I posted this a few weeks back, but noone answered, so I'll ask it
again.
There is a certain Macintosh 5400/180 at my school whose hard drive
crashed about a month and a half ago. When it tried to start, it
wouldn't really seek, just made a ticking noise and the LED would
flash. So, we took it out, ordered another one. A few days later,
it died the same death. So now we have another one. My ethics don't
allow me to just put in a hard drive knowing it will be destroyed.
What should I do? One hint is that the Macintosh is in a soundproof
booth, and is powered from the booth, which is plugged in. But, the
mac is plugged in via a "surge protector".
Ideas? Could it be bad power? Any way to check?
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
In a message dated 98-04-29 16:12:26 EDT, you write:
<< > >> Hi. After getting a new M Board for my XT and a load of cards, I
found
> >>that
> >> my Power Supply's now completely dead. So, where to I start? No fan,
> >>moves
> >> a turn or two, I know that the power connections good.
>
> Could you simply be overloading it? >>
as long as its an xt power supply and not one from a 5150 pc, there should be
no problems. the 5150 was only 63watts, which was good for maybe floppy
drives. the xt has an ~80 watt power supply so there shouldnt be any danger of
overloading unless it was dodgy to begin with. ive a loaded up xt and the
power supply handles it just fine.
david
>> Hi. After getting a new M Board for my XT and a load of cards, I found
>>that
>> my Power Supply's now completely dead. So, where to I start? No fan,
>>moves
>> a turn or two, I know that the power connections good.
Could you simply be overloading it? Seem to remember original IBM XT
supplies do this when there's too much load on the system - does the
supply seem to work without anything connected to it? The fan should at
least spin then...
It's equally likely that one of the cards you've got, or the motherboard
itself is faulty in some way and is causing the supply to shut down. If
you've got a voltmeter try checking the output voltages.
Final possibility: did XT supplies have a "power good" reference line
that the motherboard tied to +12V to signal that everything was Ok?
Can't remember if this was only AT systems that provided this. If they
did it may be that your new board doesn't provide it but the power
supply expects it to (wait for someone else's words of wisdom I guess,
been a while since I've fiddled with these things - if that is the cause
though you should be able to simply tie the line to +12V and then
everything should work... :)
cheers
Jules
>
>
OK.. because I'm moving to Georgetown, Guyana, I'm using this e-mail
address to keep in contact while I'm moving. So, until June, the other one
will still be active, but in the mean time, try to send messages to
photze(a)batelco.com.bh and worldsfate(a)geocities.com .
I'm not subscribed to this list with this e-mail address, but I'll get
ClassicCmp with the other one.
Ciao,
Tim D. Hotze
---------------------------------------------------
*Tim D. Hotze Co-Founder, The Review Guide *
*http://members.theglobe.com/ReviewGuide/index.htm*
*Panel Member, The Ultimate Web Host List *
---------------------------------------------------
This is really for Sam, but I think it's worth posting to the list.
> The first speaker has been confirmed for VCF2 this September.
Does this mean you have firm dates yet? I'd like to book flights, time
off work, etc. as soon as I can...
> David Rutland was an engineer on a lesser known but very significant
> computer dedicated in 1950 called the SWAC (National Bureau of Standards
> Western Automatic Computer).
Sounds fun!
It occurs to me that I gave a small talk on the Tek 4050 series last
autumn (fall). I'd like to come to the VCF, and I could probably bring
my 4052 and some demo programs, and give an adapted version of the talk
(either in a scheduled slot or probably more suitably on a demo stand
with the machine).
Finally, Sam, could you put me on the VCF mailing list, please. I tried
to subscribe from the web page but we've just migrated to Lusedoze Not
Tolerable and Internut Exploder, with the result that I couldn't get it
to work...
Philip.
<><><><><><><><><><><><><><> Philip Belben <><><><><><><><><><><><><><>
Bloedem Volke unverstaendlich treiben wir des Lebens Spiel.
Grade das, was unabwendlich fruchtet unserm Spott als Ziel.
Magst es Kinder-Rache nennen an des Daseins tiefem Ernst;
Wirst das Leben besser kennen, wenn du uns verstehen lernst.
Poem by Christian Morgenstern - Message by Philip.Belben(a)powertech.co.uk
<> I do not think the Cray-1s used 10K ECL - I believe they were custom pa
<> and were faster (10K gates have a delay around 2 nS). Only four types o
<> chips were used in the whole beast - I think two were OR/NOR gates, one
<> was a flip-flop, and the other RAM.
Thay may have been custom but the "generation" of ECL is 10k and that
refer to parts but also a performance level.
Allison
I can't remember who mentioned they had a 1611A without probes, but I
checked it out in the lab today.
The pod with the ZIF socket and Z80 clip does have a little "stuff" in it,
but the "ordinary" microprobes are simply buffered by a little box
containing a pair of 8T37 buffers and a few decoupling capacitors. This
box is connected by a plain ribbon cable to a connector on the 1611A. If
you need to know the connections/layout, I'm sure it would be easy to
reverse-engineer.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
At 11:08 AM 4/24/98 -0400, you wrote:
>Kip, is that magazine online anywhere? I haven't heard of it myself.
>
>Sounds like you are refering us to a rather interesting read!
Try <http://www.chac.org/>. It's the official publication of the Computer
History Assn of California. I'm pretty sure it is on-line (though I
haven't actually checked myself.)
>Anybody who's got a better handle on the present population of minis and
>mainframes still in service want to give an opinion on this?
Well, I'm currently working with Long's Drugs (pharmacy chain in the
western US). They have 352 (353 this weekend) stores and each one has an
HP 3000 in it.
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
roger(a)sinasohn.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.sinasohn.com/
If this is the same University of Washington that hosts classiccmp... it's
likely that Bill Whitson would have gotten them before any of us even had a
crack at 'em. Possibly before the surplus people even got 'em, so there
would be no record... vaguely, I mean VAGUELY I remember something about him
getting Teraks... but I could have been dreaming.
Tim D. Hotze
-----Original Message-----
From: John Foust <jfoust(a)threedee.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Wednesday, April 29, 1998 6:17 PM
Subject: Re: University of Washington surplus sale?
>I wrote:
>>I found a somewhat stale lead (last November) on three or four
>>Terak computers that were sold at the monthly University of Washington
>>surplus sale. Is there anyone on the list familiar with this sale?
>
>And then several people posted "tell me more". All I know is
>I found a mention via a search engine of three Teraks that were
>about to be tossed to their surplus center, and when I called
>the surplus center (University Surplus Property Warehouse, 206-685-1573)
>they said they auction 60-70 pallets of computers each month, so
>they had no recollection of these Teraks. Someone in the UW area
>must've got them! I hope they're not dumpstered. I also hold a
>slim hope that they weren't sold, and are still for sale.
>
>See my web site for an image of a Terak. Find them and send
>them to me. :-)
>
>- John
>Jefferson Computer Museum <http://www.threedee.com/jcm>
>
