test-drb October 2003

test-drb@ccmp.vtda.org

252 participants
500 discussions

by JWDWRD＠aol.com

If you have any questions about the true story- I would be more than happy to help- after all- he was my father-and yes, I can prove it if necessary as so many people love to doubt that! Jennifer Barnhart-Woodward (for the record, he died June 8th 1983)

20 years, 7 months

Original IBM PC, Apple Macintosh cube, interest?

by cb＠mythtech.net

>Well, I had at least 4 people asking me individually what the Max >cubes go for these days. And I do not know the answer. If you are talking about the original Mac (the 128k Mac), then I believe they are pushing the $100 mark if they are complete with keyboard and mouse. Software, manuals, and guided tour audio tapes will push the price higher. I'm not a pricing expert, that just seems to be what I've seen them hover around on ebay and other trading lists. Of course, sometimes they go much lower... I picked on up not long ago for $25 shipped to me. I only bought it because it was offered on a list for a few months and no one wanted to buy it at all, and the owner was threatening to throw it out. -chris <http://www.mythtech.net>

20 years, 7 months

Original IBM PC, Apple Macintosh cube, interest?

by cb＠mythtech.net

>Hi, I keep seeing original IBM PCs and Apple Macintosh cubes and >although it's tempting to snatch one for myself this small stuff >isn't really my collector's specialty and I have not enogh room >anyway. But thought that may be some people here think it's >interesting enough to be saved. Since this stuff is shippable >and if there is real big interest I might go through the hassle >and pick such things up ship them. If you are talking about the G4 Cube, then I would want one if the price is right. Are you talking about those, or are you refering to the old classic Macs that have the built in 9 inch black and white screen? (the old Macs would be more the era of the IBM PC) -chris <http://www.mythtech.net>

20 years, 7 months

Original IBM PC, Apple Macintosh cube, interest?

by gunther＠aurora.regenstrief.org

Hi, I keep seeing original IBM PCs and Apple Macintosh cubes and although it's tempting to snatch one for myself this small stuff isn't really my collector's specialty and I have not enogh room anyway. But thought that may be some people here think it's interesting enough to be saved. Since this stuff is shippable and if there is real big interest I might go through the hassle and pick such things up ship them. regards, -Gunther

20 years, 7 months

ASR33 Teletype interfacing

by ian_primus＠yahoo.com

I have been attempting to get my ASR33 teletype connected to something and communicating, but so far I have not been successful. I have built the interface here : http://www.daedalus.co.nz/~don/computing/20mahack.html , but it didn't seem to work at all. I connected the teletype to a PC clone running Linux. I set the baud rate to 110 and tested it with a DEC VT100 set to 110 first, to make sure that the PC was communicating over the serial port properly. Then, I plugged in the teletype in place of the terminal with the little kludged adapter, crossed my fingers and turned to knob to the left. The teletype just rattled, not printing anything, and nothing from the keyboard printed either. Then, I turned the knob to the right. The teletype works fine, just as it had before. I can type on the paper, punch tape, etc. Before, when I was just testing the teletype without connecting it to anything, I got the exact same results - with the knob to the left, it just rattles, almost like "Break" is held down. When the knob is turned to the right, it works like a very heavy, loud, electric typewriter, and I can punch tape. On my teletype, the knob isn't labeled, but I am assuming that the knob must be Line/Off/Local. Does anyone have any ideas on how I can get this to talk to something? I don't know a lot about teletypes, but I downloaded the wiring diagrams from pdp8.net, and have been trying to figure it out. I think I am connecting it to the correct terminals on the barrier strip, based on what the wiring diagrams say, but then again, I might have something wrong. One problem is that I don't know what the Teletype is _supposed_ to do. I have never seen one operational, so I don't know if the constant rattleing if not connected is normal or not. There might be something wrong with it that I don't know, but chances are, it's just something I am doing wrong. I got suggestions to try using an old Apple Serial card, or an original IBM XT card to connect the teletype to, but I have neither. I have several Super Serial Card II's, as well as several early clone XT serial cards, but I don't think that they will work. At this point, I don't really care what I connect the teletype to, I would just like to get it to do something, and verify that it works. Eventually, I would like to build an RS232 adapter that would allow me to use the teletype on PC clone hardware, Pr1me hardware, whatever. I understand that the teletype uses a 20mA current loop, but I'm afraid that I don't really know anything about current loop technology. Anyone have some schematics for a true 20mA to RS232 adapter? Something tells me that this little kludge I found on the 'net probably isn't the best or most reliable way to do this. Any help would be greatly appreciated. Thanks! Ian Primus ian_primus(a)yahoo.com

20 years, 7 months

DEC DE450-CA Network cards

by r_a_feldman＠hotmail.com

I came across three DEC Etherworks Turbo PCI 10 Combo cards (DE450-CA) (vintage 1995, so not quite OT) with manuals and software. Free for postage (one or all) from Chicago. Reply to r_a_feldman(a)hotmail.com. _________________________________________________________________ Share your photos without swamping your Inbox. Get Hotmail Extra Storage today! http://join.msn.com/?PAGE=features/es

20 years, 7 months

Strange Qbus cards: Data Systems Design and Marconi

by waltje＠pdp11.nl

Hiyas, One of the results of today's 400mi drive is a box of Qbus cards that once were in custom PDP-11 based systems in use at various locations at Marconi. Most are the usual suspects found in such systems, but there's also a bunch of weird ones: - two Data Systems Design cards.. half-height, some RAM, some PROMs and a fair bit of logic. One 16Mhz xtal. One connector (28 pins or so) - a bunch of what look to be custom-made boards, with the Marconi label and typing. M-12 and such. Does anyone know more about these? Cheers, Fred -- Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist Visit the VAXlab Project at http://www.pdp11.nl/VAXlab/ Visit the Archives at http://www.pdp11.nl/ Email: waltje(a)pdp11.nl BUSSUM, THE NETHERLANDS / Sunnyvale, CA, USA

20 years, 7 months

Help? AMI S6800 computer/Flex

by rigdonj＠cfl.rr.com

Several weeks ago I picked up an early 6800 based computer that came from an original member of the Home Brew Computer Club. The computer is based on S6800 prototyping boards that were purchased as part of a group purchase through the HBCC. I just finished posting a webpage about the computer and what little I know about it along with pictures of chassis and all the cards. Please take a look and let me know if you can shed any light on the computer or it's history or the group purchase. BTW this computer ran Flex and I did get one disk with it containing Flex. <http://www.classiccmp.org/hp/ami/ami.htm> Joe

20 years, 7 months

27SF512-70

by Mehdi.Mir＠bakerhughes.com

I would like to know if you have any of these chips available. They are the direct flash replacement for the 27C512 that I'm looking for. Thanks Mehdi Mir

20 years, 7 months

29F512 flash memory

by Mehdi.Mir＠bakerhughes.com

I came across your website and read that you have 29F512 chips. Are these 28 pin DIP and will they replace the 27C512 eprom? Also if they are compatible are you able to sell me a few pieces. Thanks Mehdi Mir

20 years, 7 months

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test-drb October 2003