From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: trouble accessing dos high memory
Date: Thu, 22 May 2003 12:39:40 CDT
Organization: Rice University, Houston, TX
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> the D page (in which data from the acquisition card is stored in
> 4-byte words), which doesn't work.  The symptom is that data read from
> memory and written to screen bears little or no resemblence to the
> data that should be stored there from the acquisition card, and

The code looks OK at first glance.  

Does it work under DOS (not Windows)?  It could be that Windows is 
interfering with you reading the memory.  I would make sure you don't 
have EMM loaded (safe mode command line boot, or from a floppy).