test-drb September 2002

test-drb@ccmp.vtda.org

217 participants
408 discussions

by healyzh＠aracnet.com

Yesterday I ran across someone that has a fairly large supply of Tek Oscilliscopes available with all the pluggins (I believe they're the 7704A model). They were well cleaned prior to storage and they've been kept in a very clean environment. He said prior to storing them they all worked, but prior to selling any he'd want to recheck them. I gather he wants a fair price (it sounded reasonable to me), and would be willing to ship (for an additional cost). If anyone is interested, let me know and I'll put you in contact with him. Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh(a)aracnet.com (primary) | OpenVMS Enthusiast | | | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

22 years, 2 months

Leor Zolman's BDS C Now Public Domain

by r_beaudry＠hotmail.com

Don't know how many of you are on comp.os.cpm, but in case you missed it, Leor Zolman has decided to release the full retail package of BDS C, including *ALL* source code (compiler as well!) to the Public Domain. http://www.bdsoft.com/resources.html#bdsc Check it out! Rich B. _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

22 years, 2 months

Altair-what do I do first

by kapteynr＠cboe.com

Good move -- don't plug it in yet. The biggest danger is that the electrolytic capacitors have depolarized. In that case, they could heat up and explode when you turn it it on. Search Google for "reforming electrolytic capacitors" and you get a lot of links. In any case, detach everything from the power supply and check it out first. Unfortunately, Altairs have no connectors for this, so you will have to desolder the wires. Some suggest powering it up slowly on a variable transformer, but I have not tried that. After checking out the power supply voltages, unplug all of the cards and power up the front panel only. Then do the same for the CPU, etc. -----Original Message----- From: cctalk-admin(a)classiccmp.org [mailto:cctalk-admin@classiccmp.org]On Behalf Of Ron Hudson Sent: Tuesday, September 24, 2002 8:51 AM To: Classic Computers Subject: Altair-what do I do first I have just been offered an altair computer, it's been sitting in the back of a garage, unused for some time. I don't want to just plug it in and power it up right away do I ? Inspect -- what am I looking for? Clean -- best method? It is described as "not having switches or blinking lights", having floppy disks, having been used for somthing to do with ham radio. This is in advance of actually getting the computer,

22 years, 2 months

Altair-what do I do first

by bshannon＠tiac.net

Thanks for catching my typo Joe. The MTBF (mean time between failures) is greatly REDUCED by unsoldering chips, often very dramatically so. Ever notice the soldering specifications for TTL devices, like 300 degrees C for not more than 10 seconds? This limitation is given for the parts to meet their rated MTBF, not because 300 degrees C for 11 seconds will destroy the parts right away. Resolder the parts, and you may be throwing away well over half their service life. Clearly not a professional way to restore a machine. For some repairs, we have no other option, but melting solder is a last resort. Joe wrote: >At 10:38 PM 9/28/02 -0400, you wrote: > > >>If you think this does the least dammage, your grossly in error. As a >>test engineer, I can direct you to any number >>of volumes that will show you the dramatic increase in MTBF >> > > I think you mean dramatic DECREASE in MTBF. But I doubt many people on this list even truely understand what MTBF is. I worked in reliablility, logisitics and maintainablity so I'm prpobably one of the few that would catch this. > > Joe > > > > > > for > >>resoldered parts. This is known, for-sure dammage, not some risk of >>dammage from a theoretical regulator failure. >> >>Care to defend this position? >> >> >> >> >> >> >> >> >> > > >

22 years, 2 months

OT: URL for the list's Tesla fans

by lgwalker＠mts.net

http://www.edm.net/~jwilliams/tesla.html lgwalker(a)mts.net bigwalk_ca(a)yahoo.com

22 years, 2 months

PDP-11/93 Schematics

by jhfinepw4z＠compsys.to

A friend of mine has an 11/93 that hangs about every third time the power is cycled. Can anyone help with a set of schematics? Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.

22 years, 2 months

Free 8" floppy drives, near Washington DC

by dwightk.elvey＠amd.com

>From: classiccmp(a)trailing-edge.com > >Same conditions as the DEC stuff: You pick up only. > >A bunch of Shugart 8" floppy drives, electrically identical to SA801's >but the aluminum castings are slightly wider than a real SA801. (Maybe >these are SA901's? I don't know.) > >E-mail me at "shoppa(a)trailing-edge.com" if interested. > >Tim. > Hi I think that all of the 900 series used 44 pin edge connectors instead of 50 pin. At least the SA925 uses the 44 pin connector. I have at least one of the larger SA800's and it just has a different dash number as I recall ( I used its control board and spindle shaft on another drive that fit the box I had ). Dwight

22 years, 2 months

Anybody want a TI Linear and Interface Circuits Data Book?

by rigdonj＠cfl.rr.com

First Edition, 1973, semi hard cover. Original owner's name on the outside top of the pages, slight crease in front cover. Paper sticker on front cover. Otherwise in VG conditon. I have two of them and don't need them both. Your's for the price of shipping. Joe

22 years, 2 months

Altair-what do I do first

by Robert_Feldman＠jdedwards.com

Yes, a great way to remove any socketed chips that are stuck (or soldered-in ones for that matter!) <GD&R> -----Original Message----- From: Bob Shannon [mailto:bshannon@tiac.net] Sent: Saturday, September 28, 2002 9:50 PM To: cctalk(a)classiccmp.org Subject: Re: Altair-what do I do first <snip> Using a crowbar is an excellent suggestion really, if your super-concerned about rare chips, <snip>

22 years, 2 months

Seen this?

by Lee.Davison＠merlincommunications.com

There's at least an Apple ][ in that lot. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2057798506&ssPageName=ADM E:B:SS:US:1 6 hours to go. Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

22 years, 2 months

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test-drb September 2002