Date: Mon, 18 Oct 1999 10:32:56 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Dave Dribin <drib AT enteract DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: spawnvpe hanging and bash GPF after running non-DJGPP exe
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On Sun, 17 Oct 1999, Dave Dribin wrote:

> This particular game is Callus.  You are correct that it is a
> protected-mode program.  This is what it displays at startup:
> 
> PMODE/W DOS Extender v1.33

Sigh...  This is a known problem with (at least some versions of)
PMODE/W: it doesn't seem to unhook Int 31h on exit, leaving it to
point to void.

> Finding a replacement is difficult.

Try to find a different (newer?) version of PMODE/W.  If PMODE/W is
actively supported by its vendor, try mailing them or looking at their
Web site.

> Is there anything the launching program can do to save and restore
> Int 31h?

Sadly, no.  Since restoring an interrupt vector requires a call to
another function of Int 31h, this is a catch-22.