PSU. The same chassis was used by for example 11/35.
The H750 PSU has partly the same assemblies as the low PDP-11/05 chassis
and then also a H744. The memory system is somewhat different in that the
H214 is 8kW and the H217 is 16kW and the former is used in the NC/ND while
the S uses the latter.
But of course there can be all sorts of other reasons as well.
/Mattis
The S seems to be more OEM-ish because it comes in an
BA11-K chassis. I am
guessing you'd see an 11/05 S as part of a larger system (PDP 10), whereas
the NC model would be for a stand alone system. ???
This S's BA11-K chassis was used by other hardware by simply changing the
backplane. The "NC" model chassis seems to be specifically for the 11/05 I
don't think it appears anywhere else.
If anyone is interested to see the different models I have a thread on my
site for each type:
11/05 S
http://vintagecomputer.net/browse_thread.cfm?id=622
11/05 NC
http://vintagecomputer.net/browse_thread.cfm?id=249
... and then there are the 11/10's....
--
Bill
6:15 p.m.
On Mon, Dec 14, 2015 at 1:33 PM, Mattis Lind <mattislind at gmail.com> wrote:
2015-12-14 17:12 GMT+01:00 william degnan
<billdegnan at gmail.com>:
Yes I did know that power supplies and RAM are different within the two
versions, being that have both types of 11/05. That's what prompted my
question - *why* did they make these two versions of the high-profile
11/05? What was one used for vs. the other? *Why did DEC do this*?
It is simply that as long as the box had the M7260/M7261 CPU cards it was
an "11/05"? (or 11/10)
Those of you who knew DEC back then may have a perspective I don't on the
subject. Seems to me that they did not care, they just used what they had
available.
--
Bill
Just to change the subject..
There were "S" and an "NC" version of 11/05 high profile system.
Why?
I am curious if any DEC historians here know the reason for two versions
of
the same DEC PDP 11/05 *high profile* computer
(not talking about the low
profile). There are separate manuals for each type.
Age? The NC (and ND if you are in 230VAC area) are in the BA11-D chassis
which uses the H750 PSU. The same chassis was used by for example 11/35.
The H750 PSU has partly the same assemblies as the low PDP-11/05 chassis
and then also a H744. The memory system is somewhat different in that the
H214 is 8kW and the H217 is 16kW and the former is used in the NC/ND while
the S uses the latter.
But of course there can be all sorts of other reasons as well.
/Mattis
9:44 p.m.
2015-12-15 3:15 GMT+01:00 william degnan <billdegnan at gmail.com>:
On Mon, Dec 14, 2015 at 1:33 PM, Mattis Lind
<mattislind at gmail.com> wrote:
while
Yes, and my guess that they are of different vintage. The BA11-D is the
older box used for the NC and the BA11-K is the more modern box used for
the S model. Over the years the memory requirements increased and thus they
had to increase the density.
I think the NC/ND models are the first 11/05s along with the low cabinet
model. The a few years later the S model was added.
/Mattis
2015-12-14 17:12 GMT+01:00 william degnan
<billdegnan at gmail.com>:
> Just to change the subject..
>
> There were "S" and an "NC" version of 11/05 high profile system.
Why?
>
> I am curious if any DEC historians here know the reason for two
versions
of
> the same DEC PDP 11/05 *high profile* computer (not talking about the
low
profile).
There are separate manuals for each type.
Age? The NC (and ND if you are in 230VAC area) are in the BA11-D chassis
which uses the H750 PSU. The same chassis was used by for example 11/35.
The H750 PSU has partly the same assemblies as the low PDP-11/05 chassis
and then also a H744. The memory system is somewhat different in that the
H214 is 8kW and the H217 is 16kW and the former is used in the NC/ND the S uses the latter.
But of course there can be all sorts of other reasons as well.
/Mattis
Yes I did know that power supplies and RAM are different within the two
versions, being that have both types of 11/05. That's what prompted my
question - *why* did they make these two versions of the high-profile
11/05? What was one used for vs. the other? *Why did DEC do this*?
It is simply that as long as the box had the M7260/M7261 CPU cards it was
an "11/05"? (or 11/10)
Those of you who knew DEC back then may have a perspective I don't on the
subject. Seems to me that they did not care, they just used what they had
available.
--
Bill
15 Dec
15 Dec
5:48 a.m.
Yes, and my guess that they are of different vintage. The BA11-D is the
older box used for the NC and the BA11-K is the more modern box used for
the S model. Over the years the memory requirements increased and thus they
had to increase the density.
I think the NC/ND models are the first 11/05s along with the low cabinet
model. The a few years later the S model was added.
/Mattis
OK. My instinct was to suspect this, but I was unsure because I started
with a bare BA11-K and empty H765, and then located the cards and brick
regulators described in the DEC docs to determine and pick correct parts to
complete the system.
I have been using the 11/05 S in the BA11-K as a "bench" UNIBUS system for
testing UNIBUS cards, I don't intend to rack this one up. I don't even
have a front panel bracket or cover. The front panel is attached with two
screws laced through the rack mount holes and into the screw opening of the
two top front panel holes. Works well enough for testing purposes. I
loaded BASIC into core as if it were an 8K system and left the top 8K open
for other things.
My NC model has just the 8K.
Bill
3294
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