Date: Thu, 24 Feb 1994 17:01:07 +0100
From: Thomas Sams <SAMS AT nbivax DOT nbi DOT dk>
Subject: Writing to memory on frame-grabber card.
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Cc: Thomas Sams <SAMS AT nbivax DOT nbi DOT dk>

I'm trying to address the memory on my video card (mfg + amvs) 
directly from a program. Making a pointer to the memory address, in 
the present case 0xD0000000, and then assigning values to the array 
elements works fine in Borland C. However, compiled 
by djgpp the program is unable to change the content of the video card 
memory. 

Is there some trick to be done before starting to write to the memory?

Thanks in advance, 
   Thomas Sams
   Niels Bohr Institute
   DK-2100 Denmark