test-drb May 2004

test-drb@ccmp.vtda.org

244 participants
500 discussions

VT100 ROM 2 wanted [Was: Wanted: M9312 ROMs]

by pete＠dunnington.u-net.com

On May 27, 20:50, Antonio Carlini wrote: > Whoever ends up hosting the archive may want to > consider storing the files by part number name > (e.g. 23-032E-00 for the DEC ROM above, > although I suspect there's a digit missing out > of the middle of that 2-5-2 part number!). Forgot to mention -- mostly I keep my images as binary files, to save space. There are two consequences of this: If you use a broken version of Wndows Netscape to download them, it may insert spurious junk, and You might want to convet them to S-record or Intel HEX. There's the source to a small program to do the latter in http://www.dunnington.u-net.com/public/IntelHEX/ -- Pete Peter Turnbull Network Manager University of York

22 years

VT52 restoration progress

by wacarder＠usit.net

Thanks to the list members who gave me advice on discharging the CRT on the VT52. I have made progress on getting one functional terminal out of two dead ones. By using the VT52 Maintenance manual, I have done some troubleshooting and have one terminal displaying the flashing cursor by doing some board swapping. Now I have to get it to display characters as they are typed on the keyboard. Ashley

22 years

VT100 ROM 2 wanted [Was: Wanted: M9312 ROMs]

by pete＠dunnington.u-net.com

On May 27, 20:50, Antonio Carlini wrote: > Whoever ends up hosting the archive may want to > consider storing the files by part number name > (e.g. 23-032E-00 for the DEC ROM above, > although I suspect there's a digit missing out > of the middle of that 2-5-2 part number!). That's exactly how I store them :-) > An accompanying index file could spell out > exactly what is what (including version > numbers, where appropriate). > > (Must remember to go off and dig up the few > I have somewhere and contribute them). Yes please :-) -- Pete Peter Turnbull Network Manager University of York

22 years

3.5 inch DSDD diskettes have landed

by acme＠ao.net

Greetings -- The diskettes are here, so here are the details: Certron brand, retail packaged. 10 diskettes per box, with inner plactic sleeve and labels. Still shrink-wrapped. I opened two boxes and formatted 6 randomly-selected diskettes without incident. They look and act brand new. They are packed in two different size cartons: 10-box and 42-box. Weight on the 10-box cartons is 4 pounds, and the 42-boxers are 22 pounds. I'm in Orlando FL, zip code 32810. Price per box is $1, minimum 10-box shipment, plus shipping. I'd prefer to ship UPS but will ship USPS media mail upon request. I can accept VISA, MasterCard, American Express and Discover, but we're flexible here so if you have another preferred method of payment let me know. I *think* I have replied to everyone who said they wanted in on this deal, but if I skipped you, send me an email, either here or at glenatacme(a)aol.com. I'll get back to you privately with our toll-free 800 number so you can call and arrange shipping and payment. Any other questions, let me know. Later -- Glen Goodwin 0/0

22 years

Paging Mike Stein in Toronto

by dave04a＠dunfield.com

Trying to reach Mike Stein in Toronto, who is also a collector of vintage computing equipment. Please drop me a line at the address in my sig. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

22 years

What's the weirdest thing that you've ever found inside a computer?

by charlesmorris＠direcway.com

>> But I got to wondering what is the strangest thing that anyone has >> ever found inside a computer or similar piece of electronics gear. >Spiders and I saw a computer (well, a PeeCee) that was used by a mouse >or similar rodent as a toilet... Not so unusual, I guess, but I opened up my PDP-8/L and found a large mouse nest complete with mother and three jellybean-sized babies nursing. She ran away dragging them from her nipples. Just as well, I wouldn't have had the heart to kill them anyway. I also had a home-built S-100 system when I lived in an apartment. There were occasional roaches. One day I noticed a roach or two running into and out of the computer case. I lifted the lid and saw literally HUNDREDS of them, heading in every direction including up my arm. I retreated and returned with a large can of insecticide... there was an amazing amount of turds, too. Talk about debugging a computer :) -Charles

22 years

building an RS-485<->RS422 converter

by dwight.elvey＠amd.com

>From: "Bert Thomas" <bert(a)brothom.nl> > >Ethan, > >Ethan Dicks wrote: >> >> It is a point-to-point RS-485 link, in this particular installation, not >> multi-drop, fortunately. >> >> I presume I would just tie the enable pins to "true" >> >> The RS-485 device in question is a simple 4-wire transmit/receive pair. >> > >I don't understand why you need a converter anyway. RS422 and RS485 use >the same voltage levels AFAIK. RS422 uses two pairs of wires: one for >sending and one for receiving. Devices are daisy-chained. RS485 uses one >pair of wires, for both sending and receiving. Some RS485 devices have >seperate terminals for the sending and receiving wires, so they are in >fact RS422 devices. Normally those wires are connected in parallel, so >that the devices also receives what it sends. > >There is basically one situation that has to be avoided and that is two >transmitters connected at the same time. If you say that you RS485 >device has 4 wires, I'd guess it has 2 for sending and 2 for receiving, >so it would simply connect easy to the RS422 device. > >BTW, a common mistake is that people think that since RS422/RS485 are >differential busses, the ground does not have to be connected. I once >red a very good article on this topic that explains that the grounds of >all devices should _always_ be connected. > >Correct me if I'm wrong. Hi Yes, the ground/commons do need to be connected. The receivers only have so much common range that they work over. These are more tolerant of ground noise but they have limits just as well as any solid state device does. You absolutely need to have a reasonably good common ground. As I recall, they are spec'ed as about 7 volts common noise and have a maximum of around 15 volts common voltage. With high power devices or circuits that do are not connected to a common ground, these levels can be easily exceeded. It is best to have a star type ground system to avoid ground loops. If you need true isolation, one should use optical isolators or transformers. Dwight > >-- >One thing I just wondered: in what time zone do you people at the >southpole live? > >Bert >

22 years

Transputer Education Kits

by RMeenaks＠OLF.COM

Just been posted on ebay... http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=162&item=4134317003&r d=1&ssPageName=WDVW Cheers, Ram (c) 2004 OpenLink Financial Copyright in this message and any attachments remains with us. It is confidential and may be legally privileged. If this message is not intended for you it must not be read, copied or used by you or disclosed to anyone else. Please advise the sender immediately if you have received this message in error. Although this message and any attachments are believed to be free of any virus or other defect that might affect any computer system into which it is received and opened, it is the responsibility of the recipient to ensure that it is virus free and no responsibility is accepted by Open Link Financial, Inc. for any loss or damage in any way arising from its use.

22 years

Anybody going to VCF east from the Washington DC area?

by wh.sudbrink＠verizon.net

I haven't decided for sure, but I'm thinking of going. If I do decide to go, I'd want to drive and I'd rather not drive the whole way myself. Actually, arranging a car (or van) pool would likely clinch my decision in favor of going. Available travel options will also (obviously) influence what I might bring to exhibit. I will not be available for an extended trip... itinerary would need to be something like: pack Wednesday night, travel up Thursday, attend, pack Saturday night, travel back Sunday. Based on my expirences driving to NYC, I assume the trip to Burlington would kill a day. Thanks, Bill Sudbrink

22 years

OLD RSTS manuals found

by wacarder＠usit.net

I was going through some boxes of old stuff from my college days and I found the following manuals: * RSTS-11 System Managers Guide, DEC-11-ORSMA-B-D for use with V004A, Jan 1973 * RSTS/E System Generation Manual, Update#1, DEC-11-ORGNA-A-D (for V06A-02), July 1975, Dec 1975 * RSTS/E System Reliability Test, DEC-11-ORSRB-A-D (for V05B-24), October 1974 * RSTS/E System Manager's Guide, DEC-11-ORSMC-A-D (for V05C-01), October 1974 * RSTS/E Documentation Directory, DEC-11-ORDAA-A-D (for V6), July 1975 * RSTS/E System Manager's Guide, DEC-11-ORSMB-A-D, (for V05A), First Printing, May 1973 (V4?) Does anyone know if these exist in PDF form yet? I have not looked over all the contents of Al's Bitsavers yet, but I thought I'd go ahead and make a list of what I have here. If these aren't in PDF form somewhere already, I'll try to scan them some time over the summer. I need to get a scanner with a sheet feeder! Ashley

22 years

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test-drb May 2004