26 Feb
2016
26 Feb
'16
7:05 a.m.
2016-02-26 15:04 GMT+01:00 Noel Chiappa <jnc at mercury.lcs.mit.edu>:
Min doesn't say NC / ND either.
http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-05
I have a physical tech manual (which is not the same as the one at
bitsavers) and engineering drawings (which is the same as the one at
bitsavers
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp11/1105/1105_RevAH_…
)
I should probably scan that tech manual if someone hasn't done it already.
Compared to the one at bitsavers it for example include an appendix
related to some minor modifications that had been done to the CPU board
set.
It is the latter with space for the M9970, DF11 and KM11 instead of an SPC.
The bitsavers document above has the backplane on page 19.
/Mattis
From: Mattis
Lind
The NC is in the BA11-D 10 1/2 inch box. It uses
the H750 PSU.
Odd. I have an -11/10 in a 10-1/2 box with an H750; the metal plate on the
back of the box just says "PDP 11-10" (well, the '-' is actually a dot,
at
the level of the '-'). No 'NC'. I wonder if that's a configuration
designator, not a model?
{At this point, IRL, I did a whole lot of reading and
looking.}
I looked in some old PDP-11/05-10 price lists... (More "11/21"s... :-), and
did find some -11/05 models with pretty large alphabetic model designators,
e.g. "11/05-LB", but no "11/10-NC". However, the "Options and
Modules List"
online from June, 1974 _does_ list the "11/10-NC" - it describes it as
"KD11-B, BA-11DC 10.5 INCH BOX, MM11-L, KY11-JE, CONFIG 4, 115V". There's
also an "11/05-NC", the same except for a "KY11-JD" (that must be for
the
different number printed on the faceplate). No idea what the "CONFIG 4"
means...
However, the real victory came when looking in my just-acquired copy of
DEC-11-H05AA-B-D.pdf. I see it also includes a "DEC-11-H05AA-B-D Supplement
1", which is the "PDP-11/05, 11/10 10 1/2 inch mounting box and power
system"
- and that _does_ describe the NC/ND (120V/240V). And those have a slightly
different backplane (below) from the ones described in DEC-11-H05AA-A-D; so
that's a fourth model of -11/05-10 backplane - and it does differentiate
the -11/05N-10N (as I will call them) from the others.
I was lying a little bit when saying NC. Actually it is the ND model for
obvious reasons. But the difference is subtle. Just the power input module.
I have three machines with three different
backplanes. One 11/05-NC,
one 11/10 in 5.25 inch box and one 11/05-S in BA11-K.
What kind of backplane does the second one have; one of the 2xMM11-L CPU
backplanes (one with, and one without, an SPC slot), or the 1xMM11-L?
It is the 1xMM11-L type of backplane. But the system came with an extra
5.25 inch memory box. Identical to the CPU but different backplane for
three more MM11-L modules
http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-10…
NC can have two MM11-L. No SPC slots.
Got it. I was very confused, because the 11/05-10 manual (DEC-11-H05AA-A-D)
says that the 2xMM11-L backplane has one SPC slot (the last one, IIRC).
However, as noted, the -11/05N-10N apparently has a different backplane, to
accomodate the M9970 dual console serial line connector card. (That
backplane
isn't documented in the DEC-11-H05AA-A-D -11/05-10 manual I'd been looking
at
- that manual doesn't show a space on the 2xMM11-L backplane for that
card).
However, the later "PDP-11/05, 11/10 10 1/2 inch mounting box and power
system" manual _does_ describe it; and in adding a slot for the M9970, they
lost the SPC slot in the 2xMM11-L backplane.
So I guess that's the one you're talking about here?
From: Bill Degnan
The more useful box is the S model because the
more standard
enclosure
can be used for testing other UNIBUS cards more
easily or than parity
RAM.
?? How is is better? The BA11-D box will hold hex cards? Or are the SPC
slots
in the 11/05-10S backplane MUD slots? Or is it just that the BA11-K will
hold
DD11-C/D backplanes, with MUD slots? (I don't know if there are any MUD
backplanes that go into the BA11-D - at least without a hand-mod to the
power
connector.)
Noel