Date: Tue, 4 May 1999 11:22:24 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Francois <francois AT nothingreal DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: vesa 2.0 development
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On Mon, 3 May 1999, Francois wrote:

>     ax = 4f00h
>     es:di = ptr to buffer
>     int 10h
> 
> the int seems to works fine as at the end
> ax = 004fh
> but the buffer is not filled ...
> how to give the int the right es:di ????

The buffer needs to be in conventional memory.

I suggest to read section 18.2 of the DJGPP FAQ list which explain how
to do this.  You will also need to move data to and from the
conventional memory buffer; this is covered by section 18.4.  Finally,
section 18.5 discusses some pitfalls while using interrupts like the
VESA API that return pointers to buffers and functions.