This would be the "11X44" configuration where the 11/44 is mounted in a 40 inch
top-loading H9642 cabinet ("corp cab").
See http://bitsavers.org/pdf/dec/pdp11/1144/1144_UsersGuide.pdf, Figure 4-5
(page 4-7)
-Original Message-
From: cctalk On Behalf Of Zane Healy via cctalk
Sent:
Selectron Vacuum Tube: https://www.ebay.com/itm/174977901251
Really nice photo-shoot! I wonder what the back-story to this particular
tube might be.
I don't think that $16.18 shipping would be, um, adequate protection by any
measure.
Cheap, but not so sure about "cost-effective" .
Marc: Do you have the 11/40-specific wiring harness? Assuming that you do
it's a bit tricky -- not so much mounting a given supply (aside from the fact
that they are heavy and awkward to work with even when minimally populated),
but because there is a very tight tolerance between them to
2/12/2021 16:37, Josh Dersch via cctalk wrote:
> On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk
>
> wrote:
>
>> Does anyone recognize the (presumably) DEC power supply on the front
>> half of the rack-bottom in the 11/44 listing at:
> It's not a DEC power
Seems to me that the actual coil resistance will limit the max-current at lower
voltages. 20 A through wire sized for 1 A seems ... unlikely?
-Original Message-
From: cctalk On Behalf Of Mike Katz via cctalk
Sent: Wednesday, December 8, 2021 5:58 PM
To: General Discussion: On-Topic and
Does anyone recognize the (presumably) DEC power supply on the front half of
the rack-bottom in the 11/44 listing at:
https://www.ebay.com/itm/363640137050
Blurry photo, but it looks like there are a 4x3, a 3x3, and a 3x5 Molex
connector, and two brown mini-modules protruding from the
Yes indeed. No response whatsoever :-<. Not even a receipt acknowledgement.
From: Adrian Stoness
Sent: Friday, March 11, 2022 10:21 AM
To: pbir...@gmail.com; General Discussion: On-Topic Posts
Subject: Re: Digitronics P135-20 Paper Tape Punch
did u try talking to that outfit to see
I have here in my hands a DEC H222A (16Kx18), part of a MM11-DP, that took a
blow at sometime in the past. In consequence there are a number of small
parts damaged (snapped diode, crushed axial electrolytic, chipped mica
capacitor, cracked/broken SIP resister net) but those all appear to be
I have the mechanism for a Digitronics P135-20 Paper Tape Punch.
It turns out that Surplus Sales currently has one of these for sale; see
item "(EQP) P135-20/35".
It is accompanied by a three-page snippet of a much longer manual for this
punch.
See:
That module was specifically called for in the RH11-AB dual-port
Unibus-to-MASSBUS interface as the Unibus B terminator. See
RH11-AB_OptionDescr.pdf, Section 4.24 (page 4-32/33), which has a fairly
lengthy write-up.
-Original Message-
From: cctalk On Behalf Of Mattis Lind via cctalk
> -Original Message-
> From: cctalk On Behalf Of Noel Chiappa via
cctalk
> Sent: Monday, February 21, 2022 10:19 AM
> To: cctalk@classiccmp.org
> Cc: j...@mercury.lcs.mit.edu
> Subject: Re: Is The M9312 Boot Module Essential?
>...
> Since the M9302 appears in EK-11034-OP-PRE2, with SACK
The conventional mounting for RL02 drives in a corporate cabinet puts one at
the top with the 6U CPU in the middle *but* that assumes that you have a
corporate cabinet designed for that purpose -- in which case the top is
missing so that the RL02 disk-pack can be directly accessed, and there is a
3U
front.)
-Original Message-
From: Chris Elmquist
Sent: Monday, February 28, 2022 2:08 PM
To: pbir...@gmail.com; General Discussion: On-Topic and Off-Topic Posts
Subject: DEC top-mount corporate cabinet
On Saturday (02/26/2022 at 03:21PM -0500), pbirkel--- via cctalk wrote:
> A t
Your description sounds like the cabinet has already been hacked by a prior
owner to remove a key component. And you're saying that the rear
cross-piece is present but both of the top cross-pieces are absent?
Completely weird. I'll contact you off-list and we can exchange photos to
determine
If it's mounted in a standard BA11-K, no. You should be able to pull it out
partially (sufficient to tip up if you have rotating slides) and then there
should be locking-buttons on the slides to prevent further extension
accidentally. Depressing those buttons will allow you to completely
Page #14 of:
http://www.bitsavers.org/pdf/tandon/TM848-1_TM-848-2_Product_Specification_Mar81.pdf
Unless "-02" is different than "-2" ...
-Original Message-
From: cctalk On Behalf Of Bill Gunshannon via
cctalk
Sent: Wednesday, February 23, 2022 6:13 PM
To: General Discussion:
Josh: Did you figure out a safe PS disassembly procedure? If so, what and how
did it go?
-Original Message-
From: cctalk On Behalf Of Josh Dersch via cctalk
Sent: Tuesday, February 1, 2022 1:49 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: HP 2100S Power Supply
A top-mount corporate cabinet looks like this:
http://www.cosam.org/images/pdp11-23/front2.jpg The "DECDatasystem"
front-bar in the photo is over the 1U strengthener that braces the upper
portion of the rack ... since there is no brace at the top (as yours has).
Your cabinet will work fine; in my
In case anyone else has been looking some of these, there is a listing for
multiple tubes-of-11 on eBay at a moderate price:
https://www.ebay.com/itm/123710245814
QTY-11 PCS. AMI SEMICONDUCTOR DC319 C04090 Integrated Circuit - (UIC
40378901)
It's documented in the DEC
In general: http://bitsavers.org/mailing_lists/cctalk_mailing_list/
However I just used Google Search on "PDP-8m Console Switch Problems - fixed!
CCTALK CCTECH" and the fourth hit was:
http://bitsavers.org/mailing_lists/cctalk_mailing_list/2006-September.txt
Then search in that page for
See the bottom of:
https://gunkies.org/wiki/DEC_standard_modular_regulators
I believe that you'll want one or more of these:
https://www.connectorpeople.com/Connector/TYCO-AMP-TE_CONNECTIVITY/1/1-48046
0-0
https://www.connectorpeople.com/Connector/TYCO-AMP-TE_CONNECTIVITY/1/1-48045
9-0
Note
Not a direct answer Chris, but back in the mid-70's I built a BM8 surrogate the
hard way (we were an impoverished neurophysiology lab so cutting corners
wherever reasonable) using banks of 2102L and S100 RAM PCBs. For density I
piggy-backed the 2102's to get 8Kbyte boards, then 3 boards gave
Thank you. I _would have_ probably also looked at the analogous
"MM8I_Schem_Aug69.pdf" print set. But those were antediluvian times; no
Bitsavers and DEC wasn't handing out free print sets. You could purchase them,
though -- I still have KA10 and MA10 documentation that I acquired that way
I have absolutely no idea! Jameco would have likely been my source for most
components although we did have a Hamilton-Avnet in town and it's possible that
ordered some components from them (I still have a NS databook with their
sticker on it). It's entirely possible that I fiddled with some
I like the fact that https://williambader.com/museum/vax/pdphistory.html
shows a cover image plus identifies the marking on the back cover
("EB-17525-20/79 070-14-55").
https://authors.library.caltech.edu/5363/1/MARprocieee06.pdf cites it in the
same manner. Apparently the editors at Proc IEEE
I've been researching uses of the IBM 2315 disk pack design in various
systems.
There appear to be two styles of sensors used for sector identification in
IBM 2315 disk pack designs. The IBM 2310 disk drive used an optical sensor
and notched-ring integrated into the spindle so that a U-shaped
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