test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cclist＠sydex.com

I don't recall ever seeing mention of this early French computer before. There's a great deal of photographic and documentary material here: http://pichotjm.free.fr/Serel/Summary.html Cheers, Chuck

18 years, 11 months

Free in L.A.: Box of DEC Power, Serial, Printer, Telecom Cables, Adapters, Labels, etc

by molists＠yahoo.com

I have a large apple box of about 30-40 official DEC molded cables, i.e. console and null-modem (db9-db25, db25-db25, db25-centronics), printer and extension, as well as some non-DEC, a lot of standard power cords, gender changers, DB25 and DB9 test plugs, also includes three early manual device switches: 4-way RJ11, 4-way DB25, 6-Way DB25, a few classic free toys from McDonalds, and an angry nun. There are also several Avery-Dennison packs of 3.5" floppy disk stickers for 8.5x11 sheet printers, and there may be a set of 5.25" stickers. You pickup. ____________________________________________________________________________________ Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html

18 years, 11 months

RL02 Fault, not where you might suspect it

by charlesmorris＠hughes.net

I'm back from vacation (a wonderful time, except that for a week in mid-June southern Europe had an amazing heat wave - 43C/109F during the day in SW Crete, overnight lows around 33C/92F. Rumor has it that Athens saw nearly 50C/122F!). I have resumed work on my 8/A - RL02 - OS/8 system that booted only once (on the second power-up a buffer on the M8315 CPU board which drove memory address bit 4 failed). I'd previously posted my adventures finding that 74367. Anyway having fixed that it still wouldn't boot. The drive would load and the READY light would illuminate, indicating that track 0 had been located. When flipping the BOOT switch, the head could be heard to move, then the FAULT light would go on and the boot loader would hang. I did find that the disk pack had developed a bad block at octal 100, so I remade the image on a new pack with no bad blocks. Same error. So I put the pack in the drive that made it (on my PDP-11/23+) and ran the cable over to the controller. Still no go. I keyed in a couple of short programs and couldn't read the Command Register B properly. Sending one (or a loop of) reset commands (6600 octal) to the drive did not cause the FAULT light to go out - only power cycling the RL02 would clear it. That told me the controller was not communicating with the drive at all. With a few more test programs and the controller on an extender card, it was easy to see that the reset command was not being received, although the IOT 660x signal was. It turned out that the TP3 signal (required for the reset, among many other functions) was low in amplitude, barely 2V at the Omnibus pin CH2 (the other CPU timing pulses TP1,2,4 are well over 3V). The input buffer on the controller card was not responding to this weak pulse. Working backwards, I arrived at the source (E27-6 on the M8315 CPU, a 74120 Pulse Synchronizer). There's a pair of these, E22/E27, driving TP1..4 onto the Omnibus. Nothing obviously fried, but the other three outputs showed about 750 ohms to ground (on my Fluke 73) and the defective one was 57 ohms. Before desoldering the entire chip I confirmed it was defective by lifting pin 6 and it still had very low resistance. So the source of the RL02 FAULT is apparently a bad driver chip on the CPU board. Not where I would have first suspected it. There may well be yet another bad chip, but one error at a time... now I have to lay hands on a 74120 before my next 4 week trip away from home (leaving Sun. 22nd). Would anyone have one or two 74120's that you could drop in the mail tomorrow (I'll be happy to pay for the chip and postage), or point me to a supplier? Neither Mouser, Digikey, Jameco nor Newark have them :( and Unicorn Electronics has a $20 minimum order. thanks for any help -Charles

18 years, 11 months

SGI Origin 2000 $600 OBO

by ethan.dicks＠gmail.com

SGI afficianados, Please contact the original poster, not me. AFAIK, the equipment is located in or near Columbus, OH. ---------- Forwarded message ---------- From: Scott Merrill <skippy at skippy.net> Date: Jul 13, 2007 9:18 AM Subject: [COLUG] SGI Origin 2000 To: Central OH Linux User Group <colug432 at colug.net> My former employer is looking to sell their SGI Origin 2000. If anyone is interested, please contact me off-list. Silicon Graphics Server 1 Origin 2000 DS 2xR10K195mhz 4 4 CPUs @ 195mhz XIO to VME Adapter, 6U 2 port Fibre Channel XIO Card XIO 4 Port 10/100 Ethernet Card Fiber Channel Vault Array 10 Slot Irix 6.4.1 OS 1 1000mb Network Card 24x CD-Rom Fibre Channel Cables 110 VAC Programming Terminal (crt is damaged however machine is operational) 10 18GB Fibre Channel Raid Disks 3 8.8GB FC Raid Disks 2nd FC Raid Vault 1 9GB Root System Disk 768MB ram Machine is fully functional, Fibre Channel, Raid, 4 port nic and GIGABIT. $600 OBO for the system above, it is definitely a workhorse! -- GPG 9CFA4B35 | skippy at skippy.net | http://skippy.net/ _______________________________________________ colug432 mailing list colug432 at colug.net http://www.colug.net/mailman/listinfo/colug432

18 years, 11 months

Great little slide show on memories

by cclist＠sydex.com

On the IEEE Spectrum web site: http://www.spectrum.ieee.org/jul07/5337 It'd be fun to have the book that's mentioned in the text. Cheers, Chuck

18 years, 11 months

TTL homebrew CPUs

by ed＠ed-thelen.org

Drifting from TTL homebrew computers into NE-2 relaxation oscillators - The year Sputnik went up - October 1957 - I built a Sputnik oriented Christmas tree ornament for my sister. The "earth" was 3" transparent plastic tube cylinder barely large enough to hold a selenium rectifier, small electrolytic capacitor, 47K resistors and disk capacitors. The transparent tube orbit had three support tubes, and contained the seven NE-2 gas tubes. I thought it cute but was disappointed that the start-up and operation was so unpredictable. Direction of rotation and number of satellites was variable. But my sister was delighted, and has it to this day - but it now goes on the tree only when I visit. Time has been unkind. The gleaming wires have turned ugly black, the plastic yellowed, the lamp cord dried and cracked, and I forget if it still works ... .

18 years, 11 months

Burroughs B220

by aek＠bitsavers.org

> I would be interested in getting some good pictures of one, especially the console. I just put a bunch of scans up under bitsavers.org/pdf/burroughs/B220/brochure that should give you a good idea of what the machine looked like.

18 years, 11 months

Bondwell Model 91

by marvin＠west.net

I just picked up a Bondwell Model 91 today, and have been unable to find any information about it on the web. A picture of it is at: http://www.west.net/~marvin/bondwell.jpg Anyone know anything about it? I am guessing it is part of an early televideo conferencing system since it has a camera mounted to the top. The "logo" on the bottom left says BWX compatible.

18 years, 11 months

UK computer history gets new home

by feldman.r＠comcast.net

Just seen on the BBC Web site (http://news.bbc.co.uk/2/hi/technology/6291422.stm): "Plans are taking shape to set up a museum that celebrates Britain's role in the origins of the digital age. The National Museum of Computing will be based at Bletchley Park where World War II code breakers built the first recognisably modern computers. The museum's centrepiece is the rebuilt Colossus computer that broke high-level German communications during WWII. The museum's founders are seeking funds and backers to exhibit more machines from its extensive collection. " <more> Bob

18 years, 11 months

3com 3c509b cards

by dgriffi＠cs.csubak.edu

I have a couple 3c509b ethernet boards for 16-bit ISA busses. Anyone want them? -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

18 years, 11 months

BCS at 50

by ljw-cctech＠ljw.me.uk

I've uploaded some photos from the BCS at 50 event at Bletchley Park today. http://www.flickr.com/photos/ljw/sets/72157600782178592/ It was a good day with interesting talks from Tony Sale, John Pether and John Harper. We got to see both the completed Colossus rebuild and the completed Bombe rebuild operating. Friday and Saturday the event continues in London. -- Lawrence Wilkinson lawrence at ljw.me.uk The IBM 360/30 page http://www.ljw.me.uk/ibm360

18 years, 11 months

Software for Transtronics/Intronics EPROM programmer

by pierre-detorcy＠wanadoo.fr

I own a backup of the disk for the Intronics pocket pgmer. Do you still need it ?

18 years, 11 months

Useful Information

by Billy.Pettit＠wdc.com

Al recently posted a useful manual for collectors. It is called the Fujitsu Sales Prospector 1986. I say useful because it contains a summary of all the industry's storage peripheral products available in 1986. Basic specs and some detailed specs on units. So, for example, if you need to know the differences between different Rodime hard drive models, that data should be there. At the end are several Fujitsu data sheets, on 5.25" and 8" hard drives and the 243X tape units. A handy manual for high level data on the state of the industry at that time. Billy

18 years, 11 months

Looking for 5251 manuals

by fireflyst＠earthlink.net

Hi all, I'm looking for the switch settings and/or a service manual to indicate what the switches on the back of my 5251 do. Anyone have this data? Thanks Julian

18 years, 11 months

TTL homebrew CPUs - OT radio

by ajp166＠bellatlantic.net

> >Subject: Re: TTL homebrew CPUs - OT radio > From: woodelf <bfranchuk at jetnet.ab.ca> > Date: Wed, 11 Jul 2007 14:52:31 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Roy J. Tellason wrote: > >> Since a lot of parts like UJTs aren't ax commonly available as they used to be >> I poked around some and found stuff online as to how one might "make" one >> using a complementary pair of transistors. Couple each base to the other >> one's collector, and you have an SCR, an SCS, or a PUT, depending on how >> you wire it up. Not all that much difference between them... :-) > >Well I found this surfing last night. Fet + Pnp = Strange radio. >http://www.schmarder.com/radios/solidstate/homodyne.htm > That is a simple DC coupled amp that is used to first amplify RF then the detected audio is passed through again. The fet is for high input impedence and the transistor is for increased gain. Other wise know as a reflex receiver. Allison

18 years, 11 months

VCF/Midwest 3.0 - this weekend - July 14/15!

by pat＠computer-refuge.org

There's just a few more days left until this year's Vintage Computer Festival / Midwest. So, come and see all of our excellent exhibits put on by computer collector hobbyists, listen to our speakers talking about vintage computer topics, and relish in the nostalgia by buying/selling/trading your own old computer gear at the VCF Marketplace at the event! VCF/Midwest 3.0 will be July 14-15, at Purdue University's Stewart center. Speakers will run from 11a to 2p each day, and exhibits and the marketplace will be open from 2p to 6p. Admission is $5 per day for access to the whole event, and kids 17 and under get in for free. For more details, and to sign up as a last-minute exhbitor or vendor, please see the official VCF/Midwest 3.0 website at: http://www.vintage.org/2007/midwest/index.php If you have any questions, feel free to send me a message at: vcfmw at computer-refuge.org. This year's VCF/Midwest is being sponsored by the Rosen Center for Advanced Computing at Purdue University - http://www.rcac.purdue.edu Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

18 years, 11 months

Looking for Eagle symbols for 2901 / 2911

by jos.mar＠bluewin.ch

If anybody has anything of the above, I would be interested. Jos

18 years, 11 months

VCF/MW dinner

by pat＠computer-refuge.org

Anyone who's coming to VCF/Midwest and wants to meet up for dinner on Saturday, drop me a message tonight or early tomorrow. I want to get an estimate of how many people we're going to have, so I can potentially make a reservation. So, if you'd be bringing someone with you, let me know that as well. Thanks, Pat -- Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

18 years, 11 months

CP/M for DEC VT-180?

by david＠marmotking.com

I stumbled across a very old post you made asking for CP/M disks for a VT-180. Did you ever find them? I know this is a REAL shot in the dark. I can't seem to locate them anywhere. I was able to find all the pieces to upgrade a VT-100 to a VT-180.

18 years, 11 months

Victor 9000/Sirius 1 restoration questions

by jzg22＠drexel.edu

I have a Victor 9000 I'm restoring here, and I have a few questions: 1. Where do the two plugs for the 5 1/4 drive heads connect? This system has the Universal bios, a 10MB winchester HDD with DOS 3.1x and the later 1.44MB GCR/MFM floppy installed, but I can only seem to get one of the drive heads working (using catweasel on PC to dump a 'formatted' disk afterwards results in clear data spikes on one side and the other side blank, and format.exe won't format disks properly unless given the /1 1-sides flag) 2. The victor 9000 does NOT say anything when I turn it on. I know the Sirius 1 did, but I'm not sure the Victor does. Is this normal, or does the system need the HC-55564 delta modulation chip replaced? 3. Does anyone have a schematic or service manual for the victor 9000/sirius 1 anywhere? I also discovered that both of the victor keyboards I have need re-foaming between the contact discs and key plungers, which is gonna be a whole bunch of fun to do.</sarcasm> They also both need new snap-tabs on them as both of the tabs have the tooth broken off (though they work fine other than having to hit keys really hard and the cord occasionally falling out of the computer) Jonathan Gevaryahu jgevaryahu(@t)hotmail(d0t)com jzg22(@t)drexel(d0t)edu P.S. Does anyone have dumps of the older BIOSes for the system? The universal one is the 'last' one of at least three I know existed. More than one version of the universal one may exist. The one I have is labeled 'V9000 UNIV. FE F3F7 13DB' and 'V9000 UNIV. FF F3F7 39FE' with respective crc32s of 25C7A59F and 496C7467 for each ROM. The sum16s match the last part of the labels, i.e. 13DB and 39FE. P.P.S. does anyone have documentation for the winchester disk controller it used? I'm trying to make a raw binary dump of the hard drive, preserving partition tables, information, etc. and the only way I can see of doing it is to use BASICA to poke and peek at the proper memory addresses to make the disk do its thing.

18 years, 11 months

Burroughs Terminal info

by stevew＠ka6s.com

Hmmm - the MT985 likely uses a polled protocol at RS-485 levels. It wants to hook up to the B1955 Multi-line controller fer instance. You would hang a bunch of these on a multi-drop line. The Multi-line would throw-out a poll sequence and get either an ACK or NACK from each terminal on the line. If the ACK happens, the terminal is then told to send in a block of data. If memory serves - it has 3 separate micros in it, and the software running on it was written in Pascal. These came out around 1981-2. Steve Wilson (worked on the B1955/B1965 design)

18 years, 11 months

Need docs for Burroughs term (Jason T)

by alanp＠snowmoose.com

>>Being Burroughs, it may be VERY WEIRD. Sort of somewhere between smart >> (IBM) and dumb (DEC). It will probably only want to talk to a >> Burroughs. > >Hey, I like weird! But yeah...I'm getting the impression from the >manual this is not an ordinary serial term (though it does have an EIA >interface.) I don't think it emulates anything, except maybe other >Burroughs terms. It has been almost 20 years since I used that stuff, I did work on Burroughs on mainframe-PC integration and terminal subsystem stuff for three years, so I should remember some of it, shouldn't I? Almost no one was using MT-985 when I got there in 86. We all had ET-1100s and ET-2000s (a Burroughs PC clone that was also a Burroughs terminal). I don't recall them having any dumb serial terminal capability. It was a block mode terminal where the mainframe application would send down the form (a mix of text and formatting codes) in one chunk and the terminal would display it, then the use would fill in the fields and send it back to the application in a block when the user hit the transmit key. Electrically, we always used a two-wire interface (TDI or Two Wire Direct Interface). I recall that the connector was a DB-25, but only two pins were used, but that could just be bad memory. The protocol used to communicate with the terminals was called Poll/Select. It was half duplex. The terminal processor (can't remember what those were called in Burroughs-speak) would go through the terminals attached to it and query them to see if they had anything to send and, if a terminal did, it would. Given how hard it is to find info on Burroughs stuff these days, I wish that had saved more stuff when I left. alan

18 years, 11 months

Symmetric 375

by aek＠bitsavers.org

Just checked, all of the files on ftp.berklix.com are gone Bernd Kopriva is on the list, hopefully he mirrored it. Dumping the boot proms would be a good thing.

18 years, 11 months

trace wrinkles

by dgriffi＠cs.csubak.edu

I haven't heard anyone discuss this yet: what causes traces on some old PCBs to wrinkle and not others? My guess is a combination of suboptimal glue and wide temperature swings. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

18 years, 11 months

Need docs for Burroughs term

by dm561＠torfree.net

------------------- Original Message: Date: Tue, 10 Jul 2007 20:47:36 -0500 From: "Jason T" <silent700 at gmail.com> Subject: Need docs for Burroughs term I've just picked up an old Burroughs terminal, model# appears to be MT-985, and I'm having trouble finding documentation for it. It came with a manual for the ET-1100 model which provides some clues, but the key sequences to get into the setup for baud rate, etc appear to be different. Anyone have any experience with these? It's a cute little terminal and the keyboard has a key lock on it - never seen that before. ----------------- Reply: Can't help with the MT-985, but if it's anything like its TD700/800 predecessors it probably had various interface options; the TD's could be configured for RS-232/BDI async, sync, IBM bisync or multipoint, and could also have cassette drives, a mag card reader and/or a printer attached. In case anyone has one, I do have tech manuals and some parts for the TD700 & TD800 terminal series. mike

18 years, 11 months

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