To all classic collectors out there:
I have 2 pieces of
Microsystems International MF8008
which I want to sell.
My location is Germany.
Any serious offers by e-mail are welcome.
Best regards,
Michael
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After the LUG meeting this evening at a Pub, I learned about a Phillips
beige box with a pair of 8" floppies being used as a coffee table.
Any guesses as to what it could be?
I'm thinking of trading a AS400 9404, or IBM PC 500 server to take over
as a coffee table.
I dropped Leo a line and he replied - he's in Montreal. Somebody
oughta grab 'em....
Not associated, reply directly, blah blah blah.
Doc
From: Leo <flintsoft(a)NOSPAMvideotron.ca>
Newsgroups: alt.sys.pdp11
Subject: PDP 11s available
Date: Tue, 05 Nov 2002 20:31:37 -0500
I just picked up a couple of these old machines as scrap... not
exactly sure of the model.
They have 2, 5" floppys in front, and a small panel with 4 push
switches, and a couple of other switches. They fit a 19" rack and run
on 120v. They have a ton of db25, rs232 ports on the back.
They were running a custom C program and a debugger for a company,
along with the standard operating system. They had at least 3
terminals and 2 printers and a bunch of machine processes running
electrical devices. Something like 18 devices on rs232. One machine
was a hot standby.
I know they were running with LA120 printers and a few screens I
forget the number...191 maybe??, none of which is available... They
were operating last I know, but were simply turned off and replaced.
(by a crappy 386PC network!!) They have been sitting in a warehouse
for the last 8 years, and were thrown out to make room.
They are tremendously dirty!! Looks like parts from a coal mine!! And
they weigh a ton!!
If I had the monitor/keyboard I'd run them for fun, but I don't have
the time to persue another hobby!! And I don't know if the dirt has
ruined the floppys.
Anyone have any interest in this stuff? Also a box of junked 120
printer parts?
Thanks
Hi Pat,
I'm assuming that your laser is helium-neon laser. If so, then if it's 23 years old it almost certainly has what they refer to as a soft seal between the electrodes and glass tube. The problem with the soft sealed lasers is that the helium atoms are small enough that they slowly leak out of the seal. When they do, the mixture ratio changes and the ignition and operating voltage goes up until the laser will no longer operates. That's what it sounds like is happening with your laser. Your's sounds like it's it border line in that the PSU firing voltage can make it fire but the operating voltage isn't high enough to keep it operating.
Further you can't just use a resistor as a dummy load. The laser tube is similar to neon and floresent lights in that it has a negative resistance. That is it has a certain amount of resistance until it fires and then the resistance decreases dramaticly. You have to use a ballast with such devices or else the current will increase drasticly and almost instantly burn out the device. The ignition voltage will be on the order of 20,000 volts but the operating voltage will be roughly 12,000 to 14,000 volts.
Be careful using a scope around these things. It probably isn't made to handle nearly the kind of voltages involved in the laser. You need a good high voltage probe for checking these things. You can use one made for TV repair. They're fairly easy to find and are reasonably priced.
If you send me the brand and model tube I may be able to tell you if it's a soft sealed tube and other details.
Joe
At 04:38 PM 10/30/02 -0500, you wrote:
>I know this is a bit OT, becuase it's not really computer related, but the
>hardware is at least 23 years old, so that's my excuse for posting to the
>list...
>
>I've got a 35mW HeNe Laser + Power supply that I picked up today for next
>to nothing. It seems to be having some problems - the laser (somtimes)
>blinks a few times when I first turn it on, and then stops. From the
>sound of the power supply it's either a loose connection (which I doubt
>after opening it up and taking a good look around) or there's a problem
>with the power supply.
>
>Now, I've never really worked on a HV power supply before, and I'm trying
>to be careful when I play with things. First off, does anyone have a
>general idea of what sized dummy load ("resisitor") I should try haning
>off of the HV output to properly load it? I noticed that the laser tube
>has 3x27kohm resistors in series, would a couple watt approx 81kohm
>resistor be a good idea?
>
>Also, does anyone have an idea for a failure mode to look for? I've got
>an O'scope, dmm, and various other tools at my disposal, but no
>'authentic' HV test/mesurement gear.
>
>I'm just looking for general guidelines.
>
>Thanks!
>
>Pat
>--
>"The Microsoft/IBM FORTRAN was adequate for teaching FORTRAN 77. But the
>performance was AMAZING! It could actually take longer to run a benchmark
>like sieve of Erastothanes with compiled FORTRAN than with interpreted
>BASIC."
> -- Fred Cisin (XenoSoft)
>http://dilbert.com/comics/dilbert/archive/images/dilbert2040637020924.gif
>
>
>
>The idea behind this scam is to file suites they fully know they would
>loose in court. A messy legal tactic, but
>hardly a problem with the U.S. I.P. laws (which are far better than most
>others).
You forgot the most important detail. You file suits you know you will
loose... but only while offering a settlement that is profitable for you,
and cheap enough that it is cheaper for the other person to settle, then
to defend the BS lawsuit.
-chris
<http://www.mythtech.net>
Does someone have the description of what the status codes in the eight LEDs mean ? I know there is a 4000 VLC user guide on-line but that isn't detailed. I also know that a working VAXstation has none of these lights on after power-up completes.
Ethan Dicks wrote:
>My one and only experierience with analog computing was a
dedicated
>device (no patch panel) that calculated energy reserves for the
>planet. It had an LED counter for the year and numerous dials
for
>amount of driving, heating, electricity usage, etc. Physically,
>it was about 3" thick and several feet square. I remember
trying
>out a variety of simulations on it when it was at the local
science
>museum, COSI, some summer between 1976 and 1980.
I remember this as one of those fuzzy childhood memories. In
fact, I was never sure that it actually existed until reading
this message. I know I only had a few minutes to play with it,
sometime in the 70's. I remember asking "what do you do when the
energy runs out?" :) I thought it might have been developed in
the aftermath of the "energy crisis" in 1973.
I can picture the wooden frame, and you could see some of the
circuitry through the front I think...
I hope someone finds a picture of that thingy.
-Frank
>From: "Rich Beaudry" <r_beaudry(a)hotmail.com>
>To: cctalk(a)classiccmp.org
>Date: Mon, 04 Nov 2002 19:18:02 +0000
>
>The AIM-65 has been tested.
I want the AIM-65. I started in computers around 1980 with a KIM.
I do not need it forever; just a month or so to become familiar
with operating it. I can then pass it on to someone else.
If I do get it then I will try to repair it.
--
Paul R. Santa-Maria
Monroe, Michigan 48161
Sellam Ismail wrote:
>The locations I am considering for VCF East 2.0 are Providence, RI, Boston
>proper, or New York City. Basically, somewhere with a large >population
>center, that is central to a greater population center, and >where a lot of
>vintage computer enthusiasts would easily find their >way to.
Any of the above would suit me. I would bring Big Iron.
I would sign up for yer list, but vintage.org seems to have gone AWOL for
now...
Mike
http://www.corestore.org
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Anyone have a extra or unwanted AC adapter for a Gateway 4 Handbook
(486sx-25)? I found this little jewel down at the warehouse yesterday
(forgot I had it) and would like test it out but the adapter port is a
really strange looking one. I do not have anything to hook up to it and the
battery is long dead.
