Tandy Professional Forum   Section: Tandy 2000
Subject: UP grading mother board   Total messages: 5
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#62366   2 Replies   08/18/96   13:46:21
From: DAN WILHITE, 102716,3006
To:   FREEMAN LIBAN, 104603,720

     I noticed that your message was a couple of months old, and
did not see any responses. So if you have abandoned hope  of
getting a reply, I will also be in the same ship.

     I too, have a 2500 RSX  with a 80 meg hard drive, 386xe ram
chip. Running on dos 5.0 and of course windows. 3.?  ( It seems
that the new crop of computer tech's can't doo anything unless
itis running on 6.0 )
     I expanded my ram with 2 -  4meg  sims . reportedly giving
me 8 meg of ram.
     However, it seems that one of the chips is faulty and whin
I try to run any programs using the full 8 megs ram, the system
crashes repeatedly until it self adjusts to 4 megs. at this
point, everything is hunky dory.  ( sorta )

     I find  that I am forced to keep my main computer on all
the time because when I first boot up, it gives me this warning
message - memory mismatch- read 8880 expecting 8080. or is that
8088 - sense it is a few days sense I  went through this routine,
I honestly don't remember which.
I suppose I should go back and check in order to be accurate,
but if like yourself, I don't get any response, whats the use?
     But on the outside chance that you did, but I just didn't
see it, I am posting this message.

DAn / ARK
      Now I am honest enough to admit


#62367   Reply to #62366   1 Reply   08/19/96   03:04:10
From: Niels Horn, 100275,2015
To:   DAN WILHITE, 102716,3006

Hi Dan,

Try swapping the two SIMMs and see if anything changes. This once
worked for me!

Niels


#62370   Reply to #62366   1 Reply   08/19/96   22:55:07
From: Robert  F. Runyan, 104217,3377
To:   DAN WILHITE, 102716,3006

Dan,
    Are you sure that you have both SIMM chips the same???
Meaning are you sure one is not Parity and the other
Non-Parity!!!!
    In theory it should not make a difference with 72 pin Simms
but in actually that is one of the biggest problems we have when
we sell memory at the store.

    Double check and make sure......
                                   BobR


#62400   Reply to #62367   08/29/96   21:10:09
From: DAN WILHITE, 102716,3006
To:   Niels Horn, 100275,2015

>>Try swapping the two SIMMs and see if anything changes. This
once worked for me!<<

     Chuckle ! that was the first thing I thought of, and I
amusingly watched as every tech I took it to did the same thing.
I am convinced that one of the simms is either bad, or the wrong
type.

DAn / ARK


#62861   Reply to #62370   02/04/97   22:20:16
From: Morgan E. Ford, 72134,515
To:   Robert  F. Runyan, 104217,3377

If you get this, I'm looking for someone who is familiar with
tandy innards.  I'm trying to identify a motherboard i bought
recently   PN is 1700444-8 or 8709994.  The chip is a 386SX-20
and the board appears to have been made in 1990.


