test-drb March 2000

test-drb@ccmp.vtda.org

150 participants
515 discussions

by edick＠idcomm.com

Please see embedded comments below. Dick -----Original Message----- From: allisonp(a)world.std.com <allisonp(a)world.std.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Monday, March 13, 2000 11:12 AM Subject: Re: Red Erasors >> PCB's were gold-plated. Since the eraser always left a clean gold plated >> edge connector, I quickly concluded it was dirt and not corrosion that was >> accumulating at the interface between PCB and backplane. I found much less >> of this occurring in clean environments where dust didn't accumulate in the > >Actually it can be corrosion. Good gold plated fingers are gold over >nickel over copper and have excellent resistance to wear, corrosion and >metal migration. Many however cheap out and do gold over copper, very >bad. This gold over copper tends to have problems with the copper ions >migrating to the gold surface and turning a bluish-green. Being "chromatically challenged" (can't tell either blue or green from grey or pink) to such extent that the corrosion or dirt was just a dark smudge, I never considered that it might result form low quality boards. Thanks for explaining this. >Attacking that >with abrasives or solvents are temprorary solutions at best ans the >copper ions will continue to migrate. This is why the layer of nickel is >needed to keep the gold clean. This also depends on the connector being >gold/nickle/copper as well or the metal migration happens from the >otherside (connector). Adding to that boards with tin(solder) plated >connectors and you can effectively posion the connector system. My altair >and later replacement WAMCO backplanes suffered this fate from the mixed >plated connectors and boards. It showed up after about two years in the >slightly salty humid LongIsland air, symptoms were boards must be pulled >and plugged back in before the system would run if powered off for more >than a few days. I would have to use goldwipes and M50 solvent every >few weeks to make it only somewhat stable. Even a film of silicone oil >only helped somewhat. > >Oh, add oil vapor (machine shops), tobacco smoke or other pollutants and >the reliability and surface accumulations can be far worse. > > >Allison > >

25 years

Red Erasors

by edick＠idcomm.com

Well, leave it to Tony to suggest a practical way to handle an awkward job . . . This one's GOT to work! Dick -----Original Message----- From: Aaron Christopher Finney <af-list(a)wfi-inc.com> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Monday, March 13, 2000 11:32 AM Subject: Re: Red Erasors > > >On Mon, 13 Mar 2000, Richard Erlacher wrote: > >> My question would have to be, "How do you clean the backplane connectors? > >I think it was Tony who brought up a punch card soaked in alcohol to >clean the backplane connectors. Mildly abrasive, doesn't leave anything >behind. >

25 years

The C programming language

by Glenatacme＠aol.com

In a message dated 03/09/2000 3:19:11 PM Eastern Standard Time, Hans.Franke(a)mch20.sbs.de writes: > I wouldn't consider C as anything 'grown'. maybe evolved in the > sense of degeneration. Hey, Hans, I don't get this. C is the most versatile, flexible, and portable language ever devised. It permits complete control of hardware while at the same time allowing elegance in program design and structure. Can ADA match that? Glen Goodwin 0/0

25 years

Dayton Computerfest finds

by ethan_dicks＠yahoo.com

--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > For a Mac-to-Newton cable, the interconnections are: > > Ground (4) -> Ground (4) (also connect to connectors' shrouds) > Transmit+ (6) -> Receive+ (8) > Transmit- (3) -> Receive- (5) > Receive+ (8) -> Transmit+ (6) > Receive- (5) -> Transmit- (3) > Data Term Ready (1) -> Clear To Send (2) > Clear To Send (2) -> Data Term Ready (1) Bingo! Thanks. -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

25 years

Why etc.

by allisonp＠world.std.com

<> 5) Red pencil erasors are excellent for cleaning card edge connectors. < <I was told that red pencil erasers should never be used as they sulfur <compounds, and to use instead a natural gum rubber or white plastic <eraser. None should be used unless extreme measures are required. The gold plating is only 100u and can be rubbed right off. If you wear through the connector gold life will be painful as the connector is now susceptable to green corrosion (copper) and that will be a mess to prevent. Allison

25 years

Dayton Computerfest finds

by pete＠dunnington.u-net.com

On Mar 12, 19:09, Aaron Christopher Finney wrote: > No extra cable...but I do have the RS422 standard pinout handy, this is > the one I used to make my null-modem cable: > > Pin Function > ------------------ > 1 handshake out (DTR?) > 2 handshake in (RTS?) > 3 TD- > 4 GND > 5 RD- > 6 TD+ > 7 GPinput (carrier detect) > 8 RD+ Almost right -- pin 2 is CTS not RTS: Pin Function ------------------ 1 HSKo (DTR) 2 HSKi (CTS) 3 TxD- 4 GND 5 RxD- 6 TxD+ 7 GPi (DCD) 8 RxD+ For a Mac-to-Newton cable, the interconnections are: Ground (4) -> Ground (4) (also connect to connectors' shrouds) Transmit+ (6) -> Receive+ (8) Transmit- (3) -> Receive- (5) Receive+ (8) -> Transmit+ (6) Receive- (5) -> Transmit- (3) Data Term Ready (1) -> Clear To Send (2) Clear To Send (2) -> Data Term Ready (1) -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years

More stuff for the cost of shipping

by vcf＠siconic.com

More stuff from this guy is available. Please reply directly to the sender. Reply-to: 3web(a)netscape.net ---------- Forwarded message ---------- Date: 12 Mar 00 19:57:28 MST From: Walter Brown <3web(a)netscape.net> Subject: Re: [Re: C-64] Hi, Sellam, Thanks, loads. I have received 4 replies and can probably find a home for my c-64 stuff. I also have a Radio Shack 286 (Tandy 1000 TL/3) with internal hard drive, 3-1/4 and 5-1/2 floppy drives, monitor, Deskmate O/S with disks, DOS disks, manuals, magazines (many issues of DOS Resource Guide) and (I thought) a printer, altho I don't see the printer at this moment. Will donate to anyone paying the postage. If you wouldn't mind posting this also, I would appreciate it very much. Is there anything I can do for you? I am located in Denver, Co. Thanks again for your help. Walt Sellam International Man of Intrigue and Danger ------------------------------------------------------------------------------- Looking for a six in a pile of nines... VCF Europe: April 29th & 30th, Munich, Germany VCF Los Angeles: Summer 2000 (*TENTATIVE*) VCF East: Planning in Progress See http://www.vintage.org for details!

25 years

Icom Attache: What is it?

by netsurfer_x1＠hotmail.com

I was doing a little snooping a while back & I came across a computer called the Icom Attache. It sounded like an intresting computer, unfortunately, I can't find anything about it! What is it? Is it an OEM-ed Otrona Attache, a regular PC-Compatible laptop, or is it something completely different? ____________________________________________________________ David Vohs, Digital Archaeologist & Computer Historian. Computer Collection: "Triumph": Commodore 64C, 1802, 1541, FSD-1, GeoRAM 512, Okimate 20. "Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II. "Delorean": TI-99/4A. "Monolith": Apple Macintosh Portable. "Spectrum": Tandy Color Computer 3. ____________________________________________________________ ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

25 years

Compact QBus Systems (Was re: Los Angeles: Commodore PET 8032's...)

by allisonp＠world.std.com

<The H780 supply is about 3 inches wide IIRC and mounts beside the card cage <That would make it a couple inches wider than the TU58EX. <Dan More like 5" when you add casing. I have a 780+backplane. The Rackmount BA11-M is 3.5h x 19w x 18.5d (the depth is possibly inaccurate) The destop version is a little larger for prettyness. The BA11-VA 3.5h x 13w x 13.5d the H780 ps alone 5.5"W3.3hx14.625L The BA11M however will take a lot more cards though but is very noisy. Allison

25 years

The C programming language

by Glenatacme＠aol.com

Megan wrote: > Unfortunately, it appears that those who advocate and write in C > and other such structured languages appear to have lost the ability > to comment their code (at least it seems that way from all the code > I look at at work -- I would say a mere 5% is really commented). > > They appear to assume that C code is itself sufficient commenting... > > It doesn't work. This may well be true, but C programmers are not the only offenders. The worst period of my career was converting COBOL gorilla-code to C. The unstructured, uncommented COBOL code was in some cases so indecipherable that I simply dug out the original spec and threw the COBOL away. Unfortunately, this wasn't always possible . . . I myself heavily comment my C code, since I have to maintain it and can't always rely on my failing memory ;>) Glen Goodwin 0/0

25 years

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test-drb March 2000