test-drb July 2016

test-drb@ccmp.vtda.org

190 participants
243 discussions

by COURYHOUSE＠aol.com

I just resubmit each time and check the archive in case I missed something. works ok this way. never missed anything life changing. Ed# In a message dated 7/10/2016 12:42:20 P.M. US Mountain Standard Time, robert.jarratt at ntlworld.com writes: > -----Original Message----- > From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Brad H > Sent: 10 July 2016 19:34 > To: 'General Discussion: On-Topic and Off-Topic Posts' > <cctalk at classiccmp.org> > Subject: 'Bounces' > > Just re-subscribed to cc-talk. I'm wondering if anyone has an answer on this - > every now and again I get these warning emails about 'excessive bounces'. I > have to click a link and then they go away for a while. But sometimes I get > busy and forget.. and then the list unsubscribes me. No idea what 'excessive > bounces' means or what I can do to prevent it from unsubscribing. Any > thoughts? > > This has affected me recently, and another friend of mine also dropped off the list for the same reason. Regards Rob

8 years, 1 month

Lunar Module Code Walk Through

by dave.g4ugm＠gmail.com

I guess this is on-topic. http://hackaday.com/2016/07/05/don-eyles-walks-us-through-the-lunar-module-s ource-code/

8 years, 1 month

'Bounces'

by COURYHOUSE＠aol.com

yes it had just tossed my email address too so I re subed maybe it does the dump all at once of us dumpees? Ed# In a message dated 7/10/2016 11:34:25 A.M. US Mountain Standard Time, vintagecomputer at bettercomputing.net writes: Just re-subscribed to cc-talk. I'm wondering if anyone has an answer on this - every now and again I get these warning emails about 'excessive bounces'. I have to click a link and then they go away for a while. But sometimes I get busy and forget.. and then the list unsubscribes me. No idea what 'excessive bounces' means or what I can do to prevent it from unsubscribing. Any thoughts? Brad

8 years, 1 month

Connectors: Both contact surfaces must also be the same material?

by COURYHOUSE＠aol.com

actually some DEC backplane had gold dos inside on finders of backplane and in one instance we had a 8i that has all gold plated everything on the backplance and heavy gold too. back in the days - - Ed Sharpe retired CEO Computer Exchange Inc Phx In a message dated 7/10/2016 12:30:30 P.M. US Mountain Standard Time, tothwolf at concentric.net writes: On Sun, 10 Jul 2016, Jon Elson wrote: > On 07/10/2016 12:07 PM, Paul Koning wrote: >> On Jul 10, 2016, at 9:07 AM, Tothwolf <tothwolf at concentric.net> wrote: >>> On Sun, 10 Jul 2016, Paul Birkel wrote: >>>> Stated Tothwolf tothwolf at concentric.net: >>>> >>>>> "Both contact surfaces must also be the same material or tin oxide >>>>> will form on the surface of the gold plating and cause a major >>>>> headache. This was a serious problem with 486 and earlier Pentium >>>>> PCs with 30 and 72 pin SIMMs and it led to a number of lawsuits." >>>> Almost every DEC System Unit ("backplane") that I've ever seen uses >>>> tinned-contacts, yet the Modules all use gold-plated fingers. >>> I'm not familiar with them used in DEC systems in that way, but the >>> problems with mixing tin and gold plated connectors is well >>> documented. Even the connector manufacturers warn against mixing >>> different platings. >> While "don't mix contact surfaces" is sufficient, it isn't necessary. >> What matters is the "anodic index" of the metal, or rather, the >> difference between those two values for the two metals in contact. If >> that difference is large, you have a problem; if it's small enough, you >> do not. "Small enough" depends on the environment; aboard an >> oceangoing ship the number has to be smaller than in an office setting. >> I remember looking into this topic for an investigation of what types >> of contact platings are acceptable for lithium coin cell battery >> holders in IT equipment. > > This applies to bolted contact for structural things. Gold connectors > usually have light contact pressure to preserve the soft gold plating. > Tin contacts usually have higher contact force to scrape the oxide off > the tin surface. When they are mixed, the tin can wipe onto the gold > and then allow oxides to form due to the lower contact force. Tin > contacts are supposed to provide enough pressure to form gas-tight > contact areas. Another thing to keep in mind here is that electrical current is being passed through the junction. Mixed metals greatly increases the potential for electromigration. > And, of course, when exposed to salty air, then everything goes downhill > REAL fast, corrosion galore. In a salt environment, I'd use > semi-hermetically sealed connectors, and still expect lots of problems. > The Navy probably knows a LOT about these things. Even in a reasonably good atmospheric environment weird issues can crop up. I once evaluated an air handler controller which had worked perfectly in product testing, but once field deployed, had a very high failure rate. It was made up of two pc boards with a pair of .100" pin and socket board to board interconnects. The two boards were physically held together with 4 nylon snap-in standoffs. The lower board contained terminal blocks, modular connectors, and the power supply circuitry and the upper board contained the microcontroller, network circuitry, etc. The cause of the failures turned out to be fretting corrosion of the board to board connectors caused by vibration. Another contributing factor was that many installers were not installing all 4 mounting screws when mounting the controller inside the unit (these were field retrofitted controllers) but were instead only installing 2 screws in opposite corners. The fix was to replace all of the existing board to board interconnects, both the header and socket with parts that had 30 microinches of hard gold over nickel (the original parts had 15 microinches of gold) and to use a contact lubricant during assembly. Repaired boards were also to be installed using all 4 mounting screws. The vendor later redesigned the controller so it was all on a single board (while still admitting no fault, of course).

8 years, 1 month

Looking for old connectors

by lehmann＠ans-netz.de

Hi, for rebuilding a circuit, I'm in need of 3 old connectors used on the original board. ###################### One is easy - J3 is a 2x10 pin 2.54mm connector which is still common today. But it is higher than the usual connectors. It has a hight of 1.5cm. If you search for the printed A-MP number (1-87456-6), you'll find the housing, but not the soldered clips used inside this housing.... http://pics.pofo.de/gallery3/index.php/S8000/S8000_boards/FINCH-Adapter-Boa… ###################### The next one is a power plug used on a CDC FINCH harddisk. The manual states, that the Connectors AMP 1-87270-1 or 3-87025-3 can be used. I guess this where connectors used with cables - but I need a connector which can be placed on a circuit board like this one: http://pics.pofo.de/gallery3/index.php/S8000/S8000_boards/FINCH-Adapter-Boa… ###################### The next one is also a power plug - but I have no idea about its AMP number or something: http://pics.pofo.de/gallery3/index.php/S8000/S8000_boards/FINCH-Adapter-Boa… http://pics.pofo.de/gallery3/index.php/S8000/S8000_boards/FINCH-Adapter-Boa… http://pics.pofo.de/gallery3/index.php/S8000/S8000_boards/FINCH-Adapter-Boa… Its counterpart is shown here and labled with AMP, but no number: http://pics.pofo.de/gallery3/index.php/S8000/S8000_case/Disk-Tape-Component… Any info on any of this connectors would be great... Regards, Oliver

8 years, 1 month

server maintenance

by jwest＠classiccmp.org

The classiccmp VM will go down tonight around 10pm-ish CST. There is nothing wrong with the VM, but the NAS it's disks are on is having some issues. We've live-migrated all VDI's off that NAS except classiccmp's. Due to the size of those drives, they will migrate a lot faster if that VM is shut down so that's the route we're taking. I would expect it to be back up in the wee hours of the morning - at least that's what the guy doing the work tells me. Just fyi.. J

8 years, 1 month

VCF West has 30 exhibits

by COURYHOUSE＠aol.com

what kind of wooden modem? In a message dated 7/9/2016 9:04:37 P.M. US Mountain Standard Time, cisin at xenosoft.com writes: >> So, I guess that I can bring a few items for the consignment sales, >> (which is also "information coming soon"), but NOT a station wagon full >> of boxes of books, classic vintage computers (QX10, SMC70, early 5150, >> 8201a, etc.), hundreds of hard-sector diskettes, 3", 3.25" disks and >> alignment disks, another wooden modem, ARC serial analyzer, etc. >> (priced to meet expenses and lunch both days) >> Oh well. I would have needed to get help packing the car, etc. anyway. On Sat, 9 Jul 2016, Evan Koblentz wrote: > Sure you can bring a car full of stuff, as long as it's sold at consignment. > I do not know how much table space we will have for that. It is possible that > we'll ask you to bring in some at a time. At VCF6, I only brought a few things: http://www.vintage-computer.com/images/vcf6/vendor5.jpg but now I have more than ten times that, that needs to go or get DUMPSTERED. plus all that is left of http://www.xenosoft.com/FPUIB and at least 100 more boxes worth. But, my health is not good enough to even pack it all. My assistant at the last VCF died two years ago. I had been hoping to totally fill Prius station wagon, and sell enough first day to do an entire additional load the second day. But, I don't think that it is realiatic to imagine that I can manage to do that. Besides the need to channel it in small quantities through "consignment", I know that I can't manage even that level of physical exertion. So, I'll probably just fill a couple of boxes with IBM Technical References, Windows Resource kits, etc. and end up with most of the rest eventually going to paper recycling. (most of the FPUIB stuff has been in that list for 2 years, so there's obviously not a big pent-up demand) -- Grumpy Ol' Fred cisin at xenosoft.com

8 years, 1 month

offering part of uVax/VaxStation 3100

by jonelson126＠gmail.com

On 07/09/2016 09:28 PM, Jon Elson wrote: > I have the bottom part of a DV-31ETA-A-A01 VaxStation > 3100. It has the bottom of the case, the main CPU board > and the power supply. I think additional memory and the > graphics/SCSI adaptor were mezzanine boards, and are NOT > present in this. It was quite dirty when I found it, and > I have not tried to fire it up. Anybody have an interest > in this? > > Jon

8 years, 1 month

VCF West has 30 exhibits

by cctalk＠ibm51xx.net

Evan, I for one am very excited. I was wondering are there any vendors or consignment items at this time? Ali -------- Original message -------- From: Evan Koblentz <cctalk at snarc.net> Date: 7/9/2016 7:30 PM (GMT-08:00) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Subject: VCF West has 30 exhibits There are 30 exhibits for Vintage Computer Festival West XI next month: http://vcfed.org/wp/festivals/vintage-computer-festival-west-xi/vcf-west-ex… Exhibit registration is full. Contact me privately if you'd like to join the waiting list.

8 years, 1 month

word processor history -- interesting article (Evan Koblentz)

by c.murray.mccullough＠gmail.com

My first word processor was from Wang called ?Word Processor? and then IBM?s ?Displaywriter?. I tried ?Wordstar? originally called ?Wordmaster? but way too complicated. When desktop publishing came along WYSIWYG printing was made possible - the writer?s true handmaiden! In the microcomputer world, classic computing, it was ?Smartwriter? on the Coleco ADAM. Those were the days! Happy computing. Murray

8 years, 1 month

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test-drb July 2016