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From: levi@localhost.nc3a.nato.int
Subject: Bug in Delay
Date: 23 Apr 2001, 20:48:11

> Date: Mon, 23 Apr 2001 17:27:16 +0200
> From: Frank Heckenbach <frank@g-n-u.de>
> > 
> > You could use delay() on plain DOS and usleep() on Windows and OS/2.
> 
> So, how to distinguish them? -- I suppose that's in the FAQ or
> something, so perhaps some other DJGPP user can tell me how to do it
> or send me some code.

Function 1600h of Int 2Fh returns info that can be used to see if you
are running on Windows (and on what version of Windows).  Ralf Brown's
Interrupt List has all the details.  Here's a working code fragment
(from the Emacs distribution's dosfns.c file) that is used in the
DJGPP port of Emacs to set the Lisp variable dos-windows-version:

  /* If we are running from DOS box on MS-Windows, get Windows version.  */
  dpmiregs.x.ax = 0x1600;	/* enhanced mode installation check */
  dpmiregs.x.ss = dpmiregs.x.sp = dpmiregs.x.flags = 0;
  _go32_dpmi_simulate_int (0x2f, &dpmiregs);
  /* We only support Windows-specific features when we run on Windows 9X
     or on Windows 3.X/enhanced mode.

     Int 2Fh/AX=1600h returns:

     AL = 00:  no Windows at all;
     AL = 01:  Windows/386 2.x;
     AL = 80h: Windows 3.x in mode other than enhanced;
     AL = FFh: Windows/386 2.x

     We also check AH > 0 (Windows 3.1 or later), in case AL tricks us.  */
  if (dpmiregs.h.al > 2 && dpmiregs.h.al != 0x80 && dpmiregs.h.al != 0xff
      && (dpmiregs.h.al > 3 || dpmiregs.h.ah > 0))
    {
      dos_windows_version = dpmiregs.x.ax;
      Vdos_windows_version =
	Fcons (make_number (dpmiregs.h.al), make_number (dpmiregs.h.ah));

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