Van: cctalk-bounces at
classiccmp.org namens John A. Dundas III
Verzonden: vr 13-10-2006 16:54
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: RE: Unibus Termination KnowledgeQuest
Trimmed the messages a bit...
At 1:33 PM +0200 10/13/06, Gooijen, Henk wrote:
-----Original
Message-----
From: cctalk-bounces at
classiccmp.org
[mailto:cctalk-bounces at
classiccmp.org <mailto:cctalk-bounces at classiccmp.org>
] On Behalf Of Don North
Sent: vrijdag 13 oktober 2006 0:29
To: On-Topic and Off-Topic Posts
Subject: Re: Unibus Termination KnowledgeQuest
John A. Dundas III wrote:
Interestingly the /70 has an M9312 in 1AB
_before_ any of the
processor boards and an M9302 (as expected) at the end of
the Unibus.
Thanks,
John
John, before you power-up your 11/70, check the position of the
M9312 ... My PDP-11/70 has the M9312 also in slot #1 ...
But, in contrast to all other UNIBUS PDP-11's (that I know),
the M9312 in the 11/70 is *not* in position A-B of slot #1, but
in position E-F! I will verify with the print set and if it is
indeed position E-F, I will make a note on my website to point
this out.
/Henk,
/I noticed this in your pictures. Interesting. I have the print set
/here too and I'll look also. While I personally haven't powered the
/machine up yet, I'm fairly certain it was running just prior to my
/acquisition from a former DEC FE. [I don't mean to implicate him if
/indeed the module should be in 1EF as it's possible the machine
/wasn't working and/or I might have inadvertently moved a few things
/around.]
/
/John
Hi John,
just to be sure I did not make any errors on my website, I checked
the 11/70 field maintenance print set, MP00824.
On page 6 is clearly slot 1 E-F for the terminator, with notes to it
which are on page 2. It only says that you install M930? or M9312,
but not both ... So, your system with the M9312 in slot 1 A-B is a bit
of a puzzle. I have not found what the usage is for slot 1 A thru D.
Perhaps diagnostic hardware? But my scans are the earlier ones, done
as TIFF, not PDF. In Win98SE easy to browse, but in WinXP a PITA.
- Henk.
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