test-drb May 2011

test-drb@ccmp.vtda.org

162 participants
224 discussions

"Stan Veit's History of the Personal Computer" audiobook podcast

by david＠classiccomputing.com

"Stan Veit's History of the Personal Computer" audiobook podcast, chapter 4 http://bit.ly/izfPBD Loads a little slow - subscribe @ iTunes I would just like to bring this to everyone's attention. It is such a great book, and I have completed another chapter. I intend to start getting new chapters posted much sooner. Please also consider reading about Stan in the article I wrote last year, "Remembering Stan Veit" at http://classiccomputing.com/CC/Blog/Entries/2010/9/3_Stan_Veit.html Best, David Greelish, Computer Historian President, Historical Computer Society Classic Computing The Home of Computer History Nostalgia http://www.classiccomputing.com Retro Computing Roundtable podcast Stan Veit's History of the Personal Computer audiobook podcast Classic Computing Show video podcast Classic Computing Blog

13 years, 1 month

Oscilloscope Recommendation

by jonas＠otter.se

> > The guidance I have had is that for a PSU an analogue 'scope is fine. > For > logic then a logic analyser is what you need. Are you talking about > some > other category of hardware? > > Regards > > Rob > IMO, keep it simple for the moment. If you are not used to using a 'scope and you are only intending to repair your PSU at the moment, stay with an analogue dual-beam 'scope with a bandwidth of 20 MHz or so. There are excellent ones available cheap on eBay or other places. Philips, Gould, Hameg or Kenwood made decent 'scopes. It will also do fine for audio and even some video work, should the need arise. Learn to use that, then if you really think you need something better, replace it. Tektronix 465 is a lovely 'scope but IMO overkill for what you need at the moment. OTOH, if you anticipate getting deeper into repairing stuff, by all means get a Tex 465, 475. HP 180 'scopes are nice too. /Jonas

13 years, 1 month

Oscilloscope Recommendation

by technobug＠comcast.net

On 5/24/11 11:45 PM, Brent Hilpert wrote: >> Of course, just for vintage warm fuzzies, little can challenge an old >> Tektronix scope. I recently acquired a Tek 561A from a friend locally. >> Mmmm, vacuum tubes.... Turn on the scope, go get a beer while it warms >> up, measure and test with confidence. -- Ian > > Our radio museum here has several old 500-series tek scopes that I'd > love to refurbish and get working. There's a 4-channel plug-in in one of > them, too. Size, maintenance and fan noise might make them not-so-great > for regular use but it would be nice to be able to use them on occasion. > I loved the crispness of the trace and the blue tint of the phosphor in > the CRTs of that series. I wonder why Tek didn't continue using that > phosphor. The P11 phosphor was available on the 7000 series crates and the 400 series (455,465,475) portables as options. My 7844 has the pretty blue traces from the two-gun CRT as well as a 400 MHz backplane. I still make room and haul it out to make measurements requiring one of the off-the-wall plug-ins with which Tek populated that line of scopes. -> CRC

13 years, 1 month

How much do you like your PDP11?

by tiggerlasv＠aim.com

On Wednesday, May 25th, at 2:01 CDT, Eric Smith wrote: > Does it really surprise you that some people love old computers? It doesn't surprise me that he loves his PDP-11. . . after all, who wouldn't ? . . . but a Sony Vaio? That's just sick. Hehe. T

13 years, 1 month

Augat boards on eBay

by wmaddox＠pacbell.net

This fellow has multiple units of NOS Augat wire-wrap boards for $29.95 each. Seems like a good price given what the gold scrappers are paying these days, which is where they will likely end up if some vintage homebrew hobbyists don't snap them up... Item # 250823044454 http://cgi.ebay.com/Mupac-TLR8922-Proto-Board-Gold-Recovery-/250823044454?p… --Bill

13 years, 1 month

9-track Tapes gotta go

by mtapley＠swri.edu

All, I still have an office full of magnetic tapes that I need to get rid of. If you need some, let me know. I'll box and mail to you if you are willing to pay postage. I'll put the rest on eBay and/or VCM soon if I can't give them away here, and if that doesn't do it, I'll (sadly) trash them. The tapes are reel-to-reel, mostly 10" full-size reels (~2500 feet of tape) but some smaller. Mostly 800 bits/inch, but some 1600. Some Black Watch, many other brands. All are used; the data on them is not proprietary or secret (a lot is UARS satellite data) but I don't know generally what it is or what format it's in. Most reels include the white surround clips with hooks to hang on racks. The tapes are in pretty good-appearing shape, and were stored in climate-controlled storage since new (I believe). Shipping will be from San Antonio, TX, area code 78254. Pick-ups welcome. Please respond by email here, and tell me what you want. I can't be much more specific than "soon" about when I'll start to auction or trash, so promptness would be good (but tardiness probably won't cost you much, if you are willing to prowl auction sites for them). -- - Mark 210-379-4635 ----------------------------------------------------------------------- Large Asteroids headed toward planets inhabited by beings that don't have technology adequate to stop them: Think of it as Evolution in Fast-Forward.

13 years, 1 month

Genuine gonkulator cable

by dgriffi＠cs.csubak.edu

If anyone's looking for a gonkulator cable for your DEC VAX, check out Ebay auction number 200609594604 -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

13 years, 1 month

OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

>> However, I am not sure 5-40 UNC screws are any easier to find (at >> least not over here, as I said, even getting the 'mormal' 2-56, 4-40, >> 6-32, 8-32 is difficult). And it's not 'right'. I might as well spend >> a couple of afternoons in the garage making the right screws. > There are some application-specific wierdnesses too. For example, > tacquets on US-made piston valvesets for musical instruments are 3- > 48. Fortunately, I do have a set of taps and a die for that > thread. ??? 5-40, 3-48 etc. are all perfectly "normal" sizes (any decent hardware store will have them, although I wouldn't place any bets on finding the odd numbers at say Home Depot) And Tony, maybe instead of calling it a 6-32 you would have better luck in the UK asking for a "computer case screw." The demise of "decent hardware stores" is perhaps a different thread. Tim.

13 years, 1 month

OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

> As for the pitch, I used those pitch guages which conssit of little > strips of metal with accurately cut teeth in one edge. Alas my metric set > doesn't include 0.6mm ( which is odd, since it's common for M3.5 screws), > hut the imperial one that fits is 42tpi. 42tpi is about 0.605mm pitch. I > could beleive 0.6mm (it's not that accurate after all). The 40tpi > imperial gauge doesn't fit at all. I'd still bet a donut, that a 5-40 would fit just fine for anything without a long engagement. Tim.

13 years, 1 month

DEC Scrap

by pspan＠amerytel.net

Hi All, I thought I would post to everyone at one time with this list rather than an individual emails, for expediancy. 6 ea LA 120's with keyboards, it looked like only the #7 button missing from 1 keyboard 3 ea LA 120's w/o keyboards 6 ea Dual 8" floppy drives made by SMS 3 ea combo 8" floppy and 10 mb Hard disk by SMS 6 ea dual 10mb bernoulli drives (IOMEGA) (also have cartridges) I also have 8" floppy drive media which was DEC formatted, though digging that out might be a little challanging. I think there is enough stuff here for everyone to get a little. Phil PS Please keep in mind that this stuff has been in a non-temp controlled storage for at least 6 years!!!!

13 years, 1 month

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test-drb May 2011