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101090 discussions

Keyboard inverters/converters for terminals

by sales＠elecplus.com

https://www.vecmar.com/products/search.asp Type in keyboard The first result allows a terminal keyboard to be used on a PS/2 port. The second result allows a PS/2 keyboard to be used on a terminal. Not affiliated with seller, etc. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

5 years, 11 months

Nova BASIC paper tape image

by camiel＠camicom.com

Does anyone have an image of the BASIC interpreter paper tape for the DG Nova?

5 years, 11 months

SMS Data Gathering App Announcement

by cube1＠charter.net

As some here probably know, I have been working the last couple of years working towards an FGPA gate-authentic replica of the IBM 1410 - the larger cousin to the IBM 1401. In 2018 I developed an application for gathering information of of ALDs and stuffing it into a MySQL database, then spent the rest of the year entering the information from the ALDs into the system, but I did not share that application or the data. Then I took a year off - it had been a grind. This year I took up the torch again. I put the application up on github, gave it the requisite GPL attributions, and started tracking my bugs, fixes and enhancements there, even though I am working alone. I fixed some of the warts, generalized it some, fixed a few bugs, added some database checking reports and data checking reports, and so on. I also spent quite a bit of time generalizing it, so that it will hopefully be usable (perhaps with some more fixes / enhancements / generalizing for most any SMS machine (IBM 1620, IBM 709x, IBM 1401 etc. etc. etc.) The application is available on github at: https://github.com/cube1us/IBM1410SMS The actual "root" source control is on my system at home using subversion. I use "git svn" to keep a git version in sync, and then push that to github. The application was/is developed in C# under Visual Studio 2017 to run under Windows, primarily because I was interested in trying out C#. I would expect it to build in VS 2019 with little or no change, but have not tried it. I could have used a more basic tool setup (say, C or C++ and a non-windows presentation layer), but I figured not all that many people would be interested in the thing, and the VS environment eased development quite a bit. I suspect it would work OK under WINE, but I have not tried doing so. There are also a couple of tools, one in Perl for generating database related classes from the database, and one in Python for checking for database referential integrity. ( was curious about Python, and this seemed a good candidate for an evaluation of it. It did, however reinforce my dislike for many things about Python. The application is comprised of two Visual Studio projects, one for the data gather app itself, the other a very very light weight database interface, that ought to make it not too hard to port it to a different DBMS. github also has a copy of the database, the MySQL Workbench data model (and a PDF print) and documentation in MS Word (and a PDF print). The code is not good. There, I said it. It is not truly OO at all. I didn't do much refactoring even when I saw common code or saw considerable potential to consolidate code. The downside of that is that there is lots of duplicate code. The upside is that you don't have to go umpteen layers deep in OO design to figure out what the darn thing does. Doesn't even use database views, though they probably would have been helpful. Just a bunch of tables. Lots of tables in a close but not fully relational model. The data gathered by the application in the database comprises about: 917 ALD (Automated Logic Diagram) 11" x 17" pages 10596 Logic Blocks on those pages (so average of 11.5 per page) 1281 DOT functions (Wired OR / AND) 14021 Inter-sheet signals (which appear on multiple sheets) 4222 Distinct inter-sheet signals 32746 Connections between the above items That connection number makes me shake my head - I had to enter each and every one of the darn things. Yeesh. Capturing all of that was between something like 600 and 1000 hours, maybe more (but not 2000 hours), after maybe 200 hours on the initial version of the application. My next phase is working hard on the part of the project that generates HDL for FPGA synthesis. I expect that to take many months as I synthesize, simulate with the tool set and figure stuff out. I'd be interesting in hearing from folks what toolsets they have used for HDL (VHDL in particular). I started with Xilinx ISE and then graduated to Vivado for later chipsets - unfortunately, Vivado seems to be something of a dog, in terms of time to compile HDL and synthesize logic. If folks find this interesting, and especially if they want to use it, I'd love to know about it. I intend to keep this a single-person effort, git-wise, but folks can feel free to fork (if anyone wants to bother ;) ), and let me know if they find anything seriously wrong. For what it's worth, my IBM 1410 cycle-level simulator for the IBM 1410 is also available, at: https://github.com/cube1us/1410

5 years, 11 months

2.11bsd unix resolver

by jacob.ritorto＠gmail.com

Hi, I've installed the recent release of 2.11bsd on my pdp11/73 and recompiled the kernel to fit. But for some reason I can't resolve hosts >from my /etc/hosts file now; only DNS names.. I'm not running BIND. Is there a setting that will allow me to find /etc/hosts entries first and then DNS in this operating system? I can't even resolve localhost! thx jake

5 years, 11 months

ISO: Diablo 30 heads

by derschjo＠gmail.com

Hi all -- I'm restoring a Xerox Alto and I started going over the system's Diablo 30 drive. The heads are in bad shape; the bottom one is actually missing both parts of the erase poles (so the black portion of the head no longer makes a "t", it's just a black line). This means the head (in addition to not being able to erase) also won't float due to the head having small cavities in them. The upper head looks a little better but I'd love to find a set of upper and lower heads if anyone has spares. Then I get to learn how to align these things. Thanks! - Josh

5 years, 11 months

FTGH - Decstation 5000 plus many extras

by trash80＠internode.on.net

Lets have another go (but this time I have some pictures) Decstation 5000/125 ? also houses a CD drive. Two expansion storage boxes ? one has a tape drive and the other one has a floppy drive. Two very large and heavy RGB Digital monitors ? one has both Digital and Sony branding on the back of it. I haven?t dug the other one out as its in a corner and is dam heavy but it looks the same as the other one. Box of spares (RAM, CPU's, HDDs etc.) I?ve never powered it up ? it was a rescue ? I believe it was a server in a TAFE college in Adelaide. This is all I got from the rescue bar the box of spares. The original owner had tossed all the documentation and software. Please note that the stand is not included in my offer and its located in south western Victoria (Australia). Photos: http://koken.advancedimaging.com.au/index.php?/albums/decstation/ Kevin Parker

5 years, 11 months

[cctalk] Re: Replacing the Flyback Transformer From My VAXmate

by w9gb＠icloud.com

Tai-Ho (Taiwan) was the OEM supplier for flyback transformers used by Apple in the early Macintosh computers (1984+). Russell Industries (New York, USA) produced replacement flyback transformers for monitors and TVs, these appear on eBay and remaining TV repair supply houses. As noted, while the circular pin-out is often standardized, the voltages need to be double-checked. greg chicago == From: "Rob Jarratt" <robert.jarratt at ntlworld.com> To: "General Discussion: On-Topic and Off-Topic Posts" Subject: Replacing the Flyback Transformer From My VAXmate I am about as certain as I can be that the flyback transformer from my VAXmate monitor board has failed. I know this is probably impossible, but I am wondering if there is a way to find a more modern equivalent? How standardised are these things? I do see a lot that appear to have the same circular arrangement of the pins. The VAXmate one is a Tai-Ho TH-1802B and according the Technical Description has a primary voltage of +28V and produces auxiliary voltages as follows: +13.1kV @85uA max +950V @200uA +45V @75mA max -100V @1.2mA Regards Rob

5 years, 11 months

LK201 emulation

by amp1ron＠gmail.com

If anyone wants a PS/2 keyboard adapter that emulates an LK201, there's Peter Bosch's Arduino Nano based lk201emu: https://github.com/peterbjornx/lk201emu His writeup on this is still in the Wayback Machine: https://web.archive.org/web/20180703165508/https://peterbjornx.nl/vtkbd/ I can no longer find a copy of Peter's schematic for this online, but at some point I grabbed a copy of it. I've renamed it from schem.pdf to lk201emu-schem.pdf and made it available at: https://drive.google.com/open?id=1XmRClTCoIedfXDcUbcaJi-A9QXr7SCEo -- Ron

5 years, 11 months

Evans & Sutherland PS-2?

by brad＠heeltoe.com

Does anyone have, or know of low level documentation for Evans & Sutherland Picture System 2 hardware? I walk past a PS-2 monitor all the time and some of us started talking about bringing it back to life.? I'm not sure if more of the system exists, but it might.? I plan to check. I looked on bitsavers and there's nothing I could find on the picture system.? Other E&S hardware, but not PS. Anyone know if any systems still exist?? I'd have to think the CHM has at least one.?? Back in the day they were sort of required for anyone doing commercial animation (or at least, that's what I could claim/recall but it was a long time ago) Brad

5 years, 11 months

Looking for IBM OS/VS2 TCAM Programmer's manual.

by mattislind＠gmail.com

Preferably OS/VS2 TCAM System Programmer's Guide TCAM Level 10. GC30-2051 but I think it is similar to OS/VS2 TCAM Programmer's Guide, GC30-2041. I get a hit for the former one: http://www.computinghistory.org.uk/det/9844/OS-VS-TCAM-Progarmmer-s-Guide-T… But it is not online. Any one has a scanned copy of this document? Anyone that has a copy that they could scan, sell or lend so that I can scan it? /Mattis

5 years, 11 months

Replacing the Flyback Transformer From My VAXmate

by robert.jarratt＠ntlworld.com

I am about as certain as I can be that the flyback transformer from my VAXmate monitor board has failed. I know this is probably impossible, but I am wondering if there is a way to find a more modern equivalent? How standardised are these things? I do see a lot that appear to have the same circular arrangement of the pins. The VAXmate one is a Tai-Ho TH-1802B and according the Technical Description has a primary voltage of +28V and produces auxiliary voltages as follows: +13.1kV @85uA max +950V @200uA +45V @75mA max -100V @1.2mA Regards Rob

5 years, 11 months

OSI floppy test program

by djg＠pdp8online.com

I and others were having some problems with our floppy drives. Since I couldn't find a diagnostic program for the Ohio Scientific I wrote one. http://www.pdp8online.com/osi/osi-floppy-test.shtml With some floppy testing info here http://www.pdp8online.com/osi/floppy-repair.shtml If you try it let me know how it goes.

5 years, 11 months

VAXStation 3200 RAM repair video (again)

by joezatarski＠gmail.com

I had to repair the RAM board in my VS3200/KA650 again, so I took video of the whole process (less about a whole day I lost troubleshooting a trace I nicked). Maybe some of you will find it interesting to watch. https://youtu.be/3LxTJIzow2k (tip: get through youtube videos faster by setting to double speed, etc. :)

5 years, 11 months

Fixing Dungeon on RSX 4.2

by cz＠alembic.crystel.com

So I'm working on fixing some old code here. Found my balticon gaming system disks from 1990 (yes, I used to drag a pdp11 and 4 terminals to Balticon and other cons for computer gaming) and dungeon works on the 4.0 RSX version I was using but when I try to run it on 4.2 I get an Error 4 at PC 162570. I tried recompiling: RSXCMP works fine and compiles all the modules however when I run TKB with the rsxbld I get a bunch of *DIAG* Segment (root3, rooms, etc) has address overflow: allocation deleted. What am I doing wrong today? The task builder file is: dungeon/cp/fp=d.odl/mp stack=384 libr=fcsres:ro asg=sy:1:2:3:4,TI:5,CO:6 Reading the docs I see: The Fortran-IV-Plus object time library must be merged into the system library (SYSLIB.OLB). Further, the library must be set up to invoke the short error text module ($SHORT) as the default. Task building with a separate object time library produces numerous errors; task building with a resident library or the normal error text module produces an oversize task image. This might be the problem, anyone remember how to put the short error text module into syslib.olb? Hm. Maybe it is. Hm.... C

5 years, 11 months

DEC TK50 common failures?

by mcr＠martin-reilly.com

I'm trying to bring a pdp-11/83 back to working order. Challenge right now is storage - I have RQDX3 and RD54 but the RD54 appears to be unserviceable (never goes ready) and TQK50 with a TK50 which never gets to a stage of allowing me to operate the handle to load a cartridge - the green LED doesn't come on, the red LED is solid for a short time after power applied but then flashes rapidly. I plan to go with an MFM emulator in place of the disk, but would like to get a TK50 working as I have a lot of old stuff I'd like to try reading off cartridges. I have a spare TK50 drive, which behaves exactly the same. The TQK50 LEDs suggest it passes diagnostics, and the boot menu recognises it and will attempt to boot from it before saying there is no such drive. I don't have a spare controller. There is a lot of very detailed documentation for the TQK50/TK50 as far as the electronics and interfacing is concerned but I haven't found much in the way of information about the mechanical side. Are there common failure modes for these drives when they've been stored for a long time? Last time they were powered up is probably close to 20 years ago. Without much in the way of test kit (I have multimeter but no scope) is there anything I might be able to check easily? Thanks, Martin

5 years, 11 months

VT52 is back in service!

by cz＠alembic.crystel.com

Well, I put the VT52 back together, tightened all the bolts, plugged it in, turned it on and enjoyed the silence. I can just barely hear the transformer hum but that's about it. Hooked it up to my PDT11/150, booted up RT11 and the display is perfectly crisp and clear. Ran space invaders to check it out, no bugs or errors and the screen updates perfectly. Glad I got this working again. I'll take a look at that transistor, I'm almost 100% positive the switching transistor is either leaking or going bad. Either way I'll order a transistor when I have some time and put it in eventually to see if it works. But to be honest the new regulator is a thousand times better than the original discrete logic system. So moral: If your VT52 goes nutty and the screen becomes a blur try checking all of the voltages. An errant -12v will make the screen unreadable at -15v and I'm guessing oddness on the other voltage levels will do similar things as well. And don't leave it on for days, that's probably what pushed the transistor over the edge, but I'm guessing it has been crummy for awhile which is why I heard all that noise in the high voltage circuit. I feel like I accomplished something today. Thanks everyone for the help and thoughts in getting this old girl to work again... CZ

5 years, 11 months

Replacing Power LED on MicroVAX 3100/95 Power Supply

by robert.jarratt＠ntlworld.com

In fixing my PSU I managed to break the leads to the LED on the front of the PSU, probably through metal fatigue. I seem to remember people saying it is quite difficult to replace these, mainly because you can't get them out without breaking the holder. Is that right? Has anyone done this successfully and have any tips? Are there any recommendations for a replacement? If I remember correctly the LEDs used in those days were not as bright as modern ones and a modern one would end up being much brighter because of the higher voltage maybe? Thanks Rob

5 years, 11 months

Monrobot : A trip down memory lane in the world of computers

by cisin＠xenosoft.com

A friend recently reminesced about the Monrobot, which we have discussed a little bit lately, . . . [Note: Unrelated to the Marilyn Monroebot on Futurama] ---------- Forwarded message ---------- Date: Wed, 13 May 2020 16:38:22 +0000 (UTC) Subject: A trip down memory lane in the world of computers (I probably have shared this with you in the past) from an email to another friend... My high school... Erasmus Hall High School in Brooklyn...?? ? listed as THE LARGEST PUBLIC HIGH SCHOOL IN THE WESTERN WORLD (I guess they were trying to exclude China and India at the time) was the first in NY City to get its own computer... in 1965.?? ??IT was a Monrobot XI 2000. Regarding that Monrobot XI?? 2000...?? ?? ??made by the Monroe desktop calculator company of that era... Its main memory was a rotating magnetic drum, with 2K?? 16 bit words of fast electronic storage.?? Cycle op time was 11 milliseconds.?? It used 16 bit words, and one wrote its machine language using what was NOT called "Hexadecimal", but instead "Sexadecimal" (Latin, not Greek prefix was used)?? numbers, and NOT 1-9 then A-F, but rather 1-9 and then T-X.?? Storage was on punched paper tape. I learned to program it so that I could optimize access to the rotating drum memory and get three accesses (the max possible) per revolution of the drum, as much as tripling memory access speed. 11 milliseconds means?? 100 cycles per second.?? ??Modern desktop PCs operate at around 3,000,000,000 cycles per second.Compared to the 2,000 words of main system memory of the Monrobot XI, today's desktop PCs have around 8 to 32 billion words of memory. I programmed it?? (at age 14, in 1965) in machine language (the computer teacher didn't know how to do that)?? ... wrote a program for it to allow me to input and it to output to its printer a sequence of 3 strip tease images I got from a printout at Columbia University where I was then going to the Science Honors Program for high school kids, there. on weekends. ---------- Forwarded message ---------- I may be wrong about Erasmus Hall High School of Brooklyn being THE first high school in NY City to get its own computer. There is a reference elsewhere to Bronx High School of Science kids being taught IBM 650 language in 1959 or so. I suppose, if so, I could start splitting hairs and say that, while the Monrobot XI and the IBM 650 were similar in many ways, the Monrobot XI was a much more modern generation in that it used solid state, where the IBM 650 used vacuum tubes. I vaguely recall there may have been a Monrobot XI and a Monrobot XI 2000, the latter having twice the system memory (rotating magnetic drum) as the earlier model. Those were the days. I recall boot-strapping in programs in machine language from the front panel! I loved that machine. I remember the delicious smell of the high quality oiled paper tape! [Some paper tape was oil impregnated, some was not). The thing came with a Fortran compiler. You loaded your source tape on one tape reader, then loaded in part 1 of the compiler, and an intermediate tape was output. Then you loaded that intermediate tape and part 2 of the compiler on the tape reader, and a compiled program paper tape was output. THEN you input the compiled program, and (if you were very very lucky), it ran. Everyone else including the teacher used Fortran ONLY. I did most of my programming on it in machine (not assembly... I hand assembled my programs) ... machine language. 15 years later I programmed a prototype "Bio-medical micro computer" that incorporated the JUST MONTHS EARLIER released Intel 8080 processor to examine electrocardiograms in real time (interrupt driven) and identify abnormal beats. I programmed it in machine language, too. Storing programs in 1702 EPROMs. Input was via 3 buttons cycling 7 segment LEDs, and a LOAD and RUN button. And an analog input for the EKG signal. Output was to EPROM programmer and to EKG strip chart. Damn thing actually worked, pretty much. As well as most other efforts back in 1975, anwyay. ---marty

5 years, 11 months

Great, my VT52 is shot.

by cz＠alembic.crystel.com

Wonderful: A few weeks ago I forgot to turn off my VT52 and left it running for a day or two. Now the screen is filled with snow and it looks like the text is all over the place horozontally. Any tips or thoughts on where to start looking to fix? The keyboard seems to be working as does the RS232 input (the snow on the screen changes when the pdp11 talks to it) Thanks! Chris

5 years, 11 months

PDF of FANUC TAPE READER A860-0056-T020 Manual Wtd.

by billdegnan＠gmail.com

Turns out the "The Director" tape reader I purchased last week was defective and I got a refund. So I thought I'd try my hand at the FANUC TAPE READER A860. I may need to make a serial cable (?) to connect from the internal connector don't know yet. Or maybe the internal 50-pin port >from the photos is for the punch. Don't know yet, thus the need for the manual. I checked bitsavers.org but there was no manual there, anyone here have a PDF or URL of the PDF for the FACIT tape reader A860-0056-T020? Thanks in advance. Bill Degnan

5 years, 11 months

Wanting some help with a PDP-8/a

by michael.99.thompson＠gmail.com

> > From: Bryan Longram <Driverless at protonmail.com> > Subject: Wanting some help with a PDP-8/a > > I acquired a non-functional PDP-8/A several months ago and in that time > I've replaced all the outwardly damaged parts and have gotten the machine > to power on with no issues. However the problem I've been having now that I > can't quite seem to pin down is that every time I power the machine the > address field is displayed as 07777 and the value field is displayed as > 7777. Attempting to change addresses or the value of the address doesn't > work as I can enter the value just fine but upon entering the Load Address > button it defaults back to being all sevens. I am in the process of repairing three 8/a Programmer's Panels. Two panels had bad ribbon cables. A good panel exhibited the same behavior as yours when used with the bad cables. I was able to cut the keying peg off two IDE disk cables to try as replacement cables. They IDE cables don't fit well, but do work. I will make new replacement cables for all three panels. -- Michael Thompson

5 years, 11 months

Has My VAXmate Flyback Transformer Failed?

by robert.jarratt＠ntlworld.com

I have been looking at the flyback transformer from my VAXmate. I think it could have failed but I can't be completely sure. I have posted a description here: https://robs-old-computers.com/2020/05/12/vaxmate-flyback-transformer/ Can anyone offer an opinion? Thanks Rob

5 years, 11 months

DS20E power supply question

by bob＠jfcl.com

I have a DS20E Alpha machine. It's pretty fully configured, with two 666 MHz CPUs, 4GB RAM and 4x10K SCSI drives. In other words, it's a real power hog. It has three power supply modules installed, and if I understand the configuration rules then at least two should be required to run the machine and the third is a hot spare. But, when do SHOW POWER at the SRM prompt, I get P00>show power Status Power Supply 0 * BAD * Power Supply 1 not present Power Supply 2 not present System Fan 0 good System Fan 1 * BAD * CPU Fans good Temperature good What? If I believe that then I have no functioning power supplies installed?!? At this point I should mention that the machine boots VMS and runs just fine. Obviously something is not telling me the truth. Does anybody know what would cause this? BTW, what do the red LEDs on the front of the power supply modules mean? Is LED ON a good thing (i.e. power OK) or a bad thing (i.e. fault)? FWIW, none of the LEDs on my three power supplies is on. Oh, and it's right about System fan #1 - one of the fans is not running. I don't know if it's seized up, or if it's related to the power supply issue. Thanks, Bob

5 years, 11 months

unibus scsi board

by aek＠bitsavers.org

mislabeled as qbus https://www.ebay.com/itm/143603725400

5 years, 11 months

Re: Looking for a pair of DEC RL02 drives, working or otherwise

by stephenbuck＠mac.com

Thanks for the lead David, I'll email him to see what he has. Steve

5 years, 11 months

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