Date: Fri, 24 May 1996 14:40:16 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: Michael Edwin Hommel <mhommel AT trumpet DOT aix DOT calpoly DOT edu>
Cc: djgpp AT delorie DOT com
Subject: Re: COM port access
In-Reply-To: <4o2op8$ncg@trumpet.aix.calpoly.edu>
Message-Id: <Pine.SUN.3.91.960524143749.5365I-100000@is>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


On 23 May 1996, Michael Edwin Hommel wrote:

> avail.  So finally I wrote basically a clone of this talk program, but in 
> DJGPP as opposed to the real-mode TASM used by the other guy.  What it 
> comes down to is his works, mine doesn't.  In fact, mine managed to crash 
> the computer so hard, it wiped out the CMOS values (don't tell the guys 
> who run the lab!  I fixed it though- good thing there were 20 identical 
> computers in there).  So it seems to me that the flaw in mine (after 
> retrying hundreds of different ways) is simply that it's in protected 
> mode.  That's it.  I am using standard inportb and outportb calls to do 

Be sure to read Chapter 18 of the DJGPP FAQ list (available as 
v2/faq200b.zip from the same place you get DJGPP).  It explains some 
potential problems in writing interrupt handlers and other low-level 
programming with DJGPP.