Xref: news2.mv.net comp.os.msdos.djgpp:4188
From: mhommel AT trumpet DOT aix DOT calpoly DOT edu (Michael Edwin Hommel)
Newsgroups: comp.os.msdos.djgpp
Subject: COM port access
Date: 23 May 1996 15:27:52 -0700
Organization: California Polytechnic State University, San Luis Obispo
Lines: 33
Message-ID: <4o2op8$ncg@trumpet.aix.calpoly.edu>
NNTP-Posting-User: mhommel AT trumpet DOT aix DOT calpoly DOT edu
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

  Fair warning: feel free to flame and yell if you think I am completely 
wrong on this thing, because I probably am, but dammit, I need HELP!

  I am writing a VERY simple "networked" game.  The network in question 
is just a null modem cable from COM1 of computer A into COM2 of computer 
B.  Someone else wrote a little chat program for this network in ASM, 
which works flawlessly.  Well, I tried my game a million ways, to no 
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 
my I/O.  It seems to get past the initialization of the rs232 port just 
fine... although I just realized I did that via an inline asm "int" 
command - should that be __dpmi_intblahblah or whatever that's called?  
Or simply is there something other than inportb and outportb I should be 
using?  Or more likely, am I just WAY off here, and does somebody have 
some sample COM-port code in DJGPP they'd like to share?  I couldn't find 
any on any of the DJGPP web pages I checked.
  So does anyone have any handy advice for me?  I can't post the code- I 
only have it on the computer at school at the moment.  (And thanks to all 
the guys who helped me with my other stupid questions before!)

*****************************************************************************
* Jamul(ha-MOOL) aka Mike Hommel * "It's too bad that whole families have   *
* Head Honcho, Jamul Software    *  to be torn apart by something as simple *
* mhommel AT trumpet DOT calpoly DOT edu    *  as wild dogs." - Jack Handy             *
* http://ppp110.callamer.com     *                                          *
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