Date: Mon, 19 Jun 1995 09:23:26 +0300
From: eliz AT is DOT elta DOT co DOT il (Eli Zaretskii)
To: jmccawle AT cs DOT uno DOT edu
Subject: RE: CD-ROM in DJGPP
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu

>   r.x.bx = info_two.rm_offset;  /* This is the segment and offset */
>   r.x.es = info_two.rm_segment; /* Of the tray_request structure  */
>
>   _go32_dpmi_simulate_int( 0x2f, &r );

Did you do this:

	r.x.ss = r.x.sp = r.x.flags = 0;

somewhere before invoking ...._simulate_int()?  This is mentioned and
explained in section 18.3 of the FAQ.