From: Jeff Weeks <pweeks AT execulink DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: port access in DJGPP
Date: Thu, 26 Jun 1997 12:57:10 -0400
Organization: Code X Software
Lines: 21
Message-ID: <33B29F66.204C3DD3@execulink.com>
NNTP-Posting-Host: ppp14.mercury.execulink.com
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Hi everybody,

I've heard about how slow port access is, but now I have first hand
experience.  I wrote some Ultrasound (GUS) code in DJGPP which works
exclusively using the GUS's base port, and it is very very slow.

I'm wondering, does DJGPP just back to real mode to do port access? 
(forgive my limited knowledge of pmode).  I tried using the alternate
cwsdpmi to run in ring 0, but port access didn't seem much faster.  I
guess I use too many port operations (there are a ton of 'em).

Anyway, that's all I wanted to know.
Jeff

--------------------------------------------
            - Code X Software -
       Programming to a Higher Power
  
  email: mailto:pweeks AT execulink DOT com
  web:	 http://www.execulink.com/~pweeks/
--------------------------------------------