> 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 crystals
> 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 t
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 cop
> It includes a table which says which chip each bit in the memory is
> stored in
Oh, there's an entry (well, actually two) missing from the table, which is the
parity bits (2; byte parity); I'll work them out and add them. (I know, by
elimination, which two columns of chips are the parit
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 c
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
> 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 acquisit
> 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 d
> 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:
http://bitsavers.informatik.u
> 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 o
> 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: 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
Pro
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 fro
> From: Brent Hilpert
> Roughly, IP took care of a common addressing scheme and a common
> packet presentation, TCP took care of end-to-end flow control.
Yes on IP, but TCP's main function is reliability - much of the mechanism of
TCP (sequence numbers, acknowledgements, timeouts and
> 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
hea
> 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
thr
> 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 "int
> 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 detail
> 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: 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, jus
> 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
1
> 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 progra
> 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 way
> 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 appe
> 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
e
> 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 'Data
> 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
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 s
> 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).
> 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:
ht
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 hyper-rare
> 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 J-
> 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
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: 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 the
> 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 V6
> 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: 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 docume
> 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 mi
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
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 has
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
> 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 cam
> 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
> 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 t
> 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
brin
> 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 tap
> 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 wa
> 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 memory
> 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 M7210
> 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 either
> 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 (IIRC,
> 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: 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 ough
Wasn't MANX supposed to be coming back up after moving? Did that never happen?
Noel
> 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 sen
> 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
boards
> 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 strongl
> 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: 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 loo
> 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: 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
PDP-1
> 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 ca
> 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 fo
> 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
>> 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 to
> 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 transisto
> 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:
> 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 sell
> 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 did
> 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
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: 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:
https://w
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:
http://gunkies.org/wiki/PDP-11/05#Backpla
> 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 t
> 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: Eric Smith
> two separate backplanes that are combined for the RH20s (if
> present), one backplane for the A through D positions (upper 2/3 of
> each module slot), and one for E and F.
How odd. DEC was quite happy to do hex backplanes elsewhere, and it looks
from the photo
> 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 w
> So my new theory is that it's the MBox (either the backplane, the
> boards, or the wiring from it to connectors, etc) that is the difference
> between the KL10-A and the KL10-B.
So I wuz confused; the second backplane is not the MBox (which is apparently
on the main CPU backplane), b
So I'm a little puzzled by something, and I was wondering if anyone
here knows the answer.
So early KL10's (KL10-A's, to be precise) only support a single DTE20, and
no RH20's. Later ones supported up to 4 of the former, and up to 8 of the
latter.
I always supposed this to be part and parcel of t
> From: Evan Koblentz
> what the owners plan to do in the future.
Sell the Apple I and retire to a tropical island on the proceeds, if
they have any sense! :-)
Noel
> From: Nigel Johnson
> Anybody have any docs on the DEC LSI 11/93 (KDJ11-E)?
Info on the -E is thin on the ground. The User's Manual (EK-KDJ1E-UG-001)
is available online, though, which is a start - it gives info on how to
configure it, etc.
> I am trying to run it in a BA23 backpla
> 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).
S
> From: Tomasz Rola
> Is it really down?
I suppose this is actually good news, in a way - someone must have been
trying to use it, to notice that it was down! :-)
So let me take this opportunity to appeal once again for people to contribute
content; I've added a lot of PDP-11 stuff, and
> Tomasz Rola
> However, I have added this line to my /etc/hosts:
L-rd, I must be getting old - it never dawned on me to do that. Anyway,
that shows the server was fine, it was just the missing DNS entry.
Back now.
Noel
> From: Diane Bruce
> Works fine.
Probably a left-over cached entry; neither my ISP's DNS, nor MIT's ("Host
gunkies.org not found: 3(NXDOMAIN)") can resolve it at the moment.
One year Tore was off hiking or something, and it took a few days, but past
experience is that he will get to it.
> From: Tomasz Rola
> Is it really down? Could it come back?
Tore forgot to pay the bill for his DNS entry; this is the third year in a row
the exact same thing has happened, on the exact same date! :-) :-( I've
already sent him an email about it, this morning; hopefully he'll get with th
> From: Liam Proven
> This is *epic*.
Indeed. I was blown away by the complexity of his technique for reading
the digits.
I can't believe there wasn't a much easier technique, though, e.g. using a
logic analyzer and a small program to read through the ROS!
Perhaps the challenge of doing
> From: Al Kossow
> Does anyone know where Steve Rothman is?
And also Bill Weiske, who's listed as the go-to for the KS11.
Noel
> From: Al Kossow
> It is in the Dick Best Options and Modules List 197503
Ah, thanks for the pointer; I see it's listed as a "Memory Extension
Control" - not sure that tells me much, alas!
Interestingly, it's not in the earlier Options and Modules lists, e.g.
June '74, but the KS11 is i
While I asking on the TUHS list about the KS11, someone mentioned the MX11
Memory Extension Option, described as "enabl[ing] the usage of 128 KW memory
(18-bit addressing range) ... developed by the Digital CSS (Computer Special
Systems)".
I'm not familiar with this, and I couldn't find anything a
> From: Steve Malikoff
>> According to this page that Dennis Ritchie wrote ...
>> https://www.bell-labs.com/usr/dmr/www/picture.html
> It states that their 11/20 had a KS-11 memory management unit, was
> that mandatory for running v1 Unix on an 11/20?
Well, the page does say
> From: Joe Zatarski joezatarski at gmail.com
> The posts you mentioned were sent to cctech. .. that list is
> moderated .. You'll notice these posts are now in both archives.
Ah, that could be it. I thought I'd found them in the Subject: thread
archive at the same time they weren't
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