Date: Sun, 23 Oct 1994 16:32:21 +0000 (O)
From: MAHMOUD AT esic DOT eun DOT eg
Subject: DJGPP vs. Windows and very strang behavior
To: djgpp AT sun DOT soe DOT clarkson DOT edu

In my lab we are concerned with building knowledge systems in agriculture.
We have different platforms and different PC brands.
 
I use djgpp 2.6.0 to compile SICStus Prolog and to code just the necessary
functions I need in my applications. These functions are mainly for 
displaying different image formats and some primitive functions which
are used by Prolog to build user interfaces.

The strange behavior:
 
 1) Prolog compiled from the dos prompt cannot run from windows dos box.
 2) Prolog compiled from the dos box runs on dos box but cannot run form dos.
 3) In GATEWAY2000 4DX2-66V running dos 6.2 and windows 3.1, himem, emm386
 and 16 mbyte ram, the graphics give fault error when running in windows
 dos box (expected).
 4) In DIGITAL DEC PC 466D2 MTE with exactly the same configuration, the
 same graphics programs run fine from the windows dos box, only in slower
 fashion than running from dos.
 
Notice that the only difference between the two PCs is the graphic card.
In GATEEWAY, it is paradise and in DEC, it is S3. Using the generic driver
or the specific driver, in GO32 environment, give the same behavior.
 
I wonder, if poeple complaining from fault error when they run their
application from windows dos box, tried to re-compile the application in the
windows dos box, including GDB and GDB-dpmi.
 
I cannot understand what is going on. I will be very happy if someone
could explain the mysteries of DJGPP with WINDOWS.
 
Mahmoud