- vcf-midatlantic - lists.vcfed.org

OT: Testing new ip for my mail server
by Ben Greenfield 05 Aug '16

05 Aug '16

Hey All, Ignore this I’m just testing my mail configuration after switching ips for my mail server. Thanks, Ben

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Retr0brite chemistry (was: Re: apple // monitor)
by Herb Johnson 02 Aug '16

02 Aug '16

The Reddit article was very informative. Thanks for posting the link. The Reddit article discusses conjugation of carbon double-bonds and how that affects light absorption (color). I found a useful discussion of that at: https://people.chem.umass.edu/samal/269/color.pdf A Brief Discussion on Color. Herb -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net

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Seymour Papert
by Evan Koblentz 01 Aug '16

01 Aug '16

Another great mind is gone. http://news.mit.edu/2016/seymour-papert-pioneer-of-constructionist-learning… Notice the picture showing Lego on his desk! He invented Logo so it's probably the same kit currently on my desk that we'll show at Maker Faire in October.

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apple // monitor
by Evan Koblentz 31 Jul '16

31 Jul '16

Can anyone spare a proper Apple monitor? This 13" TV with my //e Platinum just isn't cutting it. Everything is blurry no matter what I adjust in its settings.

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C= stuff for good home in Harrisonburg Va 22802
by Evan Koblentz 30 Jul '16

30 Jul '16

Faye Morris in Harrisonburg Va 22802 (femorris8356(a)gmail.com) has some C64 stuff for a good home. Reply to her directly.

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OT: Mitnick on phishing attacks
by Evan Koblentz 30 Jul '16

30 Jul '16

Here's the story I wrote today. http://www.techrepublic.com/article/kevin-mitnick-user-training-could-have-…

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Speaking of the next workshop (Aug 20 & 21)
by Jeffrey Brace 29 Jul '16

29 Jul '16

Just reminding everyone that the next workshop is scheduled for Aug 20 & 21. So who's interested in going? And what will you work on? -- Jeff Brace - ark72axow(a)gmail.com

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OT: Anyone have an old laserdisc player?
by Jason Perkins 29 Jul '16

29 Jul '16

I've got some late 70s / early 80s General Motors laserdiscs that I want to capture, but my 90s Sony player won't read them. I'd like to try the discs in a 70s player to see if there's any hope of getting them to play, but don't want to drop $$$ on a player when I'll only use it 4 or 5 times. Does anyone on this list have a working player from 1984 or older with a gas tube laser? The GM dealers had Pioneer PR-7820's, I'd think that has the best chance of reading the discs. Thanks, -- Jason Perkins 313 355 0085

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TRS-80 PC-1 & Printer
by Herb Johnson 29 Jul '16

29 Jul '16

David Gesswein posted: > I would always recommend opening up and checking anything you know has a > battery in it. They frequently leak which will damage whatever is nearby. > Nicads leakage seems to be less volume than some other types. > > Powering it up with the leakage would likely make things worse. There's many kinds of batteries inside vintage electronics; it's useful in my opinion to identify what you have. Generally you should not replace one kind with another kind. I'll walk through reasons - do your homework before serious work. I won't discuss lead cells or gel-cells. NI-cd's or Nicads work at different voltages than Nickel-hydride which is the more recent alternative. Lithium cells are usually very small batteries. Leakage is a problem, among other problems. Nicads have a longer shelf life, can be completely discharged but still are rechargable - good for those solar yard-lights. They usually don't leak, but do corrode and produce a flaky material. You can still obtain NiCd batteries, for equipment which may sit for months and then be put back to service. Also: when you want the same voltage from the same number of battery cells (say a NICd 12V pack). Nickel-metal-hydride or NiMH don't like to be completely discharged. They are more common these days of course, and have more power in a smaller package. Lithium batteries were used for years in vintage computers, as clock and data backup power in tiny cells (Apple Macintosh computers). I believe many of the coin-cells are lithium. They are not rechargable, they have a VERY long shelf life. But the cylindrical-type (look like fractional AAA or AA batteries) sometimes leak, and when they do it's a gooey awful mess. The 1990 lithium removable cells, seem to leak more than the 1980's wired-in lithium cells. They have specific voltages per cell and package, so pay attention to both when replacing. A side issue: the constant voltage from these batteries, produces copper corrosion - that green powder stuff - on circuits. I see chips and PC boards with green on them. Not good, and scrubbing off the copper oxide just reveals bare copper which will corrode unless coated with something. Frankly- I advice removing these batteries from any computer, when you can operate it without one. Install it when using, if you insist on the correct date or have BIOS settings, etc. All part of the fun of vintage computer repair. I enjoy the challenges and finding problems and fixes and work-arounds. That calls for understanding the fundamentals. That's how I work.... Herb Johnson -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net

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Re: [vcf-midatlantic] OT: Anyone have an old laserdisc player?
by Matt Patoray 29 Jul '16

29 Jul '16

On Fri, Jul 29, 2016 at 10:25 AM, Ben Greenfield via vcf-midatlantic < vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > ---------- Forwarded message ---------- > From: Ben Greenfield <ben(a)cogs.com> > To: vcf-midatlantic <vcf-midatlantic(a)lists.vintagecomputerfederation.org> > Cc: > Date: Fri, 29 Jul 2016 10:25:40 -0400 > Subject: Re: [vcf-midatlantic] OT: Anyone have an old laserdisc player? > My players my be too new. > > One is an LD-4000 and the other is a LD-4400 > > Let me know if those would work. > > Ben > Ben, Those players are both Laser Diode based, being industrial they may play the discs a bit better then a consumer deck from that time but not much better. I have one of these, but it is in Ohio, it plays GM and DiscoVidion Discs very well. http://www.blamld.com/DiscoVision/LD-660.htm This is also a great player for them. http://www.blamld.com/DiscoVision/VP-7200.htm -- Matt Patoray Owner, MSP Productions KD8AMG

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