test-drb

test-drb@ccmp.vtda.org

101090 discussions

by sales＠elecplus.com

https://elecshopper.com/Sun-501-5401-256MB-PC100-232-pin-ECC-3-3V-DIMM-p1472 53154 I got a better deal on it, so the price is lower. New ecommerce platform, very fast checkout, under 2 minutes! I still have a VERY long way to go to get everything loaded again. Damn hackers! 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

6 years, 8 months

PDP 11/34 systems available in CA

by jwsmail＠jwsss.com

I have three PDP 11/34's available in the LA area for sale.? i have two full systems, plus? a system with 2 RL02s, and a TU10 tape drive. I'd like to sell all of them.? There is an extra RL02 as well.? All for pickup, or freight drop. please reply off list.?? I have $2000 in the lot. thanks jim

6 years, 8 months

RS2030 MIPS workstation

by pmackinlay＠hotmail.com

I?ve only just joined cctalk, so apologies for the delayed response to this query from May, but I thought the information might be useful to others in future. I?m the person working on emulating MIPS workstations in MAME recently, and I?m a fair way through getting the Rx3230 model to a fully working state (Rx2030 is already working as of last month). For the MIPS Rx3230 systems, which use an M48T02, the mac address should be in the first 6 bytes of NVRAM. You can read/write the NVRAM through the boot monitor using the ?g? (get) and ?p? (put) commands. You also need to provide the ?-b? argument to specify byte width, and the relevant address. The NVRAM is mapped at 0x1d000000-0x1d001fff in the physical address space, but must also set the high bit to access it through kseg0. Each 32-bit word in that range corresponds to a single byte in the NVRAM, so the resulting commands will be something like: * g -b 0x9d000003 (read first byte of NVRAM) * g -b 0x9d000007 (read second byte of NVRAM) * ... Or conversely: * p -b 0x9d000003 0xff (write 0xff to first byte of NVRAM) I haven?t tried to decode the rest of the NVRAM for the Rx3230 at this point (although most of the monitor variables seem to be at offset 0x600-0x6a7), but at least I can see those are the bytes that are read from NVRAM and then written to the mac address of the LANCE, and setting them to a valid address makes the network layer in MAME behave as expected. -- Pat.

6 years, 8 months

Current MANX location

by jnc＠mercury.lcs.mit.edu

Wasn't MANX supposed to be coming back up after moving? Did that never happen? Noel

6 years, 8 months

Tape History - Freeman Reports

by t.gardner＠computer.org

Hi I'm sure some of us all remember Freeman Reports as the chronical of the tape industry well into this century. Ray Freeman and his partner and successor Bob Abraham published these reports from at least 1983 until 2007 but with Bob's death in 2007 the reports and backup files apparently wound up in a dumpster. But Ray, Bob and Jim Porter did exchange copies of their reports so thanks to Jim the Computer History Museum has almost all of the Freeman Reports in their permanent collection. There appear to be a few copies missing from the collection. A complete list of what the museum has and what maybe missing is posted at http://mrxhist.org/tom94022/FreemanRpt.pdf. In summary what may be missing are: Computer tape outlook - . half-inch products: 1994, 1985, 1990 & 1992 Computer tape outlook - . cassette/cartridge: 1984 & 1985 Computer tape outlook - all tape: 1997-2000 (as the market consolidated towards LTO so did the reports J Optical data storage outlook: 1985, 1988 & 1998 Mass storage/Library storage outlook: 1992, 1993, 1997 & 2000 So before they all get trashed please look and see if you happen to have any of the possibly missing editions in your garage, attic or any other repository. Contact me off line if you can help. Tom

6 years, 8 months

S/23 machine update card

by drb＠msu.edu

Folks, I've determined that the piece of my S/23 that's causing the power supply to blow its 12V fuse is the machine update card. The manual says this provides additional R/W storage for microprogram updates. That sounds like something that wouldn't be necessary for normal operation. Questions: 1. Can anyone confirm that I'm not losing anything by just pulling this? 2. Anyone have a cross ref for the IBM house numbers on these chips? 3. Anyone have a spare card they'd part with? 4. As long as I'm dreaming, anyone have a set of BRADS floppies or images? Machine update card photo: https://sysovl.info/pages/galleries/ibm/s23guts/s23guts13.jpg Interestingly, the underlying PCB for this seems exactly the same as the one for the word processing feature card. Many thanks, De

6 years, 8 months

multi-section cap for Tek 4006

by fritzm＠fritzm.org

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 dummy load on the +20V supply per recommendation in the service manual.) The cap in question is a multi-section Mallory can, 150 at 400 / 150 at 250, used to filter the +185 and +320 unregulated supplies. It is C395 A/B on the schematics, Tek part 290-0549-00, Mallory part 68D20193. This terminal is so beautifully engineered inside that it would be a real shame to replace this with some sort of ugly bodge. Any part-sourcing gurus out there able to steer me in a good direction here? I have found the part listed in the various online NSN aerospace cross-referencing sites, but haven't bothered to ask for a quote from any -- I'm guessing cynically that "RFQ" + "Aero..." = 5 zillion dollars for one piece... :-) Has anybody here used one of these sites successfully? cheers, --FritzM.

6 years, 8 months

I need a keypunch (briefly)

by cctalk＠ibmjunkman.com

The Computer Museum of America in Roswell GA (400 miles) has 2 working 029s. Don?t know the condition of the ribbons. Contact Lonnie Simms via info at computermuseumofamerica.org. Tell him his CA IBM benefactor sent you. I hope you have black cards. If not, let me know. Otherwise you could try http://www.kloth.net/services/cardpunch.php and print the JPEG on heavy stock. Donald Date: Wed, 7 Aug 2019 18:10:32 -0400 From: Chip Davis <chip at aresti.com> To: cctalk at classiccmp.org Subject: I need a keypunch (briefly) Message-ID: <5c1abccc-5548-057d-fa0c-0b6be9d0c2c8 at aresti.com> Content-Type: text/plain; charset=utf-8; format=flowed I was referred to this group by dave.g4ugm at gmail.com who thought you might be able to help me. I need to punch a half-dozen datacards for an award for a retired IBMer. Anyone know where I can find a working 026/029/129 within 300 miles of Raleigh, NC? Many thanks for any pointers. Chip Davis chip at aresti.com +1.919.271.2582

6 years, 8 months

ADM-3A question

by charlesmorris800＠centurytel.net

Tried the ADM-3A out today on my PDP-8/A via the 20 ma current loop interface - just unplugged the ASR-33 and plugged in the glass TTY :) Worked great (the current loop probably had never been used, so no one had a chance to blow it up), but I got tired of holding down the Shift key since OS/8 doesn't understand lower case letters. So I decided to set its switch to upper case only... terminal kept putting out lower case. Sure enough, that switch contact was stuck closed. It'd probably never been moved since the terminal was new! Now waiting on a 6-position dip switch from Mouser. And some 8-position Mate-n-Lok connectors. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

Grid 1537 ”Tempest” schematics

by curt＠atarimuseum.com

Hi, I?m doing some work for a friend who has one of these unicorns it?s apparently a super beefed up CIA use the laptop that wound up in Russia somehow and he got it shipped back here to the US The motherboard was modified it looks like the hard drive was on some kind of a tray going to a connector which is IDE compatible Someone had extremely poorly soldered on an IDE cable in place of the sled and over the years several of the pans of popped off and they?re not really making sense as to the solder points they?re supposed to go to. Complicating the matter is the paint outs are not just a direct staggered 40 Pin to Pin connection several of the through holes are not in use so just soldering on I had her and plug in the cable into it is not possible also the pens are staggered so that wouldn?t make it possible either. So to cut to the chase does anyone have the schematics or the motherboard pinouts for this connector so that I can do a proper soldering job and put on a clean working cable so that this laptop can vote from the IDE hard drive?

6 years, 8 months

HP-2250 in Salt Lake City

by Tim＠Rikers.org

Someone on this list, I don't remember who, asked me if I was interested in this, and then dropped it off. I've not gotten around to doing anything with it, and I could use the space back. If anyone is interested, holler. HP 2250 Measurement & Control Processor Pictures are the same ones that came with it. Photographer unknown. https://photos.app.goo.gl/XjEj8E8vQ8KX9xcg8 If your interested in picking it up, email me directly, please. If you have more information to share, respond to the list. :) If anyone knows more about what this is, I'd be interested to hear. I got these links from Mike on the SIMH list: http://www.hpmuseum.net/display_item.php?hw=986 http://www.hpmuseum.net/document.php?hwfile=5124 http://www.hpmuseum.net/document.php?hwfile=4579 Mine is the "2250M" version. Apparently this heavy beast is "mobile" because it has wheels on it. :)

6 years, 8 months

Pinout for current loop interface

by charlesmorris800＠centurytel.net

>I've never heard of people using DB25 for 20mA, at least historically, contemporaneous with its widespread actual use. E.g. DEC universally used 'flat' 8-pin Mate-n-Lok connectors for 20mA serial connections. Thanks for the comments... I asked mostly because the ADM-3A has both RS-232 and current loop interfaces built-in (on the same female DB-25), selected by one of the DIP switches. I just hate having to make a custom cable for every terminal and computer I own or work with ;) -Charles --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

Archiving information, was Re: ADM-3A question

by jnc＠mercury.lcs.mit.edu

> From: Steven M Jones > imagine that a law is passed in a far away land, and the site owner > decides it's is too risky to bother with, and they then take the entire > site down - wiki and fora - with no warning and no access to the > material... > .. > I would strongly suggest that if people are going to do something of > the scale you describe, they might want to consider setting up a > distribution or replication mechanism Past events have made me very concerned about this issue! On a couple of occasions, Tore (who runs the CHWiki) has forgotten to pay the DNS fee, or something similar, and it went off-line (the first time for a week, as he was off camping). Leading to total panic on my part when he wasn't reachable, about all the content I'd written! There is an automatic backup system which sends copies to a machine at his house, so the particular scenario above (hosting sevice goes away with no warning) is not an issue. (Yes, a Chicxulub event in Scandanavia would defeat that, but we'd all probably have larger problems to worry about!) After the first event, I make manual backups here of all the articles I contribute. The biggest concern is if he has an unfortunate interaction with a truck. I did raise this issue with him, and he had some initial suggestions, but I haven't followed through. If people start contributing, it'd probably be time to formalize something. Noel

6 years, 8 months

Pinout for current loop interface

by jnc＠mercury.lcs.mit.edu

> From: Charles Morris > Is there any standard pinout for 20 ma current loop using a DB-25 > connector, analogous to the well-documents RS-232 serial interface? > ... > Or would you recommend I use a different connector entirely? .. Maybe a > Jones 4-pin would make more sense. I've never heard of people using DB25 for 20mA, at least historically, contemporaneous with its widespread actual use. E.g. DEC universally used 'flat' 8-pin Mate-n-Lok connectors for 20mA serial connections. Although I have the part numbers for both the male and female 8-pin shells, they are no longer in production, and are getting hard to find. Nothing precludes us from establishing a spec for 20mA via a DB25, of course - especially if a set of pins can be found whih will not cause damage if such a connector is plugged into an EIA connector by accident. As 'idiot proof' engineering, I'd be inclined to use some other connector (no suggestion from me as to what), but I can understand that people might prefer to use DB25 (which everyone has, and are easy to find). Noel

6 years, 8 months

VAX DATATRIEVE orange binders (4)

by toby＠telegraphics.com.au

Hi, I have four binders, pictured here: https://imgur.com/a/w9a3YEY * Reference Manual, AA-K079E-TE * Guide to Writing Reports, AA-P862C-TE * Handbook, AA-W675B-TE * User's Guide, AA-K080E-TE Did not see scans on bitsavers but it's possible I just overlooked them. Is there any interest in getting them scanned? I have a suitable scanner. I can also ship them (from Toronto, Canada) to anyone keen enough to pay shipping. --Toby

6 years, 8 months

Archiving information, was Re: ADM-3A question

by jnc＠mercury.lcs.mit.edu

> From: Seth J. Morabito >> having stuff scattered across a zillion personal pages (be they blogs, >> or whatever) is going to make it hard to find the useful one when >> needed > The sheer vastness of content available, combined with a Google > monoculture, combined with a concerted attempt to GAME the Google > monoculture, is making search and discovery hard An additional issue, I think, is that Google is deprecating sites that use HTTP, versus HTTPS. I can't comment more, lest I start ranting at the utter stupidity of forcing everyone to use HTTPS. But if those blogs are using HTTP, that will push them down the results. > I honestly don't know what to do about it. I don't have a better idea, > unless we go back to something like a directory-style curated > experience, a-la Yahoo! circa 1998-ish. I'm not sure that would scale to cover detailed pages on obsolete computers; why is a manual indexer going to cover them? Anyway, the whole 'how do we find the info' is a part of why I started working on CHWiki, once I discovered it - in addition to the usual advantages of wikis (good for collaboration, good for adding stuff incrementally), it would put all the info in one place, a 'one stop shopping' for old computer info. But when I tried to convince people to post stuff there, instead of on their blogs, I got at least one person who was pretty vehement that no way in h*** were they going to stop putting their stuff in their own blog. Noel

6 years, 8 months

Pinout for current loop interface

by charlesmorris800＠centurytel.net

Is there any standard pinout for 20 ma current loop using a DB-25 connector, analogous to the well-documents RS-232 serial interface? My PDP-8/A drives an ASR-33, and having just restored an ADM-3A I want to be able to unplug the TTY and plug in the ADM. I somewhat arbitrarily put the transmit data + on pin 2 and receive + on pin 3, and picked two uncommitted RS-232 pins for the - legs of both loops. The ADM-3A receives on pins 23 & 25, and transmits on pins 24 & 17. Polarity doesn't matter since both pairs use bridge rectifiers. If this is some kind of de facto standard, I'll change the bulkhead connector on the PDP-8 and the TTY to match. Otherwise I'll just make yet another unique cable to hook up the ADM-3A to the PDP-8 as it's wired. Or would you recommend I use a different connector entirely? The reason I used the DB-25 to begin with is that I had a DEC rack-mount plate that already takes one. Maybe a Jones 4-pin would make more sense. thanks for any tips. -Charles --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

GW-DEC-1: A New DEC Prototyping Board

by jnc＠mercury.lcs.mit.edu

> From: Brent Hilpert > I've seen pieces of HP high-end lab equipment from thru the 60s that > used tin plating on the PCB edge fingers, mating into gold-plated edge > connectors on the backplane. ISTR that DEC used bronze contacts in their backplanes, but basically all the boards had gold-plated fingers. (I think I've seen a few power supply boards that had tinned fingers.) I think the bronze was preferred since the contacts bend back and forth as cards are inserted/removed, and bronze is more durable; and being part tin, has the same corrosion characteristics are the tin. Noel

6 years, 8 months

RXV21 questions

by dj.taylor4＠comcast.net

I have 2 RXV21 RX02 controller boards.? They were bought to be used with the RX02 emulator, the one on github by AK6DN. Finally, I finished one of the emulator boards and tried it out on a PDP-11/03 and found that one of the RXV21? boards worked and the other didn't.? I assumed the one board was bad. Yesterday I tried the RX02 emulator in a BA23 with a 11/53 cpu (I also tried a 11/23+) cpu.? What I found is that the one that worked in the 11/03 didn't work, while the other board kinda worked.? I could do a DIRECTORY and DUMP from RT11, but I couldn't boot the RX02 in the microPDP-11. Today I ran into Chuck Dickman's web site that talked about the Etch versions of the board and which would work in a microPDP-11. He showed how to convert an Etch 'D' board to work in a microPDP-11. I have Etch 'C' - this is the one that works in the 11/03, and an Etch 'D'.? My 'D' board isn't exactly like the 'D' board he shows. What are the changes to the 'D' board that he outlines?? What is exactly the reason why the 'C' works in the 11/03 and why an 'F' or modified 'D' is needed for the microPDP-11? Doug

6 years, 8 months

ADM-3A question

by charlesmorris800＠centurytel.net

Today the replacement 'LS193 arrived, so I put it in the previously-installed socket and the screen is now 24x80 again :) I'd been testing with the dip switch in half-duplex mode... For final test, I put it in FDX, connected to my HP protocol analyzer, and what do you know, no serial data out. The 1488 RS-232 driver was blown (TTL-level data going to it, but the RS-232 line was stuck in spacing). Not an uncommon failure with static discharge and incorrect cable hookups... I destructively removed it, again installed a good dip socket, now waiting for THAT chip (a variety of other line drivers in my drawer, but not 1488/1489). Meanwhile I noted another slide switch S8 ("GT/LK") near the DB-25 connectors. It is not referenced anywhere in the documentation, nor in the schematics! The wiper of the switch also goes through a hex inverter to a 74LS32 chip, ALSO not in the schematic or circuit description. This signal originates at the flip-flop that generates KBLOCK\. Finally, input pin 10 of the removed 1488 is supposed to be tied to pin 9, with the RTS output on pin 8. But pin 10 goes In fact, the PCB artwork at the end of the tech manual shows no connections except +5 and ground to that chip (position C2 I think), and it doesn't show the slide switch either. This is likely something for the auto-tester that LSI used to check these boards on the production line, although I don't know if the extra circuitry was added or removed during production. Anyone have internal documents on this? I'm just curious since it only appears to affect the keyboard lock functions which I'm not using anyway. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

Archiving information, was Re: ADM-3A question

by jnc＠mercury.lcs.mit.edu

> From: Eric Christopherson >> Anyway, the whole 'how do we find the info' is a part of why I started >> working on CHWiki, once I discovered it > Psst: it would've been a good idea to share the URL to CHWiki. Well, that passing reference wasn't an attempt to get people to go look at it, hence no URL! :-) I was focused on the abstract discussion about 'how do we make information accessible, if relying on search engines to find blog postings doesn't work'. I have on several occasions posted appeals to this list for people to contribute content to it, and gotten almost no response (with one notable exception), in terms of added content; that was a large part of why I merely mentioned it in an offhand way. > a site I was already familiar with, but not under the name you used for > it. Ah, formally it's the 'Computer History Wiki', except that's a lot of typing, so I've been using 'CHWiki' as a short, easy-to-type, name for it for some time now. > (It was a bit hard to find with Google, which just goes to show...) Yeah, I added "CHWiki" to the text on the Main Page to make it a little easier to find from the short name, after a previous case where I'd used that term here, to some people's confusion. But I see it still doesn't work well; I guess I'll have to add 'CHWiki' links from more pages. Using 'Computer History Wiki' as a search term only works slightly better, though; it's at the bottom of the first page of results for me, below a bunch of Wikipedia links. Noel PS: In response to a point raised in a private reply to me; the site is for _all_ historical computers: personal computers, mainframes, the lot. I myself have added a lot of PDP-11 material, but only because I'm very fond of them, and know them well. The field of historial computers is _way_ too broad for one person to cover in depth, which is part of why I previously appealed to people who knew/were familar with other corners of it to add detailed content in those areas.

6 years, 8 months

Google site ordering (Was: Archiving information)

by jnc＠mercury.lcs.mit.edu

> From: Christian Corti >> An additional issue, I think, is that Google is deprecating sites that >> use HTTP, versus HTTPS. > Not true, in contrary, Google even crawls through FTP sites :-) I did say "deprecate", not 'ignore totally'! :-) Here's what I know: An e-commerce site where I do a lot of business announced that they would switch to using HTTPS. I grumped, because I'd have to use a browser I don't like as much. The owner wrote back as follows: "next month Google will begin to demote all websites that are not https secure" I assume he knew what he was talking about (via his Web-site engineering people). I suppose I could research it, but I don't have the time right at the moment. I'd love to hear if anyone else knows more. Noel

6 years, 8 months

ADM-3A question

by charlesmorris800＠centurytel.net

I found a newer version of the tech manual on bitsavers, which does mention the mysterious S8 switch (as well as the S6 switch that fills the screen with 0's upon clearing). "The gated EXTENSION port mode, when selected by switch S8, allows selective transmission of data from the keyboard, in Half-Duplex mode, or the communication line through the EXTENSION port. GT: Enables gated EXTENSION port mode which allows ON/OFF control of the EXTENSION port. LK: Disables gated EXTENSION port mode which allows locking and unlocking off [sic] keyboard." The wiring is on the newer schematic, too. Another of life's little mysteries, solved :) --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

GW-DEC-1: A New DEC Prototyping Board

by systems.glitch＠gmail.com

Connor Krukosky and I have been working on laying out a new quad-height DEC protoboard, which can also be sheared down into a dual-height board. Full announce on the VC Forums: http://www.vcfed.org/forum/showthread.php?71177-GW-DEC-1-A-New-Quad-Height-… These should be available within a month or so. I'll be putting up a preorder soon to gauge interest in the production run, which as usual will have hard gold plating on the edge connectors. I haven't gotten a quote for the cost, but I expect them to be $30-40 each for production boards. They'll be available at VCF Midwest as well as online! Thanks, Jonathan

6 years, 8 months

cctalk Digest, Vol 59, Issue 13 (Curt Vendel)

by michael.99.thompson＠gmail.com

> > Date: Wed, 14 Aug 2019 12:06:48 -0400 > From: Curt Vendel <curt at atarimuseum.com> > To: cctalk at classiccmp.org > Subject: Re: cctalk Digest, Vol 59, Issue 13 > > Will... > > I?m still waiting for you and the Rhode Island Computer Society to get my > brand new in the box 9766, the Alignment disk platter, the box of spare > heads and the other unit 9766 beat up unit up and running that I gave you > to donate to RICS for free in exchange for you reading the dozen 300mb > platters I have and then once the data was read they could keep the > platters... > > So still waiting on that... hint hint hint > There are two vintage computer groups in Rhode Island, The Rhode Island Computer Museum <http://www.ricomputermuseum.org/>, and the Retro-Computing Society of Rhode Island <https://www.rcsri.org/>. In this case, Curt is talking about the Retro-Computing Society of Rhode Island. -- Michael Thompson

6 years, 8 months

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