14 Dec
2015
14 Dec
'15
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