> On Feb 19, 2022, at 10:51 AM, Noel Chiappa via cctalk
> wrote:
> The -11/34 (not the /34A) has something unusual for grant timeouts, but I
> forget the details. I'll look it up.
I just did an 11/34 restoration last year, so this is fresh in mind — I think
you are thinking of the M9302, Noe
> On Feb 19, 2022, at 10:51 AM, Noel Chiappa via cctalk
> wrote:
> The -11/34 (not the /34A) has something unusual for grant timeouts, but I
> forget the details. I'll look it up.
> On Feb 19, 2022, at 12:11 PM, Fritz Mueller wrote:
> I just did an 11/34 restoration last year, so this is fresh
Hi folks,
I’ve begun some work on a VT52, and need to get the power supply board out onto
my bench for some work. For those who have been in here before: is there a way
to detach the HV anode lead at the board side (does the white “cap” come off
the lead connector?) Or is the only option to u
> On Feb 20, 2022, at 10:27 PM, Fritz Mueller wrote:
> I’ve begun some work on a VT52 ... is there a way to detach the HV anode lead
> at the board side (does the white “cap” come off the lead connector?)
Well, just answered my own question — went back and tried to be a little more
assertive,
So, having pulled the CRT now , I was surprised to see that the ground braids
seem to be held against the aquadag by only the pressure from a couple foam
blocks! In my unit these aged foams are deformed and brittle. This would
seem a good thing to add to the check list for looking at these…
>> From: Fritz Mueller
>> I think you are thinking of the M9302, Noel: a far-side terminator card
>> with integrated SACK turnaround?
> On Feb 21, 2022, at 7:19 AM, Noel Chiappa via cctalk
> wrote:
> No; the M8264 Sack Timeout module. What's an M8264, you say? ...
Ah, quite interesting, didn’t
> On Feb 21, 2022, at 10:29 AM, Fritz Mueller wrote:
> Also, in taking a look this morning at the M9302 schematic around page 70 in
> the commonly available 11/34 engineering drawings set (rev B, Sep 76), there
> appears to be a mistake! The output of the SACK turnaround circuit is
> annota
> On Feb 24, 2022, at 8:24 PM, Noel Chiappa via cctalk
> wrote:
> … at first I thought that maybe you were thinking of the M7850 Parity
> Controller (which is
> actually a memory option, not KD11-E/EA specific; more below), but that's a
> dual card.
Yes, I was thinking of the M7850, but I had
> On Feb 26, 2022, at 2:19 AM, Noel Chiappa via cctalk
> wrote:
> So, either (console halt, or a HALT instruction) will cause the identical
> response in the processor; see Section 4.10.3 "Halt Grant Requests": the CPU
> sends HLT GRANT to the console, which returns SACK. As long as SACK is
> a
> On Sat, Jul 30, 2022 at 10:23 PM Ali via cctalk wrote:
> So I am wondering if there is a box that provides a telnet CLIENT to a
> serial port device? I.E. a box smart enough that handles the telnet client,
> LAN functions, and terminal emulations internally and then provides a text
> based in
> On Oct 19, 2022, at 6:16 AM, Paul Koning via cctalk
> wrote:
> ...a couple of years ago I wrote an article about the invention of FM radio,
> in Holland in 1919 (no, not by Armstrong in the USA in the late 1920s).
That sounds interesting, Paul — I’m only familiar with the usual USA-centric
> On Dec 21, 2022, at 7:16 PM, Steve Malikoff via cctalk
> wrote:
>
> For a DLV11 EIA serial connection, I am about to wire up a fly lead cable to
> go from an M7940 SLU (no dash version) 40-pin header to a DB25P … I could use
> any colours but I'd really like to use the original colours for
Hi folks,
I’ve been picking my way through a PDP-8/L restoration lately. I’ve found that
everything in the machine is covered with a uniform layer of dark “soot”
(enough to blacken your hands while working with it) which I would like to
clean up. Perhaps the “soot” is actually from a decompos
> On Jan 5, 2017, at 8:48 AM, Rick Bensene wrote:
>
> The method I've used very successfully for unknown packs is:
>
> 1) I first mount the pack in a drive that has a good absolute filter,
> and has had the head load disabled, and spin it for a few hours.
I’m getting to the point in my RK05 re
> On Apr 1, 2017, at 2:53 PM, Marc Howard wrote:
>
> BTW, have you replaced the emergency head retract batteries and/or allowed
> them to reach full charge?
Yes, have done replacement. Haven’t put a charge on them yet, but figured
running the drive for a couple hours with disabled head load
The first two packs I opened up for cleaning had foam around the inside of the
hub. If it is decaying like the rest of the foam DEC used this seems like it
could be a problem inside the packs?
I haven’t seen this discussed before in any of the RK05 pack cleaning threads.
Do folks usually leav
Hi folks,
An M9301-YB bootstrap terminator that I’ve been using during the restoration of
a PDP-11/45, which has previously worked fine, now seems to be failing on me.
Examining the contents from the front panel I see a few words with different
values than the ones that Noel has listed in his
Hi folks, thanks for all the help!
> On Jul 4, 2017, at 8:34 AM, Noel Chiappa via cctalk
> wrote:
>
>> I see a few words with different values than the ones that Noel has
>> listed in his partial M9301-YB disassembly.
>
> Any chance you could send in some of the differences? I can take a look
Well, the situation had worsened on my M9301 to the point where every single
word was affected, and then it was easy to see that it was always in the
least-significant four bits. So I pulled and reseated that PROM, then went
ahead and did the other three as well for good measure (really should
Hi folks,
I'm in need of cabling and a distribution panel for a DEC DZ11 serial mux that
I'd like to put in a PDP-11/45. Before I embark on building something up from
scratch I thought I'd ping here and see if anybody had all or part of this on
hand and would be willing to work out a deal? Hi
> On Jul 22, 2017, at 3:42 PM, John Wilson via cctalk
> wrote:
>
> I don't have anything to spare, but you need to say whether you mean
> DZ11A (EIA) or DZ11C (20 mA) before anyone can hook you up, since
> they're entirely different cab kits.
Oh, yes -- I mean the DZ11A (EIA). Sorry I forgot t
> On Jul 23, 2017, at 9:04 AM, Noel Chiappa via cctalk
> wrote:
>
> Here ya go:
>
> http://www.ebay.com/itm/321225351590
Oh, great -- thanks! I'll make an offer on one of those.
I'd still like to keep an eye out for an H317-E, since my /45 is in H960 19"
racks, but this will help to get
Update: have now tracked down an H317-E, from a list-member. Thanks, all!
Hey folks:
As some of you know, I've recently restored a PDP-11/45, RK11-C drive
controller, and an RK05 drive. I'm now at the point where I'm working to
recover and archive the contents of the dozen or so RK05 packs that I got along
with the drive and controller.
I've been inspecting and cle
Thanks for the advice, per usual, folks!
To answer the question of "where hard to see", I guess it's really an issue of
my old-man-eyes at this point. I find I need to use a jeweler's headset, or
even bench microscope, to really see anything small in detail these days. It's
hard to do that wi
Thanks for the advice, per usual, folks!
To answer the question of "where hard to see", I guess it's really an issue of
my old-man-eyes at this point. I find I need to use a jeweler's headset, or
even bench microscope, to really see anything small in detail these days. It's
hard to do that wi
> On Jul 24, 2017, at 2:25 PM, Noel Chiappa via cctalk
> wrote:
>
> http://gunkies.org/wiki/File:RK05Head.jpg
> http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/RK05HeadRefl.jpg
Thanks, Noel, that's very helpful! A recent picture of the upper head in my
drive:
http://www.slac.stanford.edu/~f
So, I have lately been using PDP11GUI to retrieve images of RK05 disk packs and
to write images to these packs on a PDP-11. This is awesome, but its a bit
frustrating that it takes a couple hours to read or write an image this way.
I do, however, have a couple of DR11-C parallel interface cards
> On Jul 31, 2017, at 8:19 AM, Jay Jaeger wrote:
>
> I have Ethernet shield for my Arduino Uno, and I use that and a simple
> (in my case, perl, program to talk to the final destination device. I
> have two cables, one for each direction, from the DR11-C (not using DMA)
> to the Arduino.
Awes
> On Jul 31, 2017, at 11:30 AM, Bill Gunshannon via cctalk
> wrote:
>
> Well, I'm confused now. What do 16 bit paralel and ethernet have to do with
> each other?
Nothing, directly; confusion created by poor quoting on my part, probably! The
goal is a higher-bandwidth and higher-convenience
On 07/31/2017 12:15 PM, Don North wrote:
Arduino UNO (the 'original') and the Mega2560 big brother both use 5V
I/O microprocessors, so all the I/O is directly 5V capable.
Awesome, that seems like the way to go, then -- just need to bodge the
appropriate cables. I'll check it out!
--FritzM
On 08/01/2017 10:16 AM, Al Kossow via cctalk wrote:
Another stillborn project?
I don't see any software to make the Beaglebone talk Unibus
Yes, this one has been around for a couple years now but sadly doesn't
seem to have progressed...
On 08/01/2017 01:23 PM, Jay Jaeger wrote:
I have posted my code (and pinouts) on Google Drive at:
https://drive.google.com/open?id=0B2v4WRwISEQRUUxuNGhZRENvYjQ
Thanks, Jay -- I'll check it out!
Mattis: I *do* have a DELUA, actually, but haven't slotted it yet to
check it out. Your suggest
On 08/01/2017 05:27 PM, Jerry Weiss wrote:
If you install the DELUA, don’t forget there is TCP/IP support for RT11
from Alan Baldwin at http://shop-pdp.net/rthtml/tcpip.htm.
Hi Jerry -- I had seen the RT-11 TCP/IP stuff, but my 11/45 can only
address 256K of memory, so doesn't meet the minimum
> On Aug 1, 2017, at 7:37 PM, Jerry Weiss wrote:
>
> It is possible to install the TCP/IP Package on a 248K
> machine using the DEUNA/DELUA 18-bit (Non Unibus Map-
> ping) EU18XM.SYS handler.
Thanks Jerry, I'll check that out. Might also be a bit of work to
On 08/17/2017 12:54 PM, Noel Chiappa via cctalk wrote:
Anyone out there have an LA30? :-)
For future reference, I am also working on an LA30 at the moment. I
think Mattis has restored one as well?
Mine is a P, and I have the matching M7910 to go with it, so no need for
an M7389 here (sound
> On Aug 19, 2017, at 10:10 PM, Mattis Lind wrote:
>
> BTW. I have LC11 manual and drawings. But they are for the older M791. At
> least a bit helpful. Not scanned yet.
I'd be very interested to see those once scanned. I haven't gotten to the
interface card yet; so far I've just been working
Hi folks,
I'm picking my way through an LA30 restoration right now. It was pretty
filthy, so I've needed to pretty thoroughly disassemble it for proper
cleaning.
I noticed that a few of the thin steel ribbon springs in the paper path
are missing or broken on my unit, and some of the rubber
Hi all, an update on the sourcing questions below:
> On Nov 11, 2017, at 5:53 PM, Fritz Mueller wrote:
>
> I noticed that a few of the thin steel ribbon springs in the paper path are
> missing or broken on my unit, and some of the rubber bushings have hardened
> and deteriorated. Long shot as
Got the last replacement components I needed for my LA30 restore today,
and finished it up! Here's a short video of the LA30 connected as
console to my restored PDP-11/45:
https://www.youtube.com/watch?v=gMIL2bvUYIs
Hi Henk,
On 12/10/2017 04:08 AM, Henk Gooijen wrote:
One question: where did you find paper for this printer.
It is not a “standard” format …
I have about a third of a box of paper that came with the LA30 when I
picked it up from surplus many years ago.
I've ordered a new box of paper from
Hi Mattis,
> On Dec 23, 2017, at 12:08 AM, Mattis Lind via cctalk
> wrote:
>
> Anyhow, the VT52 boards are dead. … The terminal uses 4 pieces
> of 256 by 4 bipolar PROMs for a total of 512 bytes of microprogram.
> Has anyone dumped the contents of these so I could verify them?
I have a restore
The most documentation I’ve seen re. the PROMs is pages A-1 and A-2 of the VT52
maintenance manual here:
http://www.pdp8.net/pdp8cgi/query_docs/tifftopdf.pl/pdp8docs/ek-vt52-mm-002.pdf
I think you’ve probably seen that already. I’ll post more info from my VT52
later when I make it downstairs t
> On Sep 6, 2023, at 10:08 AM, Paul Koning via cctalk
> wrote:
> "On what model and under what circumstances will the PC increment by 1?"
At least true on a KD11-B when executing code out of the memory-mapped register
file :-)
(I just happen to have been wading through one of these a couple
> On Sep 6, 2023, at 12:48 PM, Paul Koning via cctalk
> wrote:
>
> The weird case of the 11/05 is because the general registers are assigned
> addresses 177700 through 177707 for R0 through PC, so R1 is at 177701 even
> though it's a word wide. On most models those addresses only work from
Hi folks,
I’m working on a vt220 debug/repair and have gotten to the point where I need
to trace firmware execution at boot. I’ve managed to dump the proms (close to
but slightly different from the versions in Lars’ GitHub) and the 8051 internal
rom, and can load and disassemble these with the
> On Jan 29, 2024, at 9:54 AM, William Sudbrink via cctalk
> wrote:
> ...the anode cap on the leaking CRT had gone rock hard and there was a small
> "streak" on the back of the CRT that looked like the plastic that it was made
> of had released some sort of oil…
Often times dielectric grease
So, I recently salvaged a pair of ASR 33s and a PDP-8/I from a research lab
where I work. A few folks chimed in on the "anybody want this" thread, but I
happened to be the lucky winner (not lucky for my back or my basement, but they
will be fun restoration projects.)
One of the engineers here
> On 6/12/2024 8:28 PM, mark audacity romberg via cctalk wrote:
> Yeah, something’s missing here, teletype paper is for sure not good as a
> dummy load.
Sounded pretty strange to me, but the commenter is a fairly accomplished person
in the accelerator electronics and detector division, and the
Hi all,
Some here may know I’ve been working on an 11/45 restoration off and on for
some time now. My ’45 currently has floating point, KT11-C mem mgmt, 124 kword
MS11-L, and an RK11-C with one restored RK05 drive.
Last week I decided to see if I could bring up RSTS/E on the machine. I managed
> On Dec 31, 2018, at 1:54 PM, Paul Koning wrote:
>
> The standard idle pattern is in the data lights. I don't remember if the
> "fancy" pattern appeared in V7.0 or earlier, but in any case it's an
> undocumented SYSGEN option.
>
> In RSTS/E, the display register shows the system error coun
> On Dec 31, 2018, at 5:15 PM, Paul Koning wrote:
>
>> On Dec 31, 2018, at 6:32 PM, Henk Gooijen via cctalk
>> wrote:
>>
>> There are one or two bits in a register of the RK11 that have a different
>> meaning/function, depending on the controller being a -C or -D. The RK11-C
>> was quickly
> On Dec 31, 2018, at 8:43 PM, Noel Chiappa via cctalk
> wrote:
>
> In the RKDS: bit 7 has changed the definition slightly ("Drive Ready" to
> "R/W/S Ready"), but seems to be basically the same. In the RKCS, bit 9 is
> "Read/Write All" in the -C, and unused in the -D; bit 12 is "Maint" in the
> On Jan 1, 2019, at 5:10 PM, Paul Koning via cctalk
> wrote:
>
> You could load monitor ODT (ODT option in the memory layout settings in
> DEFAULT) and set a breakpoint at LOG$DK, that's the error logging entry point
> of the driver. Then you could display the RK11 CSRs and we can see if w
Hi Paul,
> On Jan 3, 2019, at 7:01 AM, Paul Koning wrote:
>
> I have a Monitor ODT manual from RSTS V4, I should find a way to make that
> available. It's pretty nearly standard ODT, there are a few extensions for
> mapping addresses
Bitsavers has some docs for ODT from contemporaneous versi
> On Jan 3, 2019, at 5:17 PM, Paul Koning wrote:
>
> So in this example, 55230 is the error logging entry point for the RK11
> driver. ... If you have a breakpoint at this location, you'll be able to
> capture the controller CSR contents which -- I hope -- will explain why the
> system is no
> On Jan 4, 2019, at 6:51 AM, Paul Koning wrote:
>
> Plan B: set a breakpoint at "ERL" (040672 in your map) which is the entry
> point to the error logging code. That's where the display register is
> incremented as part of logging an error. On entry, R0 is the EMT code (a
> LOG$xx code, b
> On Jan 4, 2019, at 5:15 PM, Paul Koning wrote:
>
> So the likely answer is that either your INIT.BAC program, or your BASIC.RTS,
> is damaged ...
> Can you read the RK05 from the machinery you used to fill it originally? It
> might make sense simply to read parts of it, or all of it, and v
> On Jan 4, 2019, at 5:15 PM, Paul Koning wrote:
>
> So the likely answer is that either your INIT.BAC program, or your BASIC.RTS,
> is damaged ...
> Can you read the RK05 from the machinery you used to fill it originally? It
> might make sense simply to read parts of it, or all of it, and v
> On Jan 5, 2019, at 8:07 AM, Noel Chiappa via cctalk
> wrote:
>
>> From: Fritz Mueller
>> All the CPU, FPU, KT11, KW11, and RK11 MAINDECS are passing just fine.
>
> Don't forget Vonada Maxim #12:
> "Diagnostics are highly efficient in finding solved problems.”
Well, there’s wisdom there, f
> On Jan 5, 2019, at 3:35 PM, Noel Chiappa via cctalk
> wrote:
>
> The only difference I can see (I compared page by page, to see if each page
> had the same microinstructions on it) is that on sheet 17; the last
> microinstruction for RTI/RTT has been moved from 002 -> 744. (The actual
> micr
Hi Jerry,
> On Jan 5, 2019, at 4:06 PM, Jerry Weiss wrote:
>
> Along those lines if you have a spare disk pack, try putting RT11(FB,XM) on
> the machine and give it a workout. This would exercise the machine a bit
> more than MAINDECS, though not as much as RSTS.
Yup, I have previously ha
> On Jan 5, 2019, at 9:17 PM, Tony Duell wrote:
>
> On Sun, Jan 6, 2019 at 12:45 AM Fritz Mueller via cctalk
>
>> Easy enough experiment to try; would need to re-jumper the G740 disk
>> selection flip chip in the RK11-C too, I guess?
>
> No. One difference be
> On Jan 5, 2019, at 9:51 PM, Tony Duell wrote:
>
> Actually, is there a good reason not to fit all jumpers on that board?
Looking at it, I was just wondering the same thing!
> On Jan 5, 2019, at 12:58 PM, Fritz Mueller wrote:
>
> I did get some MACRO CRC-16 sub-routines coded up last night while waiting
> for various transfers, so I think I’ll go ahead and finish up the standalone
> CRC dumper utility today.
>
> Lastly, a 5V-tolerant USB FIFO breakout board is s
Oh, one last thing: if anybody else out there has a real working '11/45 + RK05
and wants to try this RSTS image, let me know, and I’ll send you a copy (all
2.5MB of it, hah). It’d be interesting to see if this a really just limited to
my machine?
--FritzM.
Hi Paul,
> On Jan 6, 2019, at 5:58 PM, Paul Koning wrote:
>
> Hm. Can you read data back from the RK05 pack? I'd have to refresh my
> memory on how but it's clearly possible to force a crash dump. That would
> allow us to dig into exactly what went wrong, provided you can read the dump
> f
> On Jan 7, 2019, at 6:29 AM, Noel Chiappa via cctalk
> wrote:
>
> Try running your RSTS image on Ersatz-11, see if it's a simulator issue.
I’ll give that a go.
> And try bringing up Unix V6 on your machine ... I can help with providing the
> image, if needed.
I’ve thought about that; Unix
Hi Paul,
> On Jan 7, 2019, at 7:40 AM, Paul Koning wrote:
>
>> On Jan 6, 2019, at 5:58 PM, Paul Koning wrote:
>>
>> I'd have to refresh my memory on how but it's clearly possible to force a
>> crash dump. That would allow us to dig into exactly what went wrong,
>> provided you can read the
> On Jan 7, 2019, at 12:56 PM, Noel Chiappa via cctalk
> wrote:
>
> ...there are single-RK05 images up already:
>
> http://www.tuhs.org/Archive/PDP-11/Distributions/research/Ken_Wellsch_v6/
>
> but they only include binary for /40’s ... but really, it's drop-dead simple
> to build a /45 ve
> On Jan 7, 2019, at 12:56 PM, Noel Chiappa via cctalk
> wrote:
>
> Well, there are single-RK05 images up already:
>
> http://www.tuhs.org/Archive/PDP-11/Distributions/research/Ken_Wellsch_v6/
Hmm, this link didn’t work for me; I found I think equivalent mirrored at:
https://www.tuhs.o
> On Jan 7, 2019, at 10:02 PM, Fritz Mueller wrote:
>
>> On Jan 7, 2019, at 12:56 PM, Noel Chiappa via cctalk
>> wrote:
>>
>> Well, there are single-RK05 images up already:
>>
>> http://www.tuhs.org/Archive/PDP-11/Distributions/research/Ken_Wellsch_v6/
>
> ...which directory contains sever
> On Jan 8, 2019, at 9:23 AM, Noel Chiappa via cctalk
> wrote:
>
> ... Dave B and I need a PDP-11 in the FPGA on the QSIC, to run the USB
> protocol on; rather than using a microcontroller, we decided the hack value
> of putting an -11 in there was too much to resist.
Fun! I should go read
Update from last night:
I did manage to build a bootable single-RK05 V6 unix image under SIMH, starting
from the Ken Wellsch tape image. Yeah, it needs to be converted to SIMH tape
format, as documented in various places on the web, including actually a
gunkies page that I didn’t notice until
On 1/8/19 1:53 PM, Noel Chiappa via cctalk wrote:
Can PDP11GUI save output from the -11's console? If so, just say 'od core',
and send me the output.
Assuming that doesn't create another core file... :-) I'll give it a go
when I get home tonight.
--FritzM.
They need to tune the pitch to the audience:
"We see that you ran 'EDITH' with three sense switches activated..."
On 1/8/19 3:07 PM, Noel Chiappa via cctalk wrote:
:-) Don't worry, we'll nail it!
Oh yes, it would be much less fun if it were all working. The finding
and fixing is the best part :-)
Rest up and feel better soon, Noel!
--FritzM.
Hey Noel,
Did get away with ‘od’ without generating a second core file — sending to you
in direct messsage!
Also found and ran the appropriate MS11 MAINDEC that matches the vintage of my
MS11-L board (a bit of an anachronism for an '11/45) and it is indeed
indicating some sort of issue now, so
Hi John -- I could really use a few more 12-sector RK05 packs, and would
happily pay for shipping plus whatever small "inconvenience fee" seems
reasonable to you?
If you have nothing to pack them in, I could ship you a some materials
as well?
I have almost no media to use on my recently rest
[oops, meant that to be a DM, sorry all, Linux mailer was being tricky
with the "To:" address :-/]
So, one of the things I have along with my 11/45 is an RK05 alignment
cartridge. Unfortunately, its seems warped -- rides up an down a few
millimeters in each direction as you turn it in an RK05 drive. :-(
Is there any hope for bending one of these platters back more into true
(maybe using a
> On Jan 10, 2019, at 12:47 AM, Christian Corti via cctalk
> wrote:
>
> I don't think it's the platter but perhaps a dirty hub ring or centering
> cone. Try cleaning the ring and the cone of your disk pack.
Ah, thanks — I’ll take a look!
> On Jan 10, 2019, at 11:23 AM, Al Kossow via cctalk
> wrote:
>
> http://rescue1130.blogspot.com/2017/11/resolved-copy-and-burn-of-264x-terminal.html
Oh, thanks — I’ll check that out as well!
I think I see an H960 with a couple DEC half panels stuck on it peeking out of
the very back there...
> If the half panels are for sale, I'll take them! :-)
They’d nicely compliment or house those new QSIC indicator panels you’ve been
working up, huh? :-)
Got to work on this problem a little more this weekend. Worked up some simple
standalone diagnostics to map and test all the memory on my 256K MS11-P. Sure
enough, I’m seeing some stuck bits at various addresses in physical address
range 70-75.
Need to clean up the diagnostics a bit a
> On Jan 14, 2019, at 9:25 AM, Noel Chiappa via cctalk
> wrote:
>
> Is it really an MS11-P?
Nope, I fat-fingered that! It’s a 256KB MS11-L.
--FritzM.
Happy weekend, all! Latest updates on this issue:
Identified and replaced a faulty 4116 DRAM (E204) on my MS11-L. After this, my
small hand-rolled standalone diagnostic passes the full 256K. I'll post my
diagnostic source over on my blog soon.
After this repair, tried MAINDEC ZQMC, called ou
Thanks, Paul and Noel, for the detailed responses per usual!
> On Jan 20, 2019, at 6:55 AM, Noel Chiappa wrote:
>
> What is [MAINDEC ZQMC] complaining about?
Looks like a few more flaky bits in a couple of additional banks. For those
reading along who may be unfamiliar with the MS11-L, it is
Some further info on the parity halt/trap thing:
Digging again this morning for what I saw yesterday, it does look like it's a
MS11 fastbus thing. The EHA/EHB bits are described in the Jan 1973 version of
the 11/45 MS11 maintenance manual (table 3-12, describing the parity register),
but they
Further archeology has led me to the "PDP-11/45, 11/50 MOS Memory
Troublshooting Guide", the cover letter of which is quite amusing:
"...COMPANY CONFIDENTIAL, that is take [this guide] on site but do not let the
customer read it."
"Please do not send these to the Depot for repair!! Instead sen
> On Jan 21, 2019, at 8:35 AM, Noel Chiappa wrote:
>
>> Even better, it claims to be able to control whether the memory uses odd
>> or even parity! (How, for UNIBUS memory, I don't know - there's no way to do
>> this over the UNIBUS.
>
> So this really confused me... The answer is...
Super i
> On Jan 23, 2019, at 2:37 PM, Noel Chiappa via cctalk
> wrote:
>
> In response to a request a couple of years back from Cindy, I've been slowly
> working on a page to help scrappers identify PDP-11's, and give them an idea
> what to look for. I have it _mostly_ done...
Hey, now -- those PDP-
> On Jan 20, 2019, at 7:11 PM, Will Cooke via cctalk
> wrote:
>
> Jack Ganssle wrote a couple of articles about memory testing and failure
> modes...
> http://www.ganssle.com/articles/aramrom.htm
> http://www.ganssle.com/articles/ramtest.htm
Thanks for the pointers, Will; I found the article
> On Jan 27, 2019, at 1:34 PM, Paul Koning wrote:
>
> I have the impression that RSTS tries to identify the parity CSRs by forcing
> wrong parity and seeing which CSR reports the issue. So if you have a CPU
> ECO issue that causes trap to 114 not to work, I don't see how you could get
> RST
Those reading through the recent "PDP-11/45 RSTS/E boot problem" thread here
will know that I've gotten to some corners of my 11/45 CPU now that don't match
up with the commonly available engineering drawings.
My /45 is an early serial number (#152). So far I've verified hardware
differences o
> On Jan 27, 2019, at 3:06 PM, Fritz Mueller wrote:
>
> I'll keep you posted about what I find out from ANALYS!
Posted below. I've elided the core dump here so not to spam everybody; will
send off-list.
Note that I only copied over the blocks of [0,1]CRASH.SYS, and overlaid them on
a copy
Hi Jay,
> On Jan 27, 2019, at 7:07 PM, Jay Jaeger wrote:
>
> I think I can help some... I DO have earlier PDP-11/45 CPU drawings...
Man, this list is the absolute best!
The '72 KB11-A drawings would be most immediately useful. If you only have
time for a subset of pages, I would find the sch
> On Jan 28, 2019, at 7:06 AM, Paul Koning wrote:
>
> So you do need the correct SIL file. As-built should be sufficient (I don't
> believe it cares about the defaults, so the stuff INIT saves into the DEFALT
> section of the monitor SIL should not be needed).
Well, it *should* be the same
> On Jan 29, 2019, at 1:46 PM, Jay Jaeger wrote:
>
> Dang it - the dates fooled me. (blush) Sorry to get your hopes up,
> Fritz.
Oh, darn! Well, thanks anyway for taking a look. And so the search
continues...
The later revisions and other docs are still quite a nice find, and it would
cer
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