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
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?

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