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From: Charles Sandmann <sandmann AT praline DOT no DOT NeoSoft DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Locking memory for interrupt routines.
Date: Wed, 20 Sep 1995 20:59:50 CDT
Organization: NeoSoft Internet Services +1 713 968 5800
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References: <811601482 DOT 13133 AT alphdyn DOT demon DOT co DOT uk>
Reply-To: sandmann AT clio DOT rice DOT edu
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway: from newsgroup comp.os.msdos.djgpp

> What I am finding is that my lock function works in a windows DOS box and
> fails when I run the program directly from DOS.

You are not adding the base of the CS/DS selector to the memory, so 
you are locking the wrong place in memory (conventional memory in your
example).