NXSYS          New York City Subway Interlocking Simulator.
Copyright (c) 1994, 1995,1996 Bernard S. Greenberg
All rights reserved.
18 June 1995  updated 28 October 1996


16-bit NXSYS Setup instructions (there is a 32-bit version available
in nxsys32.zip at this same location). PLEASE READ README32.TXT
FOR ESSENTIAL DIFFERENCES FROM THE BELOW IF YOU ARE USING IT.

  If you received this as a zipfile, unzip this archive in dedicated directory,
    or, if you received a diskette, just copy all these files into one.
  Set up a Program Manager icon for nxsys.exe.  Specify the "working
    directory" as that directory.
  These other files must exist in that directory if all is to work the
    right way by default.
  If d:\SUBWAY is the directory, then a Program Manager command line of 
    d:\SUBWAY\NXSYS d:\SUBWAY\PROGMAN.TKO
    will cause Progman St. Interlocking to be brought up by default,
    which is wanted in most cases.

Start up NXSYS and click on Help | Usage/Help to learn more.

These five files must be retained for the system to operate:
(different files are supplied for the 32-bit version).

NXSYS.EXE   is the Windows executable for the interlocking simulator.
PROGMAN.TKO is the compiled object file of Progman St. Interlocking.
NXXLKG.HLP  is the system help, which contains extensive background reading.

Other optional files supplied are:
PROGMAN.TRK is the source for that, which can also be loaded and run by NXSYS.
DEMO1.XDO    is a demo script to be called up by File|Demo.
README.TXT   this file
ISLINGTN.TRK A second, more complex interlocking, source.
ISLING16.TKO the compiled form of Islington interlocking.
DISPTKO.EXE  A program which displays information about compiled
	     interlocking files.

"Microsoft" and "Windows" are trademarks of the Microsoft
Corporation. "NX," referring to a scheme of railroad switch and
signal control, is a trademark of General Railway Signal, Inc. (a
unit of General Signal).  Neither this software nor its documentation
has been authorized, approved, or verified by them or any other
railroad signal concern or the New York City Transit Authority or its
successors.

This software is offered free of charge, on an "as-is" basis.  It is
thought to be relatively bug-free, although bug reports will be
fielded at the address below, but no response in any given time
promised.  No representations, warranties, guarantees, or claims
about operability or suitability for any purpose are made.  This
software is intended for educational, demonstrative, and
entertainment purposes only, and is not suitable for use for control
of actual railroads or other life-critical missions.  The relay
circuit designs, while based on real circuits, have not been
verified, may contain errors, and certainly contain simplifications,
and are not to be used for the control of real railroads or other
life-critical missions. The author assumes no responsibility for any
damage, injury, or harm resulting from use or misuse of this program,
its data, its documentation, or the models presented.  The author
assumes no responsibility for errors resulting from corruption of the
distribution media or files.  You may use and share this program as
you wish, but are not permitted to incorporate this program or its
parts in any distribution, collection, or commercial product without
the consent of the author.

Info about this application may (presently) be found online at
http://www.basistech.com/bsg/nxsys.htm, although full info is in
the helpfile described above.

Bernard S. Greenberg (INTERNET: bsg@world.std.com)
