X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
From: David Winfrey <dlw AT adams DOT patriot DOT net>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: BIOS 13h disk i/o buffers
Date: Mon, 05 Jan 2004 23:32:30 -0000
Organization: Posted via Supernews, http://www.supernews.com
Message-ID: <vvjt0e24br51d3@corp.supernews.com>
References: <vvjh4soe8ib093 AT corp DOT supernews DOT com> <200401052022 DOT i05KM4A6005335 AT envy DOT delorie DOT com> <vvjit3maq0rob2 AT corp DOT supernews DOT com> <200401052048 DOT i05Km5t3005614 AT envy DOT delorie DOT com>
User-Agent: tin/1.5.8-20010221 ("Blue Water") (UNIX) (Linux/2.4.23 (i686))
X-Complaints-To: abuse AT supernews DOT com
Lines: 13
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

DJ Delorie <dj AT delorie DOT com> wrote:
: 
:> Thanks.  My understanding of the 13h/02h and 13h/03h BIOS interrupts
:> is that the user-supplied buffer must not cross a 64K DMA
:> boundary. How does the DJGPP code handle this, or am I misreading
:> the BIOS documentation?
: 
: We don't handle this; it just works.  Might be old documentation.

It must be; I just tried some BIOS sector i/o with a buffer
forced to just under a 64K boundary, and it worked fine in a
Win98 DOS box. Thanks for the clarification.