11 Dec
2002
11 Dec
'02
1:59 a.m.
A google search for M7095 turned up www.jtcomputer.com so I already sent an
email earlier tonight inquiring about a M7095. Are they a decent place to
do business with?
I just tried an old barrel key from a Kryptonite lock and it does work (a
little rough to insert & remove) so that takes care of that problem.
I didn't get any disk subsystems. The rules of the surplus department where
I aquired the CPU dictate that disk drives be destroyed before systems are
made available to the public.
The I/O cards that were installed were an M7521 DELUA ethernet, CMD
CDU-720/TM SCSI, M7819 DZ11-A octal serial, Digital Pathways TCU-150 clock
module?, M7258 LP11, Datasystems DLP-11.
The CPU came in a rack that is about three times the height of the the
PDP11/44 and about 1.25x as wide. It's a Digital rack, but I didn't see a
model number on the rack. The rack itself really heavy. They used a
forklift to load it into my van and I was able to get it out of the van
myself with the careful application of gravity, but there was no way I would
have been able to get it into the house. I did download the User's Guide /
System Technical Manuals which came in handy when I got stuck trying to
figure out how to release the rack slide lock mechanism. Now I've got the
CPU out of the rack and in the house were I can work on it.
The rack did have bulkhead connectors and cables for the M7521 DELUA
ethernet (AUI) and the console (DB25). The rack had a couple of other
connectors I didn't recognize, I think they must have been cabled up to the
M7819 DZ11-A and M7258 LP11. There is no breakout pod for the M7819 DZ11-A.
The DLP-11 had a very long LPT ribbon cable attached. It might have
originally been attached to a huge Genicom? printer that was also available
at the surplus place, but I passed on that at the time.
I inspected the insides before thinking about trying to power up the CPU and
when I realized the M7095 was missing (I wonder why it was removed?) I
didn't go any further. Also, while the power supply is configured for
120VAC it has the high current (20A) plug with one of the lugs rotated 90
degress and I don't think I have any compatible outlets in my house so that
is yet another challege to solve.
If I do get the CPU running, then I'll have to figure out what software I
should try to run on it. I don't really know much about PDP11 software yet.
-Glen
From: John Lawson <jpl15(a)panix.com>
Reply-To: cctalk(a)classiccmp.org
To: cctalk(a)classiccmp.org
Subject: Re: Acquired a PDP11/44, but missing M7095
Date: Wed, 11 Dec 2002 01:58:00 -0500 (EST)
On Tue, 10 Dec 2002, Glen S wrote:
_________________________________________________________________
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I recently acquired a surplus PDP11/44 (my first
real PDP11) and it
appears
that it is in reasonably good condition, but
after opening it up to
check
out what modules were installed I realized that
it is missing the M7095
control logic module, one of the 5 core modules that make up CPU.
Anyone
know where I can find one of these at a
reasonable price, or have a good
spare that they care part with?
Congratulations! Join the Club.... ;}
A lot of DEC Stuff is listed here ( they also sell on eBay ).
www.jtcomputer.com shows a M7095 - $25.00
Also, the keyswitch for the front panel is missing. Anyone know where I
can
find one of those, or is there an easy way to
bypass the switch?
Any barrel key will work... one of mine has flutes, but the other ( a
red plastic one marked 'anti static' has no flutes at all.
On the plus side a CMD CDU-720/TM SCSI controller
was installed so if I
get
the CPU running I hope it won't be too hard
to connect it to a SCSI hard
drive and tape drive.
Depends on the OS you use, and how you generate the new system.
Did you get any other peripherals, especially the disk subsystems that
were once attached? Is the console serial cable present? ( a longish
cable terminating in a DB25). Any other I/O cards? Have you powered the
machine on yet? Be careful of the power supply - they're REALLY deadly
with the covers off. ALso be sure the fan deck is running.
Oh yeah - did you get any Doc with the system... or can you get a copy
of the PDP-11/44 System Technical Manual and the System User's Guide...
these will be most helpful getting the beast to wake up.
Keep us informed of your progress... there are several /44s up and
running among us.
Cheers
John