test-drb July 2007

test-drb@ccmp.vtda.org

189 participants
323 discussions

Tandy 1000EX in Craigslist, Morgantown, WV

by us21090＠yahoo.com

I'm not associated with this person. See: http://morgantown.craigslist.org/sys/366079794.html Reply to: sale-366079794 at craigslist.org Date: 2007-07-03, 8:07PM EDT Tandy 1000EX [8086 processor] purchased in 1985, I think. Has dot-matrix printer; mouse; joystick; 1200 baud modem; internal and external 5 1/4-inch floppies plus an external 3 1/2-inch floppy. Monitor and stand. Games and other programs. I hate to just throw it away or e-cycle it. Pic available on request. Make an offer. ____________________________________________________________________________________ Shape Yahoo! in your own image. Join our Network Research Panel today! http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7

18 years

Serel 1001

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

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

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

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

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

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

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

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

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

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test-drb July 2007