From: Matthew Mastracci <mmastrac AT acs DOT ucalgary DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: Low-level access
Date: Sun, 12 Jan 1997 00:57:48 -0700
Organization: The University of Calgary
Lines: 17
Message-ID: <Pine.A41.3.94.970112005041.31292A-100000@acs2.acs.ucalgary.ca>
NNTP-Posting-Host: mmastrac AT acs2 DOT acs DOT ucalgary DOT ca
Mime-Version: 1.0
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

     I'd like to create a hardware-interaction-intensive program, but I'm
afraid of all the overhead involved with port I/O.  From my understanding,
any program not running at ring-0 invokes an exception error with port
I/O?  I believe I know the fastest way to to access my graphics memory,
but as I'll be needing the port accesses to go hand-in-hand with the
memory accesses, I'd like to know the fastest way to do it.  Thanks in
advance,

PS: If I've picked up some misinterpretation of pm-programming, please
feel-free to correct me!  :)

/\/\att /\/\astracci                  mmastrac AT acs DOT ucalgary DOT ca

GCS/GE    d- s+:+ a--- C++++ UA P+ L E-- W+ N++ o K+ w+ O M- V 
          PS++ PE++ Y+ PGP t+++ 5+++ X++ R++ tv+ b+++ DI++++ I 
          G++ e h r* z?