test-drb July 2000

test-drb@ccmp.vtda.org

155 participants
521 discussions

by allisonp＠world.std.com

>OTOH I can't think of much I would attempt to prototype without a decent scope. Back when... My scope was a Heath 15mhz and the #@&*Q#!!! thing had a propensity for frying the HV, usually when I needed it. (this is 1974ish). Ended up troubleshooting the entire altair when first built with a VOM and a logic probe and a few of the lighted pin logic clips (very handy still!). Finally got the HV caps needed (some serious ones!) to fix it right to shoot the flaky ram and frontpannel oneshots (timing). Right after that I got the NLS MS15, a Tek 516 and sold the Heath. Actually for most times I need a scope it's either enough (near overkill) that the B&K2120 20mhz dual trace does it well or I need a real killer >200mhz DSO, very rarely inbetween. I still use the NLS MS15, it's still in good shape and is fine for things where portable is handy. What I do have in quantity is multimeters both analog and digital. I find that each has it's attribute. For example the RS first design DMM, the only one for it's class with current ranges! You pay a bomb for a good DMM with current ranges or they only go to a few hundred mA with It's a must for proto work that will be portable. Allison

24 years, 9 months

OT: Looking for a couple of modern things . . .

by cfandt＠netsync.net

Hi everybody, Briefly, I'm requesting two things here although they're less than 10 yrs old. This is a good venue, I think, to initiate private replies to these requests. 1.) I've recent got several ASANTE' networking parts. I'm requesting a copy of any documents or other info on these. Their website has no docs for these apparently obsolete products, naturally. They are: a.) A couple of FriendlyNET adaptor pods: They are small palstic boxes (~2" x 3") with an RJ-45 receptacle on one end and a 1 meter cable with a 14 pin micro-D connector at the end. Looks like the micro-D (my term for it) evidently plugs into a port on a laptop or other such small computing appliance. b.) A 10T HUB/8 8-port hub. Yes, there's an 8-port hub on their website as an existing product but mine is an older unit with a BNC and AUI port connector in addition to the 8 RJ-45's and an RJ-45 OUT port. No other identifying marks except for a s/n: 630D0995. 2.) Anybody have a distribution of AutoCAD LT for Windows 95 FS? I'm looking for a transferable copy (license-wise transferable). This could be either a new old stock (NOS) copy from a store's back shelves or one that somebody tried out and didn't want to use and can pass on the whole license, box, docs, CD, etc. I'm trying to be a little economic and save some hard-to-find money by getting a used/obsolete version. Reply off list of course. Thanks for your help. Regards, Chris -- -- Christian Fandt, Electronic/Electrical Historian Jamestown, NY USA cfandt(a)netsync.net Member of Antique Wireless Association URL: http://www.antiquewireless.org/

24 years, 9 months

Want to trade

by allisonp＠world.std.com

Mike, >>>VAX VMS on a laptop maybe with DECwindows Ah, that would have to be alpha powered as there are no vax systems I know of that made it to taptop status. Allison -----Original Message----- From: Mike <dogas(a)leading.net> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Sunday, July 23, 2000 11:15 AM Subject: Want to trade >I'd like to start trading gear to lighten the load and focus the ole >collection. The list of stuff I'm looking for is at: >http://users.leading.net/~dogas/wanted.html > >If ya have anything there and will trade it for something, please let me >know. > >Thanks >- Mike: dogas(a)leading.net > >

24 years, 9 months

Rack mount for ISA bus

by rmeenaks＠olf.com

Hi, I am looking for a rack mount for ISA-based cards.? Anyone know where I can pick one up.... Ram

24 years, 9 months

What is it?

by cmcmanis＠mcmanis.com

There is some sort of VAX on E-bay that I've never seen before. I'm wondering if it is something without the skins or one I never heard of. The URL is <http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=388134861> It looks like it has several S-box type chassis at least three tape drives etc. All for the low low price of $1000 :-) --Chuck

24 years, 9 months

RSTS/E BASIC Plus tapes to read

by jfoust＠threedee.com

In a delightful coincidence today, I picked up a stack of a half-dozen nine-tracks for $1. Their labels indicate they belonged to my former boss at a department at the UW-Madison, and one was even labelled with the name of a series of BASIC programs I worked on circa 1983, even though the tapes are dated 1986. It's labelled "DOS format 1600 bpi 9tr formatted ASCII 256 b/record". It's a Memorex 6250 bpi tape. I'd love to dump the files to contemporary media. I have no idea what sort of compensation would be appropriate. For starters, I'd be glad to give five of the six. Oh, I know, nine-track tapes are $1 per Dumpster. How about a few dozen organic farm eggs from Wisconsin chickens? OK, maybe cash. - John

24 years, 9 months

Un-wirewrapping (and re-wirewrapping) a PDP-16

by Anthony.Eros＠compaq.com

Well, I recentlly brought home my new (to me) PDP-16 and I can't wait to start building projects with it. First though, I need to unwire the existing configuration. I'm documenting it, with an eye towards some time understanding the original purpose of this unit. Does anyone have any suggestions or pointers for tools and techniques for un-wirewrapping and subsequently wrapping new projects? -- Tony

24 years, 9 months

Scope use...

by allisonp＠world.std.com

From: Dwight Elvey <elvey(a)hal.com> > I tend to disagree. The order of useful tools I use are >oscilloscope, analog meter and DMM. I use the oscilloscope >as a logic probe. It has a nice little light that tells me Ok that is a hybrid machine, still your using the logic probe function as the leader. I have scope handy and use them hard too. However, 30+ years of troubleshooting (some of them for profit) and teaching it I hold the scope for last save for analog and even then I've done other things first. I'd suggest that learing how to use more basic tools fully and understand them completely before a scope is not a bad thing. Allison

24 years, 9 months

Other useful test equipment (was: RE: Scope use...)

by CordaAJ＠nswc.navy.mil

Another useful piece of equipment is a multi-channel logic analyzer. Most of these units can read out pulse-timing directly, and will provide an invaluable way to display TTL signal patterns and relationships. Now, before anyone flames me, I will admit that new versions of these can cost multiple thousands of dollars, but I've noticed that a significant number of older units are showing up at hamfests for << $200. (I ran across a Tek. DAS analyzer at the Trenton Computerfest for <$25.00) These older units are becoming useless for new and/or cutting-edge hardware development, and are being dumped by a number of hardware development firms, since most of them can't sample systems with clocks > ~10-20 Mhz reliably, but for the kind of antique-system tinkering most of us do, these can be quite a help! The one thing you should look out for when buying one is to make _certain_ it comes with a set of test pods/cables/probes. A podset can be impossible to locate after the fact, and may cost you a horrendous amount of cash if you try to order them from the original manufacturer. Also, I suggest that you stick to analyzers made by larger companies such as HP and Textronix. You'll have better luck finding docs and getting help >from other hobbyists that way. -al- -acorda(a)1bigred.com > -----Original Message----- > From: allisonp(a)world.std.com [mailto:allisonp@world.std.com] > Sent: Friday, July 21, 2000 1:17 PM > To: classiccmp(a)classiccmp.org > Subject: Re: Scope use... > > > hi, > > think of an oscope as a graphic voltmeter that plota against time. > the X axis is volts and Y axis is time. > > That is along way from troubleshooting with one. To trouble > shoot with one > you really need to have some idea of waht you can expect to > see vs what > you actually saw. Most prints do not automatically give you that. > > While a scope is handy, for fixing machines that were > formerly working a > DMM and logic probe tend to be more useful. Exceptions exist > like setting > hammer flight time on charaband printers or slice levels and > timing for > older core stacks. The latter being adjustments rather than > fixed by rules > of logic. > > > Allison > > > On Fri, 21 Jul 2000, Bill Sudbrink wrote: > > > I was going to post this request sometime, John Fousts > > post has inspired me to do it now. Anyway, I have also > > recently acquired an oscilloscope (Tektronix TDS 3012) > > and, while I have all the documentation and some notion > > of what an oscilloscope does, I really don't know how to > > bring it to bare against the several dead/flakey systems > > currently in my possession. I hope this message will > > start a "how to use an oscilloscope to diagnose vintage > > hardware problems" thread. > > > > Thanks, > > Bill > > (by the way... bills(a)adrenaline.com is now my email address) > > >

24 years, 9 months

Curta I or II calculator wanted

by Anthony.Eros＠compaq.com

I've just read a little about this calculator that was popular with road rally enthusiasts and would really like to find one. Is anyone interested in trading a Curta for, say a Teletype ASR-33 with schematics and maintenance docs or a Celestron C8 SCT? -- Tony

24 years, 9 months

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test-drb July 2000