I worked with many systems back in the middle to late 80s when the 386 was in vogue. I don't recall any of them using an older 287 math coprocessor though. Here is a link to a page full of mbs and DTK did indeed make a discrete chip 386 motherboard back then. The co-processor was a 387 though.
http://www.redhill.net.au/b-92.html
best regards, Steve Thatcher
-----Original Message-----
From: SHAUN RIPLEY <vax3900(a)yahoo.com>
Sent: Apr 30, 2004 6:15 AM
To: cctalk(a)classiccmp.org
Subject: 386 motherboard with discrete logic chips only?
I talked with my friend the other day and he claimed
that 386 motherboards all used this or that chip sets;
But I vaguely remember I might once have such a 386.
It had a 287 math coprocessor and some memory chips on
board. What I can remember is that it had many logic
chips on board but I can't recall whether it had chip
sets or not. Unluckly I dumped it years ago... Could
somebody give me an answer?
vax, 3900
__________________________________
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I need two items to complete my omnibot 2000 robot. Missing are the tray and
the home base. I have searched google and eBay with no luck. The sites that
sell parts only have manuals, batteries, and chargers (from Radio Shack). It
took me a year to get a remote control for it. Anyone with an extra tray?
Thanks for your time.
Hi All,
While going through the *pile* of mail here at the office, I also
found a box filled with DEC cards. It was shipped by someone in
Wichita, KS, but no name.
I *do* remember buying this, but can't find a record of who I
bought it from. If this is you... please respond off-list, since
I can't remember whether I *paid* for it or not...
Thanks for the OT-ing,
Fred
--
Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist
Visit the VAXlab Project at http://VAXlab.pdp11.nl/
Visit the Archives at http://www.pdp11.nl/
Email: waltje(a)pdp11.nl BUSSUM, THE NETHERLANDS / Mountain View, CA, USA
>No signs of life from the PSU but there normally isn't until powerup and the
>LED lights up.
Usually the vent fan will start spinning right away. If the fan doesn't
even jerk, then the PS may not be doing anything. I've used that to track
problems in some macs before (Mac PSs tend to be "short resistant", at
least that is what I've found. If there is a short somewhere, the PS will
power itself back off rather than fry itself... in those cases, the fan
usually jerks as the PS comes on and cycles right back off)
It is starting to sound like the PS is dead.
There are no additional troubleshooting steps listed in the Apple tech
manual for the IIfx (actually, there are no troubleshooting steps at ALL
in that manual).
-chris
<http://www.mythtech.net>
I talked with my friend the other day and he claimed
that 386 motherboards all used this or that chip sets;
But I vaguely remember I might once have such a 386.
It had a 287 math coprocessor and some memory chips on
board. What I can remember is that it had many logic
chips on board but I can't recall whether it had chip
sets or not. Unluckly I dumped it years ago... Could
somebody give me an answer?
vax, 3900
__________________________________
Do you Yahoo!?
Win a $20,000 Career Makeover at Yahoo! HotJobs
http://hotjobs.sweepstakes.yahoo.com/careermakeover
>Well, if you're swapping in an identical unit, you'll not cure the
>problem. The replacement is just as marginal...
Yup... that's probably why I did LOTS of PSU swapping in the A2's :-)
-chris
<http://www.mythtech.net>
Hi everyone,
I have one of the newer plasma displays used in the IBM P70, labeled
MD480T640PG4.
I've found the pinout for the data connector, but i can't seem to find the
pinout of the power connector anywhere.
It's an 8 pins connector, with the center 3 pins missing.
Picture: http://twl.student.utwente.nl/display.jpg
As most of the caps around the connector are rated for 250V, I presume it
needs some high voltage.
There is also a small connector in the bottom left part of the board. Maybe
used for driving an indicator light?
Cheers,
Thomas
One of our number was kind enough to provide me with a copy of aztec C,
and now I and trying to
get it working. It was provided on 4 5.5" floppies, and I only have the
One 5.5" drive in
my apple, but I do have 2 3.25" drives (that each hold a little more)
Aztech seems to be stored on PRODOS volumes, so I am now trying to copy
>from all it's 5.5's to
3.25s
Is there a collection of Aztech C wisdom out on the net?
Can anyone provide a proper directory setup ?
Is it possible to compile the source C and have aztec save the assembly
it generates?
Thanks for the help.
ron.
>You mean 'at least 3rd time around'. The Apple ][ PSU is marginal, or at
>least mine was. The 5V line was rated (IIRC) at 2.5A. A mainboard,
>language card, disk controller, and 1 drive (i.e. not a very full
>machine) exceeded that on my meter. Perhaps I was just unlucky and had
>parts that took more current than normal, but I had a lot of trouble with
>the Apple ]['s PSU...
Yeah, come to think of it, I do seem to recall swapping a number of A2
PSU's back then. That was before I was willing to try component repairs,
so it was simple swaps of bad for good.
-chris
<http://www.mythtech.net>
