It's quite possible that the cache supply voltage and the main memory supply
voltage were set to different values while the board didn't know that and
hooked them together. I did that about 5 years back. That same mobo used a
cache simm which could be plugged in backward. That wasn't good either.
Trying to fix the thing will take a lot of time and won't yield results
worth having. Best to follow the suggestions below.
Dick
-----Original Message-----
From: John Foust <jfoust(a)threedee.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Friday, December 24, 1999 8:15 AM
Subject: Re: OT: Need PC MB help!
>At 08:53 PM 12/23/99 -0800, Sellam Ismail wrote:
>>Anyway, I have a bad pentium MB that I'd like to use for parts. The
>>transistor that blew is HB1084 5C (what is that?) The one on the salvage
>>MB is D45H2A. Are they compatible?
>>I'm hoping one of you electronics gurus can help me out. I have to get
>>this system rady cuz Santa's got to deliver it tomorrow.
>
>I called Santa's workshop, and they said it would be easier to
>get the nephew a cheap Celeron motherboard from any ol' computer
>shop in your well-stocked neighborhood, and fix the other MB some
>other day.
>
>Something went wrong to blow the transistor. The transistor became
>a fuse. Replacing the transistor doesn't fix the problem. When the
>second transistor blows, you will receive enlightenment.
>
>- John
>
DAMN DAMN DAMN!
I'm putting together a PC for my nephew. Everything is going fine, then
KAPOW! A power transistor on the motherboard blows. I have no idea why.
All I know is the last thing I inserted before it blew is the cache RAM
DIMM thingy that goes next to the Pentium processor (at least that's what
I think it is).
Anyway, I have a bad pentium MB that I'd like to use for parts. The
transistor that blew is HB1084 5C (what is that?) The one on the salvage
MB is D45H2A. Are they compatible?
I'm hoping one of you electronics gurus can help me out. I have to get
this system rady cuz Santa's got to deliver it tomorrow.
Any help will be greatly appreciated and will be rewarded with amazing
amounts of karma!!
Please reply to sellam(a)siconic.com.
Sellam International Man of Intrigue and Danger
-------------------------------------------------------------------------------
Looking for a six in a pile of nines...
VCF East? VCF Europe!? YOU BETCHA!!
Stay tuned for more information
or contact me to find out how you can participate
http://www.vintage.org
At 08:53 PM 12/23/99 -0800, Sellam Ismail wrote:
>Anyway, I have a bad pentium MB that I'd like to use for parts. The
>transistor that blew is HB1084 5C (what is that?) The one on the salvage
>MB is D45H2A. Are they compatible?
>I'm hoping one of you electronics gurus can help me out. I have to get
>this system rady cuz Santa's got to deliver it tomorrow.
I called Santa's workshop, and they said it would be easier to
get the nephew a cheap Celeron motherboard from any ol' computer
shop in your well-stocked neighborhood, and fix the other MB some
other day.
Something went wrong to blow the transistor. The transistor became
a fuse. Replacing the transistor doesn't fix the problem. When the
second transistor blows, you will receive enlightenment.
- John
A recent trip to an office supply store turned up boxes of 8" & 5.25" floppy
disks. Two of the 8" disk boxes (original IBM!) are opened, one is almost
full, the other only has 1 disk in it. There are also 4 or 5 other boxes of
disks (3M) that are *still factory sealed*
They also have many boxes of 5.25" floppies, some are opened, & come in a
variety of different manufacturers.
Here is the Phone #, E-mail, & address of the store where I found them:
Address:
Hengst Printing & Supplies
155 West Travis
La Grange, Texas 78945
Phone Number:
1-800-468-1270
E-mail:
Graphtex(a)aol.com
Better act fast! Because when the disks are gone, they are gone!
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
it's a 7 or 9 track tape drive exerciser for ampex, kennedy, or
pertec (unformatted) drives.
the three cable style drives were pretty common and were an alternative
to 'pertec formatted' two cable interfaces.
--- Wayne Smith <wsmith(a)gj.com> wrote:
> I just came across fairly clean photocopies of a few old IBM manuals. They
> are:
>
> IBM Electric Punched Card Accounting Machines - Principles of Operation -
> Automatic Summary Punches (1946) 25 pgs...
Too old for what I need. I _am_ looking for service manuals related to the
IBM 026 card punch. I have one that needs some attention.
Thanks,
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
I just came across fairly clean photocopies of a few old IBM manuals. They are:
IBM Electronic Statistical Machine Type 101 - Preliminay Manual of Information (1949) 70 pgs.
IBM Electronic Statistical Machine Type 101 - Principles of Operation (third rev. 1949, 1953) 90 pgs.
IBM Electric Punched Card Accounting Machines - Principles of Operation - Automatic Summary Punches (1946) 25 pgs.
IBM 513, 514 Reproducing Punches - General Information Manual (1945, 1958) 30 pgs.
If anyone is interested in copies at cost (.03/pg.; $6.50 total) + postage, and is willing to indemnify me on the copyright issue :-), let me know.
-W
"NOTE--These panels are from machines that have already been scrapped, many more than two decades ago. I too would have liked to see these machines in running condition, but given their size, power and air conditioning requirements, etc., I doubt that there would have been very many takers."
Your kidding me, right? I am partnering in with someone on this list to restore/sell the next 360 I get and I and my partner have received *very* serious offers. Please e-mail if you ever find any 360/1401 parts. I am sure to need them.
john
http://www.pdp8.com/
OK, question of the day, how many RAM boards can a MicroVAX handle? It's
living in a Sigma Rackmount chassis.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)aracnet.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
