test-drb September 2008

test-drb@ccmp.vtda.org

220 participants
323 discussions

Free kit in London, UK: 5.25" FH SCSI drives, PC-AT case etc.

by lproven＠gmail.com

I am trying to have a clear-out! Anyone need some 5.25" full-size full-height SCSI drives? I have an old 486 Netware server with 3 or 4 in - 1 x 9GB, 2 or 3 ~3GB, I think. There is also a stand-alone JBOD disk cabinet with 7 x ~1.5GB disks + 4 Toshiba caddy-loading CD-ROM drives; all are accessed across 2 x SCSI2 HD connectors on captive drop cables. There is also an original IBM PC-AT case, in IBM tower adaptor, with the original PSU and 3.5" FDD fitted. The motherboard is an MSI thing with a Pentium 133MHz and 128MB of RAM. It also has an Adaptec SCSI card with a Panasonic PD optical drive/CD reader. Finally there is an Elonex WS466 network workstation. This is an ultra-low-profile 486 network workstation (2"*10"*10", 4cm*27cm*27cm). I think it's a 486DX2/66. 2xRS232, 1xParallel, 1xSVGA, 1x10base-T. No internal expansion, no optical drive bay - it's too small. Happy to ship anywhere if you pay the postage. -- Liam Proven ? Profile: http://www.linkedin.com/in/liamproven Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508

15 years, 8 months

Assist finding EOL / Disc IC socket

by tonym＠compusource.net

If anyone has access to companies that have obsolete electronics and IC parts, I need some Molex 50-39-5288 28-pin IC Carrier, I'd take a few hundred, up to 1000, price dependant. Molex stopped making these about 2004, I think the guy said, and no longer makes IC sockets. I've been going through a few of the online places, but no luck yet. Hopefully someone has some contacts to ask... Many thanks! Tony

15 years, 8 months

VCF East 5.0 schedule and more details posted

by evan＠snarc.net

Hi all -- More details are posted at http://www.vintage.org/2008/east/. Lectures will be both days from 10:30 AM to (about) 1:30 PM. Saturday, the exhibit hall will be open from (about) 1:30 PM until 6 PM. Sunday it closes at 4:30 PM. A few more exhibits will be posted in the next few days, so keep checking back! - Evan

15 years, 8 months

Basic Principles of Vacuum Tube Logic Circuits

by wbblair3＠yahoo.com

After a _lot_ of downloading and reading, I've compiled excerpts from the best tube logic theory technical documents I've found on Bitsavers and uploaded it as a merged document here: http://www.scribd.com/doc/5484436/Basic-Principles-of-Vacuum-Tube-Logic-Cir… I've included two pages on the IBM 650's capacitor memory just because the concept is so cool to me: a tube written, refreshed and read array of 500pF caps. I wish I could find a more detailed description of it. If anyone knows of other documents on Bitsavers or elsewhere that contain quality stuff on the tubular logic topic, please let me know and I'll add excerpts from them.

15 years, 8 months

CDC/VAX tapes and drives

by ekklein＠pacbell.net

Got this in the mail but the tape systems aren?t of interest to me: --- Found your name on a website related to antique computers and components.??There are some vintage items at our company that we will be discarding when we move to a new location so I am contacting you to see if you have any interest.? We have reels of tapes and tape drives that can read tapes written on VAX and CDC systems.? We also have cabinets for hanging reels of tapes.? There is other stuff around too like old PC systems and software that we are just beginning to go through.? So let me know what you are interested in.? Also if you are not interested in the tapes or tape drives do you know anyone who is?? I'd rather give them to someone who wants them then to send them to the recycler. --- If you are interested please drop me a line and I?ll forward the contact info. ----- Erik Klein www.vintage-computer.com www.vintage-computer.com/vcforum - The Vintage Computer Forums marketplace.vintage-computer.com - The Vintage Computer and Gaming Marketplace

15 years, 8 months

vac tubes / was Re: Schematics of Atanasoff-Berry

by wbblair3＠yahoo.com

Brent Hilpert wrote: > Joking aside, and I don't want to speak for William, > but I think at this point his project is in the > experimental stage .. whatever is at hand will do. You are right on the money. To be done with what I have on hand as much as possible since my success in this effort is far from guaranteed. Right now, we're not talking about anything more ambitious that a demo circuit using five tubes.

15 years, 8 months

vac tubes / was Re: Schematics of Atanasoff-Berry

by wbblair3＠yahoo.com

> > Can't get much cheaper than effectively free for a > well regulated, high current DC power supply using a > modified PC power supply that isn't otherwise being > used. Plus, the idea of using tubes with 5V filaments > instead of 6.3/12.6V reduces the competition with typical > audio tube customers and makes the use of a high-current > 5VDC supply possible. > > For a few bucks, you could get a 5 Volt transformer with a > decent > current rating of 10 Amps, and not have to worry about the > number of > tubes you need to feed for a while. > > Filament transformers come in many voltages other than 6.3. I'm just working with what I have on hand. And I plan to use the PC power supply for other purposes, too.

15 years, 8 months

infocom on other systems

by dgriffi＠cs.csubak.edu

Yesterday I unearthed some unopened Infocom games which will go on Ebay tomorrow afternoon. What caught my eye was a blurb indicating that games were available for the DECmate, DEC Rainbow, HP 150 and 110, and TI Professional. I'm especially interested in the DECmate version. Does anyone know anything more about these obscure ports of Infocom games? -- 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?

15 years, 8 months

Paper tapes+rubber bands+30 yrs = mess

by james＠jdfogg.com

> I have a large collection of paper tapes that came with a > vintage Altair 680b and Teletype model 33 that I > inherited. I've restored the machines and have started > looking at the tapes. Unfortunately, I have discovered > that the rubber bands that were used to keep the tapes > rolled up have all dissolved into a yucky gooey mess that > is in most cases, stuck to the tapes. I don't have experience with paper tape. From the description it sounds like the oils dissolved the rubber by acting as a solvent to the natural oils in rubber. If this is the case, you could try something that can act as a solvent to the oils, such as acetone. You'll have to test against a sample tape, and don't assume that the acetone or other solvent wont remain in the tape and cause damage in the future. You should try to find a way to copy new paper tapes or transfer the data to some other medium. How much data is in the exposed tape that was damaged? Don't they have leaders with no data on them? Did the damage extend into the layers beneath the surface? I'm assuming that the tapes were rolled up and only the first few inches were damaged.

15 years, 8 months

Super Serial Card...

by geneb＠deltasoft.com

I'm in need of a working, complete, Super Serial Card for an Apple IIe that I recently got. If you've got one that you'd like to part with, please contact me off list. I'm also looking for the dip switch settings and 10 pin header pinout for an Epic Technology "2400 Classic II" modem card. It appears to be an internal Smartmodem clone glued to a SSC clone, but I need docs on it.:) Thanks All! g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind.

15 years, 8 months

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test-drb September 2008