Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!inco!alembic!bill
From: bill@alembic.UUCP (Bill Hatch)
Newsgroups: comp.unix.microport
Subject: uport V386 fp
Message-ID: <3452@alembic.UUCP>
Date: 30 Apr 89 14:18:57 GMT
Reply-To: bill@alembic.UUCP (Bill Hatch)
Organization: Alembic Systems
Lines: 56

Subject: uport 386 fp problems
About 6 months ago there were several news articles about 
floating point problems with microport V386 with and without
the 80387 coprocessor.  My specific problems (without 80387)
were solved when microport/john p. shipped me an engineering
update to the dos merge kernel in december.  

I purchased a hardware fix to the 80387 problem (erratum 21) from
Ironwood Electronics.  However, in the process of reinstalling the
80387, I accidently burned out the chip.  Therefore I was unable
to test the Ironwood fix.  (Note: the hardware fix from Bell
Technologies was not compatable with my ALR 80386/220).  

We tested uport 3.0e on a compaq 386/20 portable (with 80387)
and there was no problem as long as only one process was using
floating point operations.  If 2 processes used floating point,
then the os crashed.

My company is in the process of purchasing several 80386 machines
with 80387 coprocessors and sockets for a Wytek.  One of the
machines is a Hewett Packard (Vector ?) and the others are by
Wells American.  I would like
to get some answers to the following questions:

1. Has anyone installed the Ironwood hardware fix; and did it fix
the problem?  On what hardware configuration and what brand/release
of 80386 Unix?  Also the Bell Technologies hardware fix ?
Does anyone have Ironwood's address or phone - i lost these in a
disk crash last month.

2. Is this strictly a Microport V386 problem or is it a hardware
(80383 chip) problem present to disrupt all varieties of 80386
Unix unless hardware remedies are applied ?

3. Has anyone managed to get any version of V386 unix working
with an 80387 so that more than one process can do floating point
operations on a "generic" AT386 machine?  (Our intention is to
use our unix machines as multi-user software development machines.)


Our busines depends heavily on floating point intensive applications.
I have been successful in persuading the management to try V386 Unix on
2 projects as a replacement for individual 8086/8087 DOS clunkers.  
Thus, I will be very grateful for any information in response to the 
above questions and comments on related issues. 


bill hatch
uunet!bts!bill

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