> From: Richard Loken
> I have never heard of her before and had no idea.
There are two books from participants in the development of the AGC
software (both of which I highly recommend) which mention her:
Hugh Blair-Smith, "Left Brains for the Right Stuff: Computers, Space, and
> From: Nigel Williams
> I'm wondering if on a real 11/70 there is a 5mm gap between the
> masthead and the rack blanking panel below it?
If by "masthead" you mean the thing DEC calls a "Logo Panel" (see 11/70
Engineering Drawings, 'Unit Assembly', pg 1 of 5), it's the same as all
> From: Nigel Williams
>> it's the same as all the other PDP-11 etc logo panels,...
> when you say "same", as in the same text as well?
Sorry, I should have been more explicit. 'Same physical shape' is what I meant;
just different stuff painted on the insert.
> thanks for the
Anyone have a copy of the RK611 Technical Manual (EK-RK611-TM-001 is the
version that's attested)? It's not online.
(I have a copy in my fiche set, but my fiche reader died - no, it's not
the bulb, already changed that! :-)
Noel
> From: Adrian Stoness
> someones bid on them eh hopefully not a scraper
Well, a scrapper would want to pay as little as possible, so anyone
who wanted to actually save the system should be able to get it.
There are a couple of bids on it, but the amounts are derisory.
I hope
For those who saw this item:
https://www.ebay.com/itm/183639487495
but didn't know what it went to (Web searches for "5409818" and "5009817"
didn't turn up anything useful for me), it turns out to be a "Configuration
2" backplane for a PDP-11/05-/10:
> From: Jerry Weiss
> I turned BEVENT off and it boots successfully. I am not immediately
> sure why this is necessary.
If an LTC interrupt happens before the OS has set up the LTC vector, etc,
hilarity ensues.
E.g. the LTC has to be turned off before UNIX V6 will boot on an -11/23:
> From: Christian Corti
>> An additional issue, I think, is that Google is deprecating sites that
>> use HTTP, versus HTTPS.
> Not true, in contrary, Google even crawls through FTP sites :-)
I did say "deprecate", not 'ignore totally'! :-)
Here's what I know: An e-commerce site
> From: Brent Hilpert
> I wouldn't have thought any of the (various 11 CPU) ODTs used
> interrupts for the console
They don't.
> Don't know which CPU Noel was referring to.
The OP was having problems with an LSI-11 (M7264 quad card); I was working
with an LSI-11/2 (M7270 dual
> From: Allison Parent
> ! Seriously? ... Memory of some form there is a must.
I don't know about you, but my approach in looking into hardware issues is
often to start by reducing things to the simplest possible configuration that
exhibits the failure.
(I asssume the various reasons
> From: Steven M Jones
> imagine that a law is passed in a far away land, and the site owner
> decides it's is too risky to bother with, and they then take the entire
> site down - wiki and fora - with no warning and no access to the
> material...
> ..
> I would
> From: Paul Birkel
> But which bus? There are three ...
So I'm clearly not very awake this morning. I can only think of two major
quad-width DEC standard slots - SPC (UNIBUS) and dual QBUS. What's the third
- PMI? (MUD is hex, as is Fastbus.) Or OMNIBUS, if we're not restricted to
> From: Seth J. Morabito
>> having stuff scattered across a zillion personal pages (be they blogs,
>> or whatever) is going to make it hard to find the useful one when
>> needed
> The sheer vastness of content available, combined with a Google
> monoculture, combined with
> From: Eric Christopherson
>> Anyway, the whole 'how do we find the info' is a part of why I started
>> working on CHWiki, once I discovered it
> Psst: it would've been a good idea to share the URL to CHWiki.
Well, that passing reference wasn't an attempt to get people to go
> From: Paul Koning
> Isn't the interrupt disabled by RESET?
Nope. On the -11/03 and KDF11-A, BEVNT is wired straight into the CPU, and
there's no internal register to control it.
The BDV11 does have a register which can enable/disable the LTC (it connects
BEVNT to ground via a
> I didn't fully disassamble the program
I have now done so; the -YK is _exactly_ the same as the -YA (the later ones,
which are minorly different from what's in the manual), except that the HSR
address (177550) has been replaced as the primary device address by that of
DL11 #1, in the second
> From: Paul Birkel
> Apparently the VT20 used the M792-YK as its bootstrap; the Field Guide
> is silent regarding the boot device and M792 documentation stops
> earlier in the series of variants.
An M792-YK recently sold on eBait; I didn't get it, but I did manage to get
the
> From: Charles Morris
> my last couple of posts don't seem to be showing up?
I see several posts from you.
To check suspected failures, look in the archive:
http://www.classiccmp.org/pipermail/cctalk/
because just because you're not getting a personal email copy, doesn't mean
it
Wasn't MANX supposed to be coming back up after moving? Did that never happen?
Noel
>> Al Kossow via cctalk writes:
>> Buried in a filing cabinet in the basement with a sign that says
>> "Beware of Leopard".
Good one!
> From: Seth J. Morabito
> I'm going to respectfully disagree .. the proliferation of modern
> JavaScript frameworks that are designed
> From: Jonathan (systems_glitch)
> Yep, fun times on LSI-11/2!
Heh, this one was _utterly trivial_ compared to the 'must have working memory
at 0 or ODT won't start'! (I don't think I've ever seen that one in DEC
documentation anywhere...)
Noel
> From: Brent Hilpert
> I've seen pieces of HP high-end lab equipment from thru the 60s that
> used tin plating on the PCB edge fingers, mating into gold-plated edge
> connectors on the backplane.
ISTR that DEC used bronze contacts in their backplanes, but basically all the
> From: Charles Morris
> Is there any standard pinout for 20 ma current loop using a DB-25
> connector, analogous to the well-documents RS-232 serial interface?
> ...
> Or would you recommend I use a different connector entirely? .. Maybe a
> Jones 4-pin would make more
> They try and list all known DEC manuals and print sets
Ooops, my mistake; the coverage is much wider than that (they default to
DEC). On the home page, there's a pull-down menu labelled "Company",
which lists over 100.
> From: "Paul Birkel"
>> the KE11-B I also just found
> From: Glen Slick
> This?
Yes; thanks!
I don't know it didn't show up in my Web searches - I tried a number of
different things, no luck.
Also, http://manx.classiccmp.org/ (which is the medium-old URL I had for it)
redirects to something that has no working link to Manx; probably
> KE11-B Field Maintenance Print Set
> http://manx-docs.org/details.php/1,9361
> the KE11-B I also just found (IIRC, on one of the collections they list
> as indexed).
Oh, speaking of KE11-B's, does anyone have either the Technical or User's manual
for it (I couldn't locate
> KE11-A Field Maintenance Print Set
> http://manx-docs.org/details.php/1,9358
Speaking of KE11-A's, does anyone know what's behind the bidding wars on
recent eBay KE11-A component board listings, e.g.:
https://www.ebay.com/itm/372685033144
AFAIK, the boards (a complete set is an
> From: Jon Elson
> I have NEVER had even the SLIGHTEST damage with FedEx, even their
> ground service. This could just be statistical chance
This. I once had FexEx Ground destroy the entire packaging of a shipment (one
of those rigid plastic tubs, sealed closed with those tension
> From: Al Kossow
> I don't even have time to deal with all of my paper.
Understood. A huge 'thank you' for all the work you have put in, to saving
and making available a massive quantity of old documentation.
Given that we have stuff scattered across a number of sites, rather than
> From: Ethan Dicks
>> Speaking of KE11-A's, does anyone know what's behind the bidding wars
>> on recent eBay KE11-A component board listings, e.g.:
>>
>> https://www.ebay.com/itm/372685033144
> Perhaps someone has a broken KE11-A
Must be two such people, though - I
> From: Antonio Carlini
> I think the best thing to do would be to get the data into manx. Manx
> feels like the right tool for finding manuals.
Yes, I agree. Replicating the data, in a system which isn't organized to
hold it (i.e. the CHWiki) would be a desperation move, only to be
> From: Zane Healy
> What I found really odd was that it had part numbers and manual names
> from one version, but when I clicked on the links it said no known
> version online.
They try and list all known DEC manuals and print sets that ever existed, so
just because something is
> From: Jon Elson
>> On 08/22/2019 12:47 PM, Tom Uban via cctalk wrote:
>> On a possible related note, I am looking for information on converting
>> CISC instructions to VLIW RISC.
> I think it might end up looking a bit like the optimizers that were
> used on drum
> From: Kevin Monceaux
> I'm not sure what it is about phone systems. ... I don't know why I'm
> doing this.
Oh, and the rest of us have a real use/need for old, slow, small (by modern
standards) systems that use a ton of power? :-)
Noel
So I have just acquired a copy of the service manual for the RP04 drive (ISS
model 733). Does anyone have an immediate need to look at this? If so, I can
put it on the top of the 'to scan' stack.
Noel
> From: Mister PDP
> listed back there were numerous bad addresses all over memory.
> ...
> I cannot find schematics for any of the boards
You can repair MOS memory boards where the board is basically working, but
just has some failing memory chips, without schematics.
First you
This item:
https://www.ebay.com/itm/133136230586
is poorly titled, so people's searches might not find it; the M8319 is a KL8A
4 channel EIA RS232 or 20mA current loop serial hex I/O card for the PDP-8/A.
Noel
> From: Paul Anderson
> $325??
Well, they did list it with a 'Best Offer'. I figure the third time they get
an offer of US$100 (or whatever the thing is actually worth, I don't track
PDP-8 board values), it might become clear to them that they are way
optimistic on the value.
I once had
> From: Ethan Dicks
> Did anyone here get it?
Yeah, me - although I didn't expect to! Because of my work on DEC indicator
panels (this one's a 10-1/2" panel, unusual):
http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html
I put in what seemed to me a lowish bid, expecting not
> From: Douglas Taylor
> I'm putting together a MicroPDP-11/23 in a BA23 box. Have the M8189 CPU
> quad width board and the bulkhead cabinet kit .. how the cabling goes
> from the M8189 CPU board to the bulkhead cabinet kit?
I _think_ this might be the cable you need:
> From: Josh Dersch
> descriptions of the PDP-11/45 DELPHI system
> ...
> moves on to Algol and LISP
I later became the 'owner' of that PDP-11/45 (our group at LCS traded an
-11/40, which EECS wanted for their DECSystem-20, for it).
That Algol and LISP were later moved to Unix
> From: Josh Dersch
> Any idea what ultimately happened to that 11/45?
MIT offered it to me as a gift, but I was a total idiot (and also didn't have
future vision), and as I was so busy with the IETF/IESG at the time (which
might have been the right call, given how the Internet - note
> From: Jim Stephens
> I don't know how to contact the maintainer for manx
There was discussion recently about that, and I did manage (with help from
someone here who provided his email - thanks muchly!) to reach him. We were
discussing how I could help update things, but a hurricane
Re: Cleaning an old keyboard
Hey, that spiel would be a good start to a great article on the CHWiki,
'Cleaning keyboards'! (Not sure if any of the other replies contained
anything worth picking up.)
Noel
So I just discovered that there are three wildly different variants of the
M7821 Interrupt Control card. More here, with images:
http://gunkies.org/wiki/M782_Interrupt_Control
I'll have to dredge around and see if I can find circuit diagrams for them
all; they are wildly different, the -C
So, I have a copy of the maintenance manual for the DJ11; is this something
anyone needs?n If so, I'll move it up the scan queue.
Noel
Hi, does anyone out there have any DM11 documentation? The only thing I could
find online is the "DM11-BB model control option manual" (DEC-11-HDMBA-A-D) -
and it's the impetus for this request, actually.
One page 1-5, pg. 15 of the PDF, it has a diagram of which boards go into
which slots on the
> From: Evan Koblentz
> I know of two RP04 drives in the wild. One belongs to a private
> collector. VCF has the other.
Right, but does VCF need it scanned?
Oh, one other place that might have one: the MIT MC KL10 had a couple of
RP04's; when it was taken away to Scandanavia, they
I finally got around to reading that note. My principal reponse is that it got
so
far down into details that I couldn't see the larger picture any more.
Going back to the original IBM 801 work, the RISC concept is very simple: to
make
the overall system as fast as possible; it did this by
> From: Grant Taylor
> How many different protocols / methods can we collectively come up with
> for how email can be transferred?'
Hey, this is the classic computers list, so you should only list early stuff,
(say pre-1990), and leave out all the modern crap (but I repeat myself).
> Erom: Eric Smith
Hey, thanks for taking the time to provide all those details.
As you no doubt saw, our emails crossed; I had managed to work out my own
what the difference was. I'd been looking at this page:
http://corestore.org/DEC2065.htm
and saw the two backplanes, and assumed one
> From: Al Kossow
> These showed up on eBay, I'd been looking for them for over twenty years
As in, 'you all shouln't bid on those so I can grab them'? Or do you want
someone here to get them, and send you scans?
If the latter, people should co-coordinate so they aren't bidding against
> Although, with the 3 SPC slots - although they are on UNIBUS A, and only
> UNIBUS B has the 18-bit capability
Du. My brain finally turned on.
It is of course perfectly possible to run UNIBUS _A_ (where the SPC slots are)
in 18-bit mode too - although the _RH11_ can't use it that
> From: Jörg Hoppe
> UniBone can be used in UNIBUS-A SPC slots in 18 bit mode without any
> extra adapters? And can emulate an RH11-C there
As far as I can see, yes.
> even if the RH11 is supposed to run in UNIBUS B?
Well, all RH11's have both UNIBUS A and UNIBUS B; under
> the Revision J prints (September 1993).
Ooops, typo: '1973'.
Noel
> From: Eric Smith
> One version of the RH11 added a small FIFO (called a "silo" by DEC,
> IIRC) in the data path. I don't recall which suffix that was, nor
> whether it was the version used in the KS10.
Well, the -AB has the FIFO, according to the Revision J prints (September
> maybe the two can be jumpered together (the way the two UNIBI in the
> KD11-A/D can).
Actually, now that I think about it, that might be the reason for the order
of the UNIBUS A out B in/out slots in the backplane:
https://gunkies.org/wiki/RH11_MASSBUS_controller#Backplane_layout
One
> From: Jörg Hoppe
> did DEC construct 18bit mutants for a few PDP-11 peripherals to run
> them in KS10?
Yes and no. There were two 18-bit UNIBUS devices, but they were originally
done for the PDP-15 (DEC's last 18-bit machine). They were the RK11-E and the
RH11-AB. When the KS10
> From: William Donzelli
> My manual only mentions the M200, but it may be an early edition
What is it, and what date is it? DEC-11-HCRB-D, avilable online, is
March, '72. DEC-11-HCRMA-C-D is June, '73.
I see that EK-CR11-TM-004 is also available online:
> From: William Donzelli
> Can the DEC M8291 CR11/CM11 controller card work with a DEC branded
> Documation M600 reader as well as the M200?
Should do; the 'CR11/CM11 system manual' (DEC-11-HCRMA-C-D) mentions it,
although it doesn't provide extensive coverage.
I guess that version
> From: Guy Dunphy
> JBIG2 .. introduces so many actual factual errors (typically
> substituted letters and numbers)
It's probably worth noting that there are often errors _in the original
documents_, too - so even a perfect image doesn't guarantee no errors.
The most recent one (of
> From: Thomas Moss
> Probably a long-shot, but I'm looking for a DECtape drive for my
> PDP-8/e.
Long shot indeed! DECtape drives are one of the rarest DEC peripheral, and
un-surprisingly, one of the most valuable. (A TU56 sold on eBait for $7K back
in 2015.)
Would a TU55 do, or
> From: Chuck Guzis
> One could argue that it's just as similar to FORTRAN (cf. computed GOTO
> and logical IF statements).
It probably worth pointing out that I never used COBOL, and have little
knowledge of it. So when one reads "it is vaguely reminiscent of COBOL, as it
has a
Ooops, editing error:
> Although one could build a system which has aggregatable addresses, used
> for path selection, but hid them from the hosts, and used an 'invisible'
> mapping system to translate from them to the aggregatable 'true'
addresses.
Should have been "to translate
> From: Fred Cisin
> Is that message about 1) history of internet? (THANK YOU for specifying
> "internet", otherwise "computer to computer" involves much older history.
> ...
> those messages were sent on PRECURSORS to the internet, NOT on the
> internet.
Did you mean
> From: Chris Zach
> The MSV11-QC board ... failed startup diagnostics with what looks like
> a stuck bit. .. now I need engineering schematics for that board so I
> can replace one of the 41256 memory chips. On the positive side it looks
like
> a pretty obvious stuck bit,
> From: Rob Doyle
> Your memory is correct. The RH11C was the buffered version of the RH11
Umm, both the -AB and -B have FIFOs - confirmed from the prints. (I have
an M7294 if we want to confirm that the prints aren't confused.) Now,
maybe the -C has a _bigger_ FIFO (e.g. large enough to
> From: Nigel Johnson
> No, your home has an intranet!
Can you please provide a crisp, definitive, technical definition of what an
'intranet' is (similar to the one I just provided for 'internet' - "disparate
networks tied together with packet switches which examine the internet-layer
> From: Richard Pope
> Isn't the proper term for my network of computers here at home:
> internet
It depends on what's inside it.
An 'internet' is a collection of disparate networks tied together with packet
switches which examine the internet-layer headers of the packets passing
> From: Rob Doyle
> http://www.bitsavers.org/pdf/dec/unibus/RH11-C_Engineering_Drawings.pdf
Oooh, thanks ever so much. Not sure how I missed that when I looked on
BitSavers for RH11 stuff! Very illuminating - eventually! The M7294-YA seems
to be a manual ECO to the M7294; there's a
> From: Jay Jaeger
> CCITT Group 4 lossless compression
That's very good indeed. I scan text pages in B+W at slightly less resolution
(engineering prints I do higher, they need it), but compressed they turn out
to be ~50KB per page, or less - for long documents (e.g. the DOS-11 System
> From: Pierre Gebhardt
> there seems to be a copy of the maintenance manual in the unibus-folder
> on bitsavers: EK-DJ11-MM-003_DJ11_Maint_Man_Aug76.pdf
Argh! I looked in that folder, but didn't see it! (And Manx says its not online,
either.)
> Would be worth checking the
> From: Al Kossow
>> This is documented in NASA's official history of Project Mercury, for
>> which it was invented.
> could you post a pointer to the document where this appears?
If the reference is to:
Lloyd S. Swenson, James M. Grimwood, Charles C. Alexander; "This New
> From: Jason T
> didn't know you were at the show. Thanks for coming out!
I wasn't! :-) This is via Paul A, who was there.
I don't recall where they were before they got free-piled (he told me who it
was who had it, but I had no particular reason to store those bits in my
memory).
This is a long shot, but...
There was an Able Computer document at VCF Midwest, and through a
miscommunication, it wound up on the 'free' pile. Did anyone here get it?
If so, I'd like to try and get it scanned in, and made available.
The thing is that documentation for Able products is
> From: Christian Corti
>> we only have those for the UNIVERTER and QNIVERTER
> And what about the stuff on bitsavers?
That's where I got my copies of the UNIVERTER and QNIVERTER docs. I guess I
missed grabbing a few; and I see a few more have been added since I last
looked:
> From: Paul Koning
> Some early machines, the PDP-6 I believe is an example, have
> "registers" in the ISA but they actually correspond to specific parts
> of main memory.
The PDP-6 and KA10 (basically a re-implementation of the PDP-6 architecture)
both had cheapo versions where
> From: Eric Smith
> Code can be executed from the MMU PAR registers on processors with
> 22-bit addressing (11/23, 11/24, 11/44, 11/70, and J-11 based systems).
My QBUS machine is apart at the moment, so I can't verify this before
posting, but I don't think this hack works on the
I recently picked up a copy of "CTS-300 - DIBOL Language Reference Manual"
(because when I went to do a CHWiki page for the language:
http://gunkies.org/wiki/DIBOL
I could find almost nothing about it online); does anyone have enough of a use
for this that I should put it in the high-priority
> From: Chuck Guzis
> Calling DIBOL "COBOL-like" is stretching things quite a bit.
OK, so I'll change it to "vaguely COBOL-like"... :-)
Seriously, though, there some high-level similarities, and not just
the purpose...
Noel
> From: Jay Jaeger
> Yeah, info does seem to be scarce. Not even in my LEVAX fiche set.
My fiche set has the Technical Manual, and also (in the wirelist
section) the wirelist.
Not sure how to get it to you, though. I stuck it in my industrial-grade
scanner at its highest resolution; no
So I've decided to try and build up a KE11-A Extended Arithmetic Element. I
have most of the boards (although I*m missing a M234 Register dual-width
board, if anyone has one).
The main thing I'm missing at this point is a backplane. I do have a BB11
(which came out of an old piece of data
Does anyone have an -11/24 in a BA11-A 10-1/2" mounting box? If so, I'd love
some images of the internals, if possible!
I ask because the BA11-A doesn't use the usual MATE-N-LOC connector for
sending power to the CPU; instead it has bus bars, and in the -11/44 (the
usual denizen of this box), the
Please make sure your messages to CCTalk have a Subject: line, otherwise
they end up being 'un-clickable' in the archive, like this:
http://www.classiccmp.org/pipermail/cctalk/2020-February/date.html
It's possible to hand-edit the URL's to see them, but it's a PITA!
Noel
So, a while back someone had a broken MSV11-Q QBUS memory card, and needed
info on them. I said I'd provide same, but then got distracted. Well, I
finally got to it, and it's been added to the CHW page for them:
https://gunkies.org/wiki/MSV11-Q_QBUS_memory
It includes a table which says which
> From: Ian McLaughlin
> I can confirm that about 6 months ago I gave this very information to
> our corporate locksmith, and he was able to make a key for me that
> works.
Thanks for the confirmation that that info is sufficient to produce a working
key. I have updated the page
From: Tom Uban
> Does anyone have information on having a replacement PDP-11/05 key made?
Google is your friend; here:
https://gunkies.org/wiki/PDP-11/05#Keys
I don't recall if there's anough info there to create new keys without an
original to copy. At one point I made a run of
Hi, a heads-up on sending expensive items via FedEx. They appear to have a new
policy, limiting honouring insurance coverage; so, in my opinion, they are
now unsuitable for shipping valuable items.
Data point 1: a couple of months back, I bought a PDP-11/40 on eBait. It was
shipped via FedEx in
> From: Bob Smith
> saw a comment that this belonged to CJL.
Chris Lindblad? Sorry, I'm drawing a blank on someone with those initials who
is connected with the LINC.
> From: Jon Elson
> Wow, those were fairly rare back when, and now there may only be a
> couple in
> From: Paul Koning
> I suppose they still charge you an insurance fee according to what you
> declared as the value?
Yes, IIRC.
> This seems like a pretty clear case of fraud, and you should report it
> to the authorities.
Well, at the time, I thought it was just a local
> From: Chris Zach
> Just checked the configuration and block mode DMA *is* off.
Interesting. So it's not bklock-mode on the QBUS which is screwed up, but
normal QBUS transfers. That jibes with the comment abour "gate array
incompatibilities" (which I take to mean "errors" :-).
>
> From: Jerry Weiss
> uNOTE # 028 indicates that MSV-11 JB/JC (M8637-B/C) doesn't do block
> mode.
I went and looked at uNOTE #28, after I found it (it's not in the initial set
of uNOTEs, but in the second set - the so-called 'OEM uNOTEs"; note that the
numbers were re-used between
> From: Chris Zach
> We have to move fast though, this needs to be cleaned out. How can
> people help me on this?
I'm sure there must be institutions that would love to have the PERQs; they
were very important machines, historically, and are quite rare.
Alas, although I'd normally
> From: Jerry Weiss
> Sorry about the uNOTE confusion..
No problem, it only took me about a minute to find the right one; my note was
to warn other people who didn't know about the number duplication.
> If you look at the Memory Comparison table in this OEM uNOTE, it only
>
> From: Mark Matlock
> Are you able to use a Qbus MTI controller in the 11/84's Qbus section
> of the backplane? This is something I've often wondered about but never
> tried.
I looked into this in some detail, but I don't know:
> From: Chris Zach
> in place of my quad height 11/73 CPU with 2mb memory.
Sorry, which exact quad-height CPU card?
{As someone else has previously pointed out, the /73 and the /83 are basially
the same machine (roughly the same CPU board - KDJ11-B, perhaps with different
clock
Wow:
https://www.ebay.com/itm/353062352448
I've read manuals for these, but I've never even seen a picture of one before.
Noel
Hi, I'm looking for documentation on the MSV11-R; there's next to nothing
online. (An -11/84 manual gives config, but that's all I cam find.) There is
an 'MSV11-R User Guide' (EK-MSV1R-UG), but it's not online; I don't suppose
anyone out there has one?
I'm trying to confirm an online report that
> From: Chris Zach
> http://www.aceware.com.au/acms/images/Invent/GeneralRoboticsMSV_11R.jpg
I don't know what that is, but it's not an MSV11-R. Here:
https://gunkies.org/wiki/File:MSV11-R.jpg
is an MSV11-R.
> Maybe it's PMI memory without ECC? I count 18 bits across which
> From: Stephen Buck
> Looking for a pair of DEC RL02 drives, working or otherwise, for a
> PDP-11 restoration destined for a local computer museum
Well, there's this:
https://www.ebay.com/itm/264277971437
It's an RL01, not an RL02 as you were enquiring after, but RL02's are
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