Re: early PDP-11/45 info sought

> On Jan 28, 2019, at 8:26 AM, Noel Chiappa via cctalk > wrote: > > E.g. my M8100 prints are dated 2/72, and none contain any entries in the > 'Revisions' block (lower left). However, they are marked as Rev. D, which is > newer than the KB11-A prints at Bitsaver, which are marked as Rev. C. So

Re: early PDP-11/45 info sought

> The first batch of scanning is done... 600dpi, CCITT Group 4 except for > the cover pages which are LZW. > > You will find them in my Google Drive at > > https://drive.google.com/open?id=0B2v4WRwISEQRWWFFdVpCZWFTZEU > > In subfolder pdf/dec/pdp11/1145 Thanks, Jay! I note with some amusement

Re: early PDP-11/45 info sought

> On Jan 31, 2019, at 9:19 AM, Jay Jaeger wrote: > > I am working on transcribing some DEC-O-Logs - more than are on > bitsavers that relate to the KB11-A and its cards. Oooh! I'm excited again! :-) > In the process, I came across KB11A-B0008 - which indicates that NPG, > PA, PB, LTC, ACLO

Re: early PDP-11/45 info sought

> On Jan 31, 2019, at 11:47 AM, Jay Jaeger wrote: > > I have completed my transcription of what I felt would be the most > salient entries and information in those entries of the PDP-11/45 > DEC-O-Logs. > > The transcripts are available on my Google Drive at > > https://drive.google.com/open?

Re: early PDP-11/45 info sought

> On Jan 31, 2019, at 12:02 PM, Jay Jaeger wrote: > > The parity change in the CPU was to change parity errors from vectoring > thru location 4 to vector through 114. Yes, but also, there was apparently rework of logic feeding the CONF console flag and associated abort signaling. Before the

Re: advice / suggestion wanted PDP 11/40 only boots XXDP, not RT11

> On Jan 31, 2019, at 12:26 PM, Bill Degnan via cctech > wrote: > > My PDP 11/40 suddenly lost it's ability to boot RL02 disks except the XXDP > disk. I have two drives, both boot up an XXDP (I have more than one) just > fine, but any formerly-working RT-11 (v 5, 5.1, 5.3) no longer boots, it

Re: PDP-11/45 RSTS/E boot problem

Hi all; thanks for the write-up on the issue, Noel! > On Feb 4, 2019, at 8:24 AM, Jon Elson via cctalk > wrote: > Is this truly a fault given by the memory management system, or some other > kind of fault (Unibus timeout or memory parity error)? Trap 250, which is explicitly memory management

Re: PDP-11/45 RSTS/E boot problem

> On Feb 4, 2019, at 9:13 AM, Jay Jaeger wrote: > > If he hasn't already, if Fritz has more than one memory board, he might > try swapping them to see if that changes anything. I only have an 128kw MS11-L here to work with, unfortunately. Its been through a bunch of recent troubleshooting (t

Re: PDP-11/45 RSTS/E boot problem

> On Feb 4, 2019, at 10:34 AM, Paul Koning via cctalk > wrote: > >> On Feb 4, 2019, at 12:18 PM, Bob Smith via cctalk >> wrote: >> >> I keep wondering about the psu. > > Good theory. I'll give these a double-check... > Is there any way to attach a logic analyzer to various data paths on

Re: PDP-11/45 RSTS/E boot problem

> On Feb 4, 2019, at 2:28 AM, Noel Chiappa via cctalk > wrote: > > I'm pretty sure the command only gets a few instructions in before it blows > up. Here are the process' registers, and the _entire_ contents of the user > mode stack: > > R0 10 > R1 0 > R2 0 > R3 0 > R4 34 > R5 444 > SP 1

Re: PDP-11/45 RSTS/E boot problem

>>> The obvious answer is bad memory. >> >> At the board level, yes. Deeper, it could be bad memory bits or bad >> memory decode. > > Yes, one of the standard early PDP-11 memory tests is the "no duplicate > address test". I should say that the memory board is not _completely_ whack -- it is

Re: PDP-11/45 RSTS/E boot problem

> Perhaps compile [test programs] under SimH and do a block-level diff of the > image with what is currently in use, and transfer just those blocks? I did experiment with this a little way back. I wrote a small standalone code that dumps a CRC of every sector over the console; I can run this bo

Re: PDP-11/45 RSTS/E boot problem

> On Feb 5, 2019, at 8:45 AM, Jon Elson via cctalk > wrote: > > I'd guess the diagnostic tries a few patterns to test for gross failure of > this circuitry, but since it involves memory on a system running a program, > it may not be able to exhaustively test these adders and comparators. In

Re: PDP-11/45 RSTS/E boot problem

>>> I keep wondering about the psu. >> >> Good theory. > > I'll give these a double-check... I did give these a look yesterday. Indeed, the +5 regulator in position "C" (which includes supply to the KT11) was running a little low (4.9 and change). I trimmed it up, and checked the rest of t

Re: PDP-11/45 RSTS/E boot problem

> Would it be any difference if you run the machine at full speed or lower > speed... Ah, yes -- this I haven't tried yet! I have a KM11 replica, so this is easy enough to do; I'll give that a go when I next get back to the machine (possibly this evening). > ...or even single step past this

Re: PDP-11/45 RSTS/E boot problem

> On Feb 5, 2019, at 10:03 AM, Fritz Mueller wrote: > > Unfortunately, when I tried to apply this, it seemed that SIMH's write single > sector wasn't working correctly for me... Correction to above: "PDP11GUI's write single sector". Apologies! --FritzM.

Re: PDP-11/45 RSTS/E boot problem

>> Would it be any difference if you run the machine at full speed or lower >> speed... > > Ah, yes -- this I haven't tried yet! I have a KM11 replica, so this is easy > enough to do; I'll give that a go when I next get back to the machine > (possibly this evening). Ran the machine on the mai

Re: PDP-11/45 RSTS/E boot problem

> On the logic analyzer suggestion: I remember seeing a logic analyzer hooked > to a PDP-11 at DEC, for software debugging. As I recall, it was connected at > the console front panel, which seems reasonable since several key CPU data > paths are exposed there. Ooh, I like that suggestion! It

Re: PDP-11/45 RSTS/E boot problem

> On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk > wrote: > > Is the schematic available for the memory board at-issue? > Curious myself to see what approach for refresh DEC used. Yes, here: http://bitsavers.trailing-edge.com/pdf/dec/pdp11/memory/MP00672_MS11L_engDrw.pdf There is also

Re: PDP-11/45 RSTS/E boot problem

>> On Feb 6, 2019, at 2:24 PM, Brent Hilpert via cctalk >> wrote: >> >> Is the schematic available for the memory board at-issue? >> Curious myself to see what approach for refresh DEC used. > > Yes, here: > http://bitsavers.trailing-edge.com/pdf/dec/pdp11/memory/MP00672_MS11L_engDrw.pdf Fo

Re: PDP-11/45 RSTS/E boot problem

On 2/6/19 6:25 PM, Jon Elson via cctalk wrote: I'm thinking it is bad memory.  It seems unlikely bus problems could alter only ONE BIT per word, so I think it is just a bad memory chip, and finding multiple words where the 01 bit is now turned on sure looks like that kind of problem. So

Re: PDP-11/45 RSTS/E boot problem

It looks like the question boils down to either "how did that part of the binary get to that part of memory?", or "how did we end up executing out of that part of memory?" More the former, I think... Noel, is it possible for you deduce where Unix _should_ be placing these "bad" bits (from

Re: PDP-11/45 RSTS/E boot problem

> 4116 datasheet specs 2mS, my calcs give a refresh period of 1.5mS, the 14.5uS > from the manual would give 1.86 mS, 7% shy of 2. > The schematic specs 1% resistors, and the parts list does appear to spec a > high-tolerance "1%200PPM" cap. > > Although there are the internal voltage divider Rs

Re: PDP-11/45 RSTS/E boot problem

> Seems a little less-likely to be the problem, given(?) as well that you have > fairly consistent (is deterministic overstating it?) behaviour. Yeah. We've gotten to the point now where enough layered problems have been cleared away that the remaining behavior is quite deterministic. > If you

Re: PDP-11/45 RSTS/E boot problem

> On Feb 7, 2019, at 9:47 AM, Noel Chiappa via cctalk > wrote: > > So, with UISA0 containing 01614, that gives us PA:161400 + 04200 = PA:165600, > I think. And it wound up at PA:171600 - off by 04000 (higher) - which is > obviously an interesting number. Thanks, Noel. > ...it might be intere

Re: PDP-11/45 RSTS/E boot problem

> How about a Unibus trace? That would give you the RK11 commands as well as > the data it sends in response. I don't think my sad little HP LA has enough buffer for that... --FritzM.

Re: PDP-11/45 RSTS/E boot problem

>>> How about a Unibus trace? >> >> I don't think my sad little HP LA has enough buffer for that... > > You could use triggers in innovative ways. Ah, quite right, gentlemen. This seems the best place to start with the LA this weekend then. --FritzM.

Re: PDP-11/45 RSTS/E boot problem

>> This seems the best place to start with the LA this weekend then. > > I'm going to respectfully semi-disagree! I think that at this point there's a > good chance we can localize to within a gate or two before we start applying > test instruments. Oh, I agree completely, Noel. I should have

Re: PDP-11/45 RSTS/E boot problem

Yup; specifically, the symptoms are consistent with 'D15 RKBA=ALL 1 L' being incorrectly generated at BA 16, causing an increment to EX.MEM, causing a skip in the DMA. So it looks like problem with bit 12 in that carry logic; I'll check E28 and E34 when I get back to it tonight, but I have

Re: PDP-11/45 RSTS/E boot problem

SUCCESS!! Put the M795 out on an extender, loaded 16 in RKBAR, and had a look around with a logic probe. Narrowed it down to E34 (a 7430 8-input NAND). Pulled, socketed, replaced, and off she goes! I can now successfully boot and run both V6 Unix and RSTS/E V06C from disk. *THAT* was a r

Re: PDP-11/45 RSTS/E boot problem

On 2/13/19 5:20 PM, Jerry Weiss wrote: I am trying to understand how the diagnostics didn't reveal this defect.  I see in the source for the diagnostic DZRKH-F there are tests for address in the 28K-32K range and also for the 32K boundary. So, to catch this defect the diagnostic would have to

PDP-11/45 RSTS/E boot problem

[oops, accidentally replied directly instead of to the list] On 2/13/19 12:54 PM, Ethan Dicks wrote: > It's interesting that it was a bad 7430 in [your RK11-C]. I find that for > equipment of that vintage, my usual suspects are failed 7474s and failed > 7440s, probably 80% of the total. Behind

Re: PDP-11/45 RSTS/E boot problem

That's right -- I wasn't without an army, it was just a very small and quite dedicated army! :-) I think I'd have gone down many blind alleys without help and perspective provided by others here, and in particular a lot guidance provided by Noel over the past couple weeks in private corresponde

PDP-11 LDA BFD backend for gnu binutils

I've been thinking it might be nice to have an LDA BFD backend for gnu binutils, so gas, ld, objdump etc. could deal with LDA's directly without having to use separate conversion utilities. Before jumping in on that, though, I thought I'd ask here to see if anybody might have already started or

Re: PDP-11 LDA BFD backend for gnu binutils

> On Feb 24, 2019, at 10:16 AM, Paul Koning wrote: > What LDA do you have in mind? Absolute loader binary, for bare metal > execution? I had in mind absolute loader binary for bare metal as a starting point. Most of the coding I’ve had to do on my restoration adventure has been standalone t

V6 cc needs hash before whitespace before first include?

So, I've been having some fun playing around with V6 Unix on my 11/45 a bit after that last repair. I've just been tripped up for a little over the fact that the C compiler barfs if there is whitespace/comentary before the first #include; the workaround seems to be to add a lone '#' at the begi

Re: V6 cc needs hash before whitespace before first include?

> On Feb 28, 2019, at 11:43 AM, Phil Budne wrote: > It's an indicator that the pre-processor needs to be run first. Ah, okay! So that's a fun bit of V6 apocrypha. Was this gone by V7?

atex system in Houston

Hmmm, are these the atex racks seen lurking in the background of that recent storage space trawl down near Houston? https://www.ebay.com/itm/Vintage-DEC-PDP-11-34-Minicomputer-With-Kennedy-Tape-Drive-J11-CPU-2-Terminals/123688125244

Re: SIMH question

> On Apr 23, 2019, at 5:34 PM, Charles via cctalk wrote: > > This may be a silly question... but how can I transfer a text file from my PC > into SIMH for PDP-11? I've found the most convenient way to do this, for a file or two at a time, is to use the paper tape reader/punch devices. These

Re: PDP-11/40 available, Arizona

On 5/10/19 6:42 PM, Adam Thornton via cctech wrote: I have been invited out to the site tomorrow morning to take an inventory of what’s there (I live near the machines). I imagine that I may well have a lot of photos that I bring to the list and say “what is this?” Standing by to help out!

Re: Kaur Collection Inventory

Hi Adam, 2307 is an LA30-P (the parallel version of the LA30), like the ones restored by Herb, Mattis, and myself: http://www.retrotechnology.com/herbs_stuff/decwriter.html http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-04 (scroll down 3/4) http://fritzm.github.io/la30

keycaps / switches for Tek 4006

Hi folks, I recently obtained a Tek 4006 from eBay as a repair/restoration project. It is missing a few keycaps (both SHIFT keycaps, COPY, LINE FEED, and :/*). In addition, one of the key mechanisms has a broken plunger. Last, the little green paddle line power toggle power switch at the bac

Re: keycaps / switches for Tek 4006

> On Jul 25, 2019, at 10:29 AM, Fritz Mueller wrote: > > I recently obtained a Tek 4006 from eBay as a repair/restoration project. It > is missing a few keycaps (both SHIFT keycaps, COPY, LINE FEED, and :/*). In > addition, one of the key mechanisms has a broken plunger. Last, the little

Re: keycaps / switches for Tek 4006

> Can you take a picture of the switches? > Cindy Some pics of they keyboard assembly, key cap underside, key mechs, and also the power toggle I'd like to replace, are here: https://drive.google.com/open?id=1dKBOdhwgpedYpYCKbGxrd3P9jCNwBRs5

Re: keycaps / switches for Tek 4006

After a little more research on the net tonight: it looks like the keyboard in the 4006 was pretty much one of Cherry's standard "B70 ASR" models. The key mechs are known as M7 T-mount, and the caps look like the standard double shot ones supplied by Cherry in their mid to late 70's catalogs.

Re: I'm sharing a toy

> I don't think writing SIMH device emulators for things like the DEC Unibus > D/A and A/D devices, or the DR11-A, would be at all hard. Yes; I have also thought it would be nice to have something like a DR11-C in simh, which could be configured to call into a dynamic library containing user co

Re: XXDP on PDP-11/03

> I don't know if the front console on the early UNIBUS machines works without > any memory on the UNIBUS - I'm too lazy to check. I have this vague memory > that > they do, though. The front console on the '45 indeed does run just fine with no UNIBUS (or FASTBUS) memory in the machine. Its is

multi-section cap for Tek 4006

I'm working my way through a Tektronix 4006 terminal purchased of eBay right now. First stage is the low voltage power supplies, and I noticed right away that one of the multi-stage electrolytic filter caps there was running quite hot (this was with downstream electronics isolated, and a 40 ohm

Re: multi-section cap for Tek 4006

> On Aug 18, 2019, at 1:52 PM, Al Kossow via cctalk > wrote: >> Rebuilding cans is a common practice now, since they are LONG out of >> production. > https://www.nmr.mgh.harvard.edu/~reese/electrolytics/ Thanks, Al. This is definitely plan B, unless somebody here comes through with a miracle

Re: VT52 keyboard question

> On Mon, Mar 13, 2017 at 4:45 PM, Marc Howard via cctech < > cct...@classiccmp.org> wrote: > >> Hi, >> >> The "2" key on my VT52 is very hard to use. You've gotta pound it and you >> might get 2 "2"s for your trouble. I've a similar key on my VT52 -- will be diving in there sometime soon to ch

FTGH: EMM / CMU MICRORAM UNIBUS memories & docs

Okay, I'm trying to beat back the hoard in my basement before the rainy season starts here in CA: I have a couple of NMOS static RAM UNIBUS address spaces that I picked up from CMU sometime back in the mid-'80s once when they were cleaning house. I've been hauling these around for 30+ years, t

cctalk@classiccmp.org

First off, I've had a couple of follow-ups on these units, so they are spoken for at this point. The member with first dibs has also offered to scan the docs and see that they make their way to Al. I was wondering if these were c.mmp cast-offs? Guy: I encountered these in the CMU computer c

cctalk@classiccmp.org

There were only 2 11/45s that I knew of.  The first was the “front end” that sat in front of all of the terminals and allowed connection to the various 10s (at the time there were 3: 2 KA10s and a KL10), C.MMP and CM*.  The other 11/45 ran the XGP... They had moved on to a Xerox 9700 and DECSY

Re: Looking for documentation for VAX-11/730 ENKCC Diagnostic

> On Nov 13, 2019, at 9:21 AM, Jay Jaeger via cctalk > wrote: > Sure. Works for me. There are, in all, likely well over 1000 fiche... > 3) I have several sets. Which of them would you want to scan? > > On 11/13/2019 12:02 AM, Josh Dersch wrote: >> >> If you're willing to send them out, th

RX01 wants

Hi all, I recently picked up a “tabletop” RX01 drive for cheaps. So now I’m in the market for: - RK11 controller - cables - rack ears, rails (how was this done?) - formatted media If anybody here might have any of this and like to work out a deal, feel free to let me know off-list! thanks

Re: RX01 wants

Hi Paul, > I think you mean RX11. Ah, yes — I typo’d that, thanks! > Isn't the BC05L-15 folded up in the case? Or did they put a short one to the > back of the box? I can't remember now. I’ll have a look to remind myself when I get downstairs later today. IIRC, everything is brought out to

Re: RX01 wants

Hi Ulrich, > On Nov 17, 2019, at 3:59 AM, Ulrich Tagge via cctalk > wrote: > I'm interested in the RX01 Drive and equipment. > Where is the stuff located? Unfortunately, the list in my email was stuff I wish to buy, not sell :-) Sorry for being unclear! --FritzM.

Re: RX01 wants

Hi Ethan, > On Nov 17, 2019, at 11:25 AM, Ethan Dicks wrote: > The box is kind of fun, and was standard for word processors and the > MINC-11 but I can understand wanting a rackable system. Thanks for the info! I’m all for keeping things intact when possible, so I’d also be happy to do a trade

Re: Who changed the gravitational constant (Dec pdp11 stuff)

On 11/22/19 11:16 AM, Chris Zach via cctalk wrote: https://i.imgur.com/7BwIwas.jpg Ah man, I'm jealous of your VT52 roll-around stand -- wish I could find one for my VT52! --FritzM.

Re: RK11-D "diskless" test ZRKJE0???

> On Jul 9, 2020, at 5:02 PM, Robert Armstrong via cctech > wrote: > I have an 11/04 with an RK11-D. I have a couple of RK05s, but I wanted to > test the controller before I start working on the drives. The PDP11 > Diagnostic Handbook says that ZRKJ?? "checks only the drive-independent logi

Re: Restoring a VT50 (VT52 actually) .

> On Dec 26, 2017, at 3:25 AM, Mattis Lind via cctalk > wrote: > > … Instead I came up with a small > circuit (well stole actually from the VT100 schematics) that generated a > composite video signal from the TTL signals generated by the VT52… Oh — this is a cool idea! Will keep in the bag of

Re: Restoring a VT50 (VT52 actually) .

On Dec 26, 2017, at 2:22 PM, Mattis Lind wrote: > > Before putting everything together I also dumped the chargen ROM board… Ah, yes — I did this with my own VT52 last xmas break! I breadboarded a little scanner for that task because my chargen ROM was not socketed, and I didn’t want to risk d

RT-11 idle light pattern

I have been able to sysgen an RT-11 XM monitor with the idle loop light pattern enabled, and install and boot it on my PDP-11/45. Here’s a video of the idle lights: https://www.youtube.com/watch?v=ycADKwgnLpE I built the latest simh and tu58em from source on my MacBook, then was able to do th

Re: RT-11 idle light pattern

> On Dec 27, 2017, at 8:23 AM, Paul Koning wrote: > > ; "A SOURCE OF INNOCENT MERRIMENT!" > ; - W.S. GILBERT, "MIKADO" > ; "DID NOTHING IN PARTICULAR, AND DID IT VERY WELL" > ; - W.S. GILBERT, "IOLANTHE" > ; "TO BE IDLE IS THE ULTIMATE PURPOSE OF THE BUSY" > ; - SAMUEL JOHNSON, "THE

40 pin Berg cable connector recommendations for PDP-11 projects?

Hello PDP-11 crowd: I’m thinking of starting a project that will interface to a DR11-C, which has the usual 40-pin Berg ribbon cable connectors. I thought I’d ping the collected wisdom here to see if other folks had already sourced an available modern cable connector for this that they partic

Re: GT-40 etc.

On Jan 13, 2018, at 10:30 AM, Noel Chiappa via cctalk wrote: > that exposed backplane above it _might_ be an RK11-C... Definitely an RK11-C — having recently restored one in my 11/45, I can see the flying components on the backplane here are in just the right places. And it would make sense w

Re: GT-40 etc.

On Jan 13, 2018, at 1:09 PM, Noel Chiappa via cctalk wrote: > Ah; the dual-wide plug-in connector soldered onto the back kind of threw me a > bit! Yeah it’s a bit weird, but mine has that too. It’s a pass-through, and It turns out, handily, that that you can plug in a KM11 right there for t

ultrasonic cleaning for disk heads

I watched with great interest one of curiousmarc’s recent Alto videos, wherein they clean a Diablo drive head ultrasonically. I’ve been struggling a bit with my restored RK05 drives to completely clean the heads after minor head crashes. Not being able to get them really sparkling clean makes

RK05 rear filters/brackets

My restored RK05 drives are missing their rear air filters (the ones that cover the back of the card cage). I would like to fashion some sort of replacements. If anybody here has access to drives with the original filters, I’d really appreciate a few photos so I can see what these looked like

Re: RK05 rear filters/brackets

> On Jan 26, 2018, at 2:14 PM, Bill Degnan wrote: > http://vintagecomputer.net/digital/pdp8e/RK05_ext-filter.jpg > http://vintagecomputer.net/browse_thread.cfm?id=588 Thanks, Bill! I am also missing the brackets, so looking for pics of those as well. —FritzM.

Re: RK05 rear filters/brackets

On Jan 27, 2018, at 8:46 AM, Noel Chiappa via cctalk wrote: > http://gunkies.org/wiki/RK05_disk_drive#Prefilter_frame Thank you!

Re: ultrasonic cleaning for disk heads

Thanks for the tip on heating, Carl. > On Jan 27, 2018, at 11:02 AM, Mark J. Blair via cctalk > wrote: > Some dumb questions from a guy who has not yet experienced his first head > crash on a removable-pack hard drive: > > When it happens, am I correct in assuming that the pack is toast, and

Re:

On Jan 27, 2018, at 11:05 AM, Mark J. Blair via cctech wrote: > Isopropyl alcohol. Not very good for drinking; even store-brand vodka in > plastic jugs is less harsh. :) Haha — I don’t think I’ve had any “jug vodka” since college house-party days, but that takes me back :-) —FritzM.

Re: Looking for Heath H-29 operation manual and schematic

Hi Al, I may have some Z-29 docs around, if that would be helpful? I’ll have a look; if I can find them I’d be happy to send them your way for scanning. —FritzM.

Re: Restoring a VT50 (VT52 actually) .

On 12/26/2017 5:25 AM, Mattis Lind via cctalk wrote: > Since the terminal appears to work I also dumped the firmware out of the four > bipolar PROMs. > > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/124A9.HEX > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/125A9.HEX > ht

Re: PDP11 I/O page memory map

> On Mar 2, 2018, at 5:37 AM, Noel Chiappa via cctalk > wrote: > >> From: Jerry Weiss >> Typically execution of the RESET instruction in a user program is >> treated as a NOP > > Yeah, that's not documented in most PDP-11 CPU manuals, either. It's one of > the things that makes the PDP-11 impo

Re: FTGH: Pair of unknown extender cards

> On Mar 4, 2018, at 11:09 AM, Noel Chiappa via cctalk > wrote: > OK, another pair of unknown extender cards: Spring cleaning, Noel? :-)

allocate floating vector for DR11-C in simh pdp11 autoconfig?

Hi folks, I have found it very convenient to maintain a simh configuration that parallels the physical hardware configuration of my PDP-11/45. I'm just about to add a DR11-C for a physical interface that I am building -- this will "grab" a floating interrupt ahead of a DZ11 that I already have

Re: allocate floating vector for DR11-C in simh pdp11 autoconfig?

> On Mar 11, 2018, at 3:55 PM, Fritz Mueller wrote: > > I have found it very convenient to maintain a simh configuration that > parallels the physical hardware configuration of my PDP-11/45. I'm just > about to add a DR11-C for a physical interface that I am building -- this > will "grab" a

PDP-11 floating CSRs: 760010, or 760100?

Hi folks, I have a question about floating CSR allocation on PDP-11s. Both the 1976 and 1981 versions of the PDP-11 peripherals handbook indicate the floating CSRs are to be allocated starting at address 760010. However, both the XXDP FLOAT program and simh's autoconfig suggest I should set m

Re: PDP-11 floating CSRs: 760010, or 760100?

> On Mar 17, 2018, at 6:57 PM, Fritz Mueller wrote: > > I have a question about floating CSR allocation on PDP-11s. Both the 1976 > and 1981 versions of the PDP-11 peripherals handbook indicate the floating > CSRs are to be allocated starting at address 760010. However, both the XXDP > FLOA

RT-11 V4 MU-BASIC help

Hello all, I would like to try and get MU-BASIC working on my PDP-11/45, under RT-11 V4. The best bits I've been able to find to work with so far are the RK05 image here: http://bitsavers.trailing-edge.com/bits/DEC/pdp11/discimages/rk05/rt11v4-mubasicv2.rk.gz ...but I've not had much

Re: RT-11 V4 MU-BASIC help

> On Mar 29, 2018, at 9:53 PM, Mattis Lind wrote: > > I have imaged some RX01 and RX02 floppy disks with RT11 V3B and MU Basic. > http://www.datormuseum.se/documentation-software/rx01-and-rx02-floppy-disks > Hi Mat

Re: RT-11 V4 MU-BASIC help

> On Mar 29, 2018, at 11:01 PM, Mattis Lind wrote: > > Fixed now (I hope). Yes, I was able to get these now, I will give them a go -- thanks again! I also see that there's a paper tape distribution up on bitsavers, but it looks like it might be v1? --FritzM.

Re: RL02 Question

>> It is also possible that a capacitor has deteriorated in the >> timeout one-shot > > I was beginning to wonder if it was a capacitor FWIW, while restoring my 11/45 and its RK11-C, I found several failed 74LS123 dual one-shots in various places. Haven’t looked at the RL02 drawings yet, but i

Re: RT-11 V4 MU-BASIC help

> On Mar 30, 2018, at 8:25 AM, Sytse van Slooten wrote: > > I've used that image quite a bit for testing my vhdl pdp11. So it should work. Thanks, Sytse. In my case, I kept running up against traps and halts after that point, while interacting with MU-BASIC after the "say hello" prompt. I m

How to set DZ11 line speeds under RT-11 V4?

Hi all, I've now had some success getting MU-BASIC configured and running on multiple terminals under RT-11 V4 in simh, with a hardware configuration similar to that in my real PDP-11/45. I have a serial console + DZ11 in both configurations. When SYSGEN-ing RT-11 V4, the only speed initializa

Re: How to set DZ11 line speeds under RT-11 V4?

> On Mar 30, 2018, at 10:37 AM, Fritz Mueller wrote: > > When SYSGEN-ing RT-11 V4, the only speed initialization options offered for > the DZ11 lines are 110 or 300 baud. Is there a utility or incantation which > will allow me to reconfigure these after RT-11 is booted? So I found that the s

Re: Looking for Heath H-29 operation manual and schematic

Al, following up on this thread from February, in case you are still looking, I just came across my copies of: - Z-29 Uers's & Technical Guide (1983) - Z-29 ASCII character and escape code chart Despite the claim to be a "Technical" guide, the above is really more of a user manual, containi

Re: DEC power connectors (UNIBUS PDP-11s, mostly)

If these are what you are talking about, I ordered up a bunch a couple years ago when I rebuilt the power harness for my 11/45, and can attest they are the right thing: https://www.connectorpeople.com/Connector/TYCO-AMP-TE_CONNECTIVITY/1/1-480460-0 https://www.connectorpeople.com/Connector/TYC

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 26, 2018, at 12:19 AM, Mattis Lind via cctalk > wrote: > > You need to move the motor to a new position in the RK05. The drive is > already prepared for all this. It is just the pulley, moving the motor and > the 220VAC jumper that is needed. I'm just wor

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 26, 2018, at 12:19 AM, Mattis Lind via cctalk > wrote: > > You need to move the motor to a new position in the RK05. The drive is > already prepared for all this. It is just the pulley, moving the motor and > the 220VAC jumper that is needed. I'm just working on my second RK05 drive

Re: Fire-Sale PDP-11 update (and request for parts)

> On Dec 4, 2020, at 10:41 PM, Josh Dersch via cctalk > wrote: > I realize this is unlikely, but I was curious if anyone has 1) any > parts of the 11/45 power wiring harness... I can build my own wiring > harness, but if I can save > myself the trouble, that'd be nice. Yeah, I had build my o

DEC H765 line interference caps

Hi all, I’m just starting in on a PDP-11/34 for a friend (happy holidays!) I currently have the H765 power supply torn down for cleaning, inspection, and testing as a first step. While I have the transformer out on the bench, I’m wondering about the line interference supression caps on the “C

PDP-11/34 /04 power knob anyone?

Hi folks, I’m working on an 11/34 at the moment, with the programmer’s console, and it is missing its front panel power control knob. I think it is the same one used on the 11/04? Anybody have a spare in their parts stock that they’d be willing to part with? (I’m also missing the plastic hal

Re: PDP-11/34 /04 power knob anyone?

> On Jan 9, 2021, at 3:54 PM, Bill Degnan wrote: > 3d-printable? It would seem so. I don’t have one to measure, though, and I haven’t seen any 3d models online yet. I could probably eyeball it, but anybody have one and care to measure? Does the original have a brass bushing?

Re: PDP-11/34 /04 power knob anyone?

This might be a reasonable stand-in for now: https://www.millsupply.com/knob-fan-speed-grumman-olson-53777.php?p=324629 > On Jan 9, 2021, at 4:25 PM, Fritz Mueller wrote: > > >> On Jan 9, 2021, at 3:54 PM, Bill Degnan wrote: >> 3d-printable? > > It would seem so. I don’t have one to measure

DEC: securing 15V pwr monitor board in H765 supply

Hi all, I’m reassembling an H765 supply after cleaning and repairs. It has the "newer" style 15V and power monitoring board (the one with the edge finger connector, same as used in H7420 supplies.) The board slides into a slot in a sub-chassis that also houses the power control circuitry, whi

Re: securing 15V pwr monitor board in H765 supply

> On Jan 19, 2021, at 3:11 AM, Paul Birkel wrote: > Fritz: You are referring to the 5411086 board as seen in the lower picture > at: http://gunkies.org/wiki/DEC_Power_Line_Monitor ? Yes, exactly. > Mine has screws on all four corners to secure it to corresponding tabs in the > metal frame f

Re: DEC backplane power connectors

> https://gunkies.org/wiki/DEC_power_distribution_connectors#Connectors Very useful page; thanks Noel! > I'm not sure why I bothered to write all this stuff up; it was clearly a waste > of time. Arguably (?) not, if you consider cctalk to be the "search engine" that links people there :-) -

<    1   2   3   >