> From: Chris Zach
> So these go *into* RK06 or 07 drives?
Yes; per the "Field Guide to UNIBUS and QBUS Modules". Also:
https://gunkies.org/wiki/RK611_disk_controller
reveals that the RK611 contains "five hex cards" (listed there).
Noel
> the later "pdp11 bus hanbook" (which, as mentioned, does not seem to be
> online yet, alas)
Arck, I'm a moron; Paul has pointed out to me that this is, in fact, online
at Bitsavers:
http://www.bitsavers.org/pdf/dec/pdp11/handbooks/PDP11_BusHandbook1979.pdf
It didn't show up in a
> From: Paul Koning
> You might give a precise source citation on that page.
Done:
https://gunkies.org/w/index.php?title=UNIBUS_Initialization=6842=25463=25451
Don't complain to me if the publication data is skimpy; that's all that's in
it! (I mean, we all know that DEC is in
So, I looked at the early editions of the "pdp11 peripherals hanbook", which
have good, detailed discussions of UNIBUS operations (at the back; chapter 5,
"UNIBUS Theory and Operation", in the 1976 edition), but in contrast to the
level of detail given for master/slave operations, and bus requests
> From: "Rob Jarratt"
> I did plug the connector back in, so that DCLO and
> LTC are connected, I just removed the ACLO pin.
Ah, OK, good. Pulling the pins from those Mate-n-Loc shells without the right
tool is tricky; glad you did it, because as Brent Hilpert pointed out, having
a
> The 'unused' gate in E52 is the one that the added wires from the ACLO
> ECO went to; I wonder if it was damaged by the -15V, somehow?
So, I checked, and the wire that goes from the plated-through hole next to the
etch cut on E70p1 winds up at E52p4 (the bus line on that transceiver),
> It was quite a struggle to separate those nylon connectors, is there a
> trick to it?
You mean the Mate-n-lok's? Not really; just make sure the catch is released.
What did you do about DCLO? (Oh, I think I see the answer, below looks
like you're relying on the pullup on K3...)
Finally found time to get to this one...
> From: Rob Jarratt
> However, there is a puzzle. On the CPU I found that the track from the
> pull up resistor to E70 has been cut.
I don't know about the "pull up resistor" part, but I have several KDF11-U's,
and _all_ of them have the
> and there is some circuitry driving the clear input on the second
> 123.
Never mind this section. I mis-read the print; the clear input is connected to
an _input_ of the flop below (which is also tied high).
Noel
> does [disabling the MCLK counter via DCLO, asserted by the two
> E126 monostable chain from ACLO] happen just on power-down, or on
> power-up too? I'd need to understand how that two monostable chain
> works in both cases, which I currently don't. (I only understand
>
> From: Brent Hilpert
>> ACLO is only used to trigger a 'power-failing' interrupt; CPU
>> operation is otherwise un-affected by ACLO (so the CPU can get ready).
>> DEC P/S's carefully sequence ACLO and DCLO such that on power-down,
>> ACLO is asserted first (to allow the CPU
> From: Brent Hilpert
> DCLO & ACLO behave as power-on-reset signals to the system.
Minor nit: actually, I think it's DCLO which performs that function in a lot
of places; see e.g. the latches on pg. K2 (pg. 153 of the PDF) and K7. (INIT,
usually in buffered form, is used more widely for
> From: Brent Hilpert
> So apparently I've been looking at the wrong +5V supply (H777) because
> the rest of you are indeed looking at a different +5 supply (H7140),
> both of which are in that same 11/24 pdf document
That's because the H777 is the P/S for the BA11-L 5-1/4" box,
> From: Tony Duell
> A short in FET Q15 on the bias/interface board in the PSU could do it.
> The gate of that FET is driven from an LM339 comparator the -ve supply
> of which is -15V.
Ah; I hadn't even looked at the P/S prints.
(Like I said, I'm really weak on analog: for
> From: Rob Jarratt
> I found these two signals and ACLO is low (-15V)
'Good news, bad news'...
Bad is that something is seriously wrong there; 'allowed' values are 0v
(asserted) and +3V (un-asserted). I'm worried that the -15V will have taken
out some of the semiconductors that are
> From: Murray McCullough
> One can only hope that D. Cherepanov can rebuild his museum someday
Is _he_ OK? (There are too many who aren't.)
Noel
> From: Brent Hilpert
> But the LED and CPU clock are not driven directly by that RC oscillator
> - there's a bunch of logic in-between the oscillator and the LED / CPU
> clock.
Oh, sure; it was late (for me; the dog woke me up at AM today :-), and it had
taken me a while to get
> From: "Rob Jarratt"
> Thanks for the lengthy reply.
Glad to help - or try to.
> As an aside I have also been trying to find a fault on a Pro 350 which
> uses the same CPU chipset. I have a pinout but no datasheet.
There doesn't seem to be as lot on the F-11 set. I looked in
> From: Rob Jarratt
> today I went back to it to check things a bit more carefully. All the
> power outputs of the PSU appear nominal.
> ...
> Presumably, whatever the part is, it is stopping the CPU working,
> because previously the CPU did appear to show some activity,
> From: Steven Malikoff
> I have finally got around to scanning the print set for the DEC ME11-L
> memory expansion unit
Ah, thanks for that. The prints for the boards are available, in the
PDP-11/05 Engineering Drawings (on pp. 115-137), but the MF11-L backplane was
previously
>> (I have yet to check and see if the KY11-LB asserts SACK if the CPU
>> halts on its own accord - probably 'yes', but that's a project for
tomorrow.)
Yes, it does. I toggled in the following program:
5000
5200
776
0
(what, you all can't program a PDP-11 in octal? :-) and hit
> From: Mattis Lind
> What about the M9300 board? Do you have an idea what the purpose is of
> that card?
Yes, that one's well-documented and understood.
It's intended for use on the 'B' UNIBUS of the RH11-AB, in deployment
configuratons where that UNIBUS is in use, but there's no
First, a minor correction:
> the M8264 Sack Timeout module ... there's next to nothing in print
> about them
There is also some coverage in EK-KD11E-TM-001, at: Section 4.7.2.4 "M8264
NO-SACK Timeout Module" (pg. 4-41, pg. 87 of the PDF), which I found while
looking for parity stuff
> From: Christian Gauger-Cosgrove
> From the KDJ11-E module user's guide ... the solder-side of the CD
> fingers is left unpopulated, but for the +5 and ground pins.
> The only PMI compatible option then would be the KTJ11-B UNIBUS adapter.
I forget how the -11/84-94 backplane is
> From: Rod Smallwood
> dd is a linux command.
UNIX, actually. (V5, I think:
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/source/s1/dd.c
There no 'man'page for it in V4. Anyway...)
> I only have windows PC's.
There are Windoze versions. I've used this one:
> From: Bill Gunshannon
> Just wish I could get some PMI memory for that 93.
?? The KDJ11-E in the -11/93 comes with a minimum of 2MB on the CPU card.
That's enough for almost 16 maximum-sized processes (assuming they aren't
sharing program texts - almost double that, if they are). Does
>> On Feb 19, 2022, at 10:51 AM, Noel Chiappa wrote:
>> The -11/34 (not the /34A) has something unusual for grant timeouts,
>> but I forget the details. I'll look it up.
And here it is...
> From: Fritz Mueller
> I think you are thinking of the
> From: Vincent Slyngstad
> I had to replace one of those recently
Where did you source the replacement? I need a few.
Thanks!
Noel
> Neither the KD11-E nor the KD11-EA has built-in termination and pull-ups
> ... I haven't yet checked, but it may be the only PDP-11 CPU of which
> that is true
Also the KD11-D of the -11/04.
Noel
So, I've made what I think is a significant discovery about the -11/34:
> 1B _is_ necessary, but can be provided anywhere on the bus; most
> UNIBUS/QBUS CPU [pullups] have it built in
I was wrong. Neither the KD11-E nor the KD11-EA has built-in termination and
pull-ups (those are both
> From: Jay Jaeger
> SACK turnaround capability so that the machine doesn't hang accessing
> an address that doesn't respond on the UNIBUS.
Umm, I think you're mixing up i) grant timeouts and ii) master-slave
timeouts.
All PDP-11 CPUs have master-slave timeout handling; after a
Anyone want a KK11-A:
https://www.ebay.com/itm/275173894774
US$200 sounds like a lot, I know, but KK11-A'S and FP11-A's are going for that
much; an FP11-A just went for US$250. And KK11-A's are rare; this is he first
one in a while.
Noel
> From: Rob Jarratt
> I suspect some of the other cards that were in the machine might do the
> necessary termination stuff.
Different answers for each part of the functionality.
1A and 1C fundamentally have be at the end of the bus, physically. So,
unlikely; since _other_ cards
> From: Rob Jarratt
> is the M9312 essential to ever get this machine to boot up an operating
> system?
Interesting question. I don't have my -11/24 running yet, so this reply is
theoretical, not tried in practice (and as we all know, the difference
between theory and practice is
> From: Warner Losh
> Do those chips have ROM numbers on them?
I have updated the:
https://gunkies.org/wiki/KD11-E_CPU
https://gunkies.org/wiki/KD11-EA_CPU
articles with the DEC part numbers for the i) microcode and ii) instruction
decode PROms.
That's not all the PROMs on the
>>> On Tue, Feb 8, 2022 at 6:18 PM Rod Smallwood wrote:
>>> On the M8266 CPU control board a defective 7404 (E111) has killed a
>>> bunch of the PROMs holding the microcode.
That's pretty astonishing; I've heard of PROMs dropping bits over time, but
I'm a bit amazed to hear of a
> From: Steve at oldcomputers.net
> There are some vintage tablets in Minneapolis (Eden Prarire) that would
> like, but the seller will not ship.
> Any help?
When dealing with eBaiters who can't/won't ship, I have had good luck with
PakMail (http://www.pakmail.com/); for a
https://www.ebay.com/itm/393915648077
I've already got one for my machines that take one!
Noel
> From: Tom Gardner
> You define logical disks by assigning a logical disk unit number to a
> file on a physical disk. You can then use the logical disk as though it
> were a physical disk.
To me, 'partition' implies a contiguous are of the disk; "a file" to me
implies that it
> From: Paul Koning
> When did Unix first get partitions?
'Partitions' the mechanism, or partitions the term for the mechanism?
The former appeared about V5:
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/sys/dmr/rp.c
when an RP03 was added; pre-V7, UNIX filesystems were
> From: Bob Smith
> the original UART was designed by DEC, Vince Bastiani was the project
> lead and designer, Gordon Bell was behind the project, and it may have
> been his idea.
"Computer Engineering: A DEC View of Hardware Systems Design" covers this, in
a footnote on pg. 73.
> From: Chris Zach
> Maybe that is the dhv11.
The DH11, DHV11 and DHU11 are all very similar, although not 100.00% program
compatible.
(The DHQ11 can be set to exactly emulate either the DHV11 or DHU11.) So, all
provide
DMA output, but not DMA input.
Differences with the DH11 include
> From: Paul Koning
> DH-11 is unusual in that it has DMA in both directions
McNamara's DH11? (I don't know of another DECdevice of that name.) Per:
http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf
it's DMA on
> From: Gary Oliver
> Paul - thanks for the bitsavers reference.
Ahem!
In any case, it's Al who really deserves the credit, for finding that document,
and
putting it up.
Noel
> From: Gary Oliver
> I've always thought the physical tape wound on a DECtape spool was a
> fairly conventional 'sandwich' of mylar/oxide/mylar ...
> Was there some kind of 'lubricating' coat on the data side? It makes
> sense, but none of my DEC documents or Googling has any
> From: Gavin Scott
> I think if I had a whole lot of old faded greenbar etc. ... Someone may
> even have done this already
See:
https://walden-family.com/impcode/imp-code.pdf
Someone's already done the specialist OCR to deal with faded program listings.
Noel
Speaking of FP11-A's:
https://www.ebay.com/itm/275096265379
I wouldn't mind having one, but not for that much! I wonder how much it
will go for?
Noel
> On Wed, Jan 12, 2022 at 12:16 PM Mike Katz wrote:
> I am looking to make a RX01 (and hopefully RX02) disk formatter
Something that can format floppies for the RX01 can effectively format RX02
floppies, too.
An RX02 drive can convert RX01-formatted floppies to RX02-formatted floppies.
Just ran across this:
http://wwcm.synology.me/pdf/MP00189%20FP11-A%20Field%20Maintenance%20Print%20Set.pdf
which isn't available online in this form. (This appears to be a different scan
from the one on the Maine Coon site, split up into several TIFF's, as it has
the cover which that one
> From: Chris Zach
> I'm guessing that the DD11-F is significantly different from the DD11-B?
I assume theat "DD11-F" is a typo; there is, AFAIK, no DD11-F, and a Web
search revealeddidn't turn anything up. (There are DD11-CF and -CK
backplanes, as well as -DF and -DK, but the -CF and
> an adapter cable to go from a 9-pin male (shell; female pins) to a
> 15-pin female (shell; male pins)
Sigh, shouldn't try to type when I'm this tired. Female 9-pin (to plug into
the BA11-D) to male 15-pin (for the DD11-C/D to plug into).
Noel
> From: Chris Zach
> the DD11-B is a MUD backplane
No, it's SPC; other sources, e.g.
http://www.chdickman.com/pdp11/Notes/DD11.shtml
agree.
So if you have a DD11-B, you must have a BA11-D, with the 9-pin power
plugs.
The best thing to do is get a DD11-C or -D, and build an adapter
> From: Chris Zach
> the secondary memory (a Plessy 700101-100) may be shorting the -15 line
> for some reason. Working on it, but does anyone have a manual or
> anything like that for this kind of memory board?
I've got a Plessey core memory manual somewhere, but I can't find
> From: Tom Hunter
> The original "Portable C Compiler" by S. C. Johnson (also known as
> "pcc") had functional support for the Data General Nova. Could somebody
> please point me to this original implementation?
> ...
> I am looking for the original implementation - not
> This:
> https://www.ebay.com/itm/275084268137
> ...
> Anyway I fully expect it to go ... for a _lot_ more than the opening
price.
Much to my surprise, it didn't sell at all (although a number of other lots,
likely from this machine, did.)
I'm rather puzzled that an -11/70
> From: Rob Jarratt
> Does anyone know what the correct one is?
This:
http://gunkies.org/wiki/DEC_standard_modular_regulators
has all the details.
(If anyone knows of any PDP-11 hardware or UNIX information which is not on
the CHWiki - I'm not interested in DEC PDP-11 software, but
> From: Jon Elson
> It should be 208V
Oh, right you are. It's been a long time, and I had a distinct memory that it
was less than that, but I looked, and I think that's it. The term for my
flavour of 3-phase is apparently "open wye/open delta"; each leg is 240V to
the others, but only
> From: Scott Quinn
> I have seen some roads where the utility has 2 of the phases plus
> neutral going down them, not true 2-phase power, but 2 phases 120/240
> degrees apart with the third phase just not present.
My street has that. The subdivision as a whole has all 3 phases
> From: Grant Taylor
> From that last picture, it looks like one of the plugs is five pronged,
> and looks very similar to the 120/208V 30A 3? plug in one of the
> pictures about the current 780 auction.
Not too surprising; the /780 and /785 are basically the same machine. (In
> From: Chris Zach
>> Anyone know what an M857 is? I guess it might be a DF11 async answer
>> mode?
> No, it's a single width full height M series board from the early
> 1970's.
Argh, digit swappping on my part.
The _M587_ is in the DN87 FMPS:
> From: Jonathan Chapman
> Last one that went auction-style on eBay went for $1,178.00
When was that?
Do you have any details of the machine's config?
That's a pretty good deal for a 780 (IMO).
Noel
> From: Chris Zach
> a M857 board with a RS232 cable on it and BC01R-25 on it.
Anyone know what an M857 is? I guess it might be a DF11 async answer mode? I
found this:
https://www.computerhistory.org/collections/catalog/102731577
but I think the number there is wrong; I'm not sure
This:
https://www.ebay.com/itm/275084268137
The starting price is expensive, but probably not utterly unreasonable,
given that:
- the 780 was the first VAX, and thus historically important
- 780's are incredibly rare; this is the first one I recall seeing for sale
in the classic computer
This guy:
https://www.ebay.com/sch/m.html?_ssn=jariadkin-0&_sop=10
has a couple of PDP-8 boards for sale that at the moment are going _really_
cheap.
Noel
> From: Tony Duell
> I have _two_. But alas nothing to connect them to.
Well, there are still a good flock of machines with IBM channels around, but
_you_ don't have one (I can't blame you :-). I wonder if any of the people
with IBM channel machines have any need to connect to an -11?
> From: Steven Malikoff
> Was there ever an indicator panel for the RC11? .. I have a set of RC11
> modules .. No backplane though. I've not found any docs for these, I
suppose
> they're probably on bitsavers and have overlooked them.
Looking at the manual and engineering
> From: Jay Jaeger
> Also, if someone (else, presumably) does up a replica of the indicator
> panel board (perhaps with the option to use LEDs, with some resistor
> packs that could be bypassed for lamps
Two points.
First,there's the question 'are you trying to produce
> From: Rod Smallwood
> Let me see what artwork I have
I'm curious as to what you'd be able to find. Like I said, I'm pretty sure
DEC never did an RK11-C inlay; the engineering drawings for the 19" indicator
panel (included in the RF11 engineering drawings:
> From: Marc Howard
> I've got an 11/40 I'm going to start working on. Problem is that there
> are two power supplies (H742 and H7420) that came with it but neither
> was mounted in the rack.
-11/40's in general only have one of those large H742x suppplies in a rack.
The
Let me get this out before the list gets shut down _again_...
There is discussion of doing a run of indicator panel inlays:
http://ana-3.lcs.mit.edu/~jnc/tech/DECIndicatorPanels.html
for the RK11-C (which is wired for an indicator panel, although as far as
I know, DEC never did the inlay).
Can we please return to discussions of actual classic computers, before our
long-suffering list host shuts the list down _again_ for this sort of
argument, this time perhaps forever? Thank you.
Noel
> From: Guy Sotomayor
> I don't unfortunately have any light masks
Dave Bridgham and I were manoeuvreing to be able to produce clones of the one
you loaned me (he has access to a computer-controlled milling machine at his
maker-space or whatever the name is for them now, and we bought a
> From the blog of someone who got a KB11-A working
It's Fritz Mueller's blog; at about the top of this page:
https://fritzm.github.io/category/pdp-116.html
he's just turned the machine on for the first time, and you can
follow as he chases, finds and fixes CPU problems. The KB11-C/D
of
> From: Ed Cross
> I'm currently restoring a PDP-11/70 system and need the following
> boards to complete the CPU: FP11-C
>From your mention of the FP11-C, I gather your -11/70 has a KB11-C (later)
CPU, not the KB11-B CPU of the earlier PDP-11/70's (prior to 1976 - the
difference
> From: Adrian Stoness
> [M?]iror everything guys make copies and stash
> From: Paul Koning
> The web can make things perpetual if they are stored redundantly ...
> But anything centralized is just as vulnerable as any centralized copy
> ever was, whether from risk of
> rom: Paul Koning
> WD-40 is a good solvent to use for adhesives stuck to plastic. It's
> unlikely to hurt the plastic but it will soften the glue.
My go-to solvent for non-ionized glue residues (use water for ionized) on all
sorts of materials has been, for many years, mineral
> From: Nigel Johnson Ham
> an 11/23 will not work without bank zero memory
It depends on what you mean by 'work'. If you mean 'ODT does not operate
correctly', or 'the CPU won't run', I can assure you that neither of those
is correct.
Here is a recorded log from a session earlier today
> From: Nigel Johnson
> I will wait with bated breath!
First things first; did you get either/both CPU's running ODT OK
in a system containing just i) the CPU card and ii) the console
serial interface?
Noel
A couple of comments on a number of things touched on in this thread:
> From: Nigel Johnson Ham
> Ah, well there you see the end of my technical knowledge.
My observation is that since varying QBUS PDP-11 CPU's can be swapped in and
out (unlike UNIBUS PDP-11's, where the CPU's backplane
> From: Tony Duell
> Were there 2 things called the KM11?
> The KM11 that I know is the maintenance unit
> From: Paul Birkel
> I think that we're all talking about the ML11-A, or at least are
> intending to ... although the Subject line has been erroneous from the
>
> From: Paul Koning
> But the sector format is a different matter. If it's designed for
> PDP-11 and friends, presumably it has a 512 byte sector size. For
> PDP-10 or -20 use you'd presumably want a sector size consisting of
> some round number of 36 bit words.
Actually, the
> From: Mark Kahrs
There's a typo in your original Subject: line: the KL11 is a very early UNIBUS
(probably the very first UNIBUS device ever, looking at the board's Mxxx
number) asyn serial line interface:
https://gunkies.org/wiki/KL11_asynchronous_serial_line_interface
> manx tells
> From: Bill Degnan
> Was there a UNIBUS storage system that used a cassette player as the
> storage device .., rigged to send receive signals via a serial card
> connection.
Yes and no. There is the TA11 Magnetic Tape Cassette System, which used the
TU60 Dual DECasette
> From: Jay Jaeger
> BTW, I have only the sales brochure for the DM11, near as I can tell.
> 114X-00871-1715/J . If you want me to drag the box of sales lit from
> the garage, and scan it, me know - could do it next week.
No major need for it; I found the DM11-AA Tech Manual in
> From: Jay Jaeger
> ROTFL - especially given the earlier case, and since Noel knows about
> you folks quite well..
The joke's actually on you:
DQ11_RevL_Engineering_Drawings_Aug75.pdf 2021-08-09 14:05
I'd
> From: Al Kossow
> Date: Mon Aug 9 14:05:07 CDT 2021
Wow! That was _amazing_ speed, to get that uploaded so quickly (even if you
had already scanned it in), considering I only posted my request at 14:32 EDT!
Thank you very, very much: that allowed me to complete the DQ11 page on the
Anyone have a set of DQ11 prints? The DQ11 MM is missing some important
info, which is apparently only on the prints.
Noel
> From: Chris Zach
> The older Vaxes had linear power supplies if I recall up to the time
> of the Decsystem/2020 (when they went switching at last)
Really? The H742 power supply:
https://gunkies.org/wiki/H742_Power_Supply
(well, technically, the associated 'bricks', such as the
Hey, anyone need a KI10/KL10 I/O Bus terminator:
https://gunkies.org/wiki/File:KIKLIOBusTerm.jpg
(H867)? Since I don't have either a KI10 or a KL10, I'm unlikely to ever have
a need/use for this one! :-)
Noel
> From: Tom Uban
> it has the early version M7261E Control Logic & Microprogram board and
> the later version M7260 Data Paths board
Ah, I'm glad someone found all that stuff I wrote up there useful. As always,
I _think_ I got it all transcribed correctly, but do be on the lookout
So, I have images of two different pieces of DEC documentation for the H960
series of racks/cabinets (the H950 is the bare rack; the H960 is the rack
complete with various appurtenances such as side panel, stabilizer feet,
etc). I had a request for them, so I've put them online. They are:
> From: Lars Brinkhoff
> Chris Zach wrote:
>> I'll drop by and see which CHAOSNet card it has.
> It may have been removed when we worked on getting ITS booted.
For a long time AI used a UNIBUS CHAOSNet card, plugged into an -11 connected
up to AI via the Rubin 10-11 interface.
> From: Barry M
> H960 120 lbs (not sure if this includes the side panels)
The H960 has a whole constellation of appurtenances which can add to the
weight: sides, back door, back mounting frame, top fan(s), floor screen,
stabilizer feet, etc, etc.
I happen to have an empty H960 (well,
> Is there a controller to attach an RS64 disk to a PDP-8? The only
> controller for the RS64 I can find is the UNIBUS RC11. Thanks.
I never saw any reply, so I gather the answer is 'no'. I looked through the
stuff on BitSavers for a bunch of other machines (IIRC, PDP-9 and PDP-12
and
Is there a controller to attach an RS64 disk to a PDP-8? The only controller
for the RS64I can find is the UNIBUS RC11. Thanks.
Noel
> From: Eric Smith
> The KB11-B (original 11/70) and KB11-C (later 11/70) have essentially
> the same changes as from the KB11-A to KB11-D
Speaking of which, two of the boards that are different in the KB11-D, from
the -A, are _identical_ to boards in the KB11-C - the M8123 ROM & ROM
> From: Henk Gooijen
> I have the M8120 and 4 M8121 boards (32kW bipolar RAM). It is a bit
> weird, but in the 11/55 are also two G114 boards (4kW MOS RAM), IIRC.
G114s? Those are the sense/inhibit module from the MM11-U/MJ11. Did you
mean G401s?
If so, one guess as to what
> I had a look at my /45 ... and it seems to ... look just like those on
> Josh's. I'd really want to take pictures of mine .. so I can compare
> them directly, though, not depend on visual memory.
Yeah, mine (a late /55, actually) has the _exact_ same wires at Josh's.
So that's
> From: Fritz Mueller
> could I ask that you take some closeups around the Mate-n-Locks along
> the top? I'd be very interested to see the board traces and the details
> of the red bus wiring there.
I had a look at my /45 (a later KB11-D - although I think the backplanes for
the
> From: From: Fritz Mueller
> two solutions come to mind -- the one you mention here with nut and
> washer, or inserting a hex-head machine screw in the other direction.
> Either the nut or the hex-head screw could then be secured with a small
> combination wrench.
Well, if
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