Date: Thu, 29 Oct 1998 18:45:39 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: Seyil Yoon <wings AT interlog DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: Extended int 13h calls (e.g. ah=42h)
In-Reply-To: <3637841E.6579850F@interlog.com>
Message-ID: <Pine.SUN.3.91.981029184118.19933Q-100000@is>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Reply-To: djgpp AT delorie DOT com


On Wed, 28 Oct 1998, Seyil Yoon wrote:

> Regs.h.ah    = 0x42;
> Regs.h.dl    = ucDrive;
> Regs.x.ds    = ulPacketBufferSeg;    //    Segment number obtained from
> __dpmi_allocate_dos_memory
> Regs.x.si    = 0;
> 
> __dpmi_int(0x13, &Regs);

Insufficient details.  Please post a more complete fragment that in 
particular shows how did you allocate the DOS buffer and how exactly 
was ulPacketBufferSeg computed.  ``Segment number'' doesn't explain 
enough to guess what might have gone wrong.

You might also benefit from reading section 18.5 of the latest version 
2.11 of the DJGPP FAQ list, which lists some gotchas in code that calls 
real-mode services from DJGPP programs.