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From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: memmaping video memory?
Date: Sun, 29 Oct 1995 00:48:49 CDT
Organization: Rice University, Houston, Texas
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Reply-To: sandmann AT clio DOT rice DOT edu
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To: djgpp AT sun DOT soe DOT clarkson DOT edu
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> video memory into the programs address space under v2?  
> I'd like to be able to directly access video memory
> without playing with the segment registers.

sys/nearptr.h contains the goods.  See example in tests.
You currently must reload the pointer after any code 
which potentially calls malloc() - but an alternate sbrk()
is coded - umm in debugging I guess - which should 
remove this restriction.  You do loose pointer range
validation checking enabling near pointers, so you can
scrogg things bad.