OpenTTD: OS/2 version
=====================

OpenTTD has been ported to work on OS/2 4.x or later (including
eComStation). The game should work as well as it does on Windows
or other platforms: the main issues you may encounter are graphics
card problems, but that is really the fault of SDL.

=========================
USING OPENTTD FOR OS/2
=========================

LIBRARIES REQUIRED FOR END USERS
--------------------------------

SDL.DLL (SDL 1.2.7) and FSLib.dll are required to use this program:
these can be downloaded from the Files section at
http://sourceforge.net/projects/openttd/ - see "os2-useful-v1.1.zip".
Version 20051222 of SDL or later is required. This can be found at
http://sdl.netlabs.org/.

Please note that earlier SDL releases will probably NOT work with
OpenTTD. If you experience problems with OpenTTD, please check
your SDL and FSLib.dll versions (both must match).

Note that to actually play the game, I have found in my own
experience that a version of the Scitech Display Drivers or its later
incarnation (see www.scitech.com) are necessary for it to work. If
you have trouble with your native drivers, try the Scitech drivers
and see if they help the problem.

KNOWN ISSUES
------------

- If an error occurs during loading, the OS/2 error message window
  is not always displayed.

A NOTE ABOUT MUSIC
------------------

OpenTTD includes a music driver which uses the MCI MIDI system. Unfortunately,
due to the lack of proper MIDI hardware myself, I have been unable to test it,
but during testing, I found that when MIDI was enabled, I got no sound
effects. I therefore decided to DISABLE music by default.

To enable music, start OpenTTD with the command line:

   openttd -m os2

If I hear enough responses that both music and sound work together (it might
just be my system), I'll have the defaults changed.

A NOTE ABOUT DEDICATED MULTIPLAYER SERVERS
------------------------------------------

To start a dedicated multiplayer server, you should run the dedicated.cmd
file. This enables OpenTTD to open up a VIO console window to display
its output and gather any necessary input. Running "openttd -D"
directly will result in the console not being displayed. You may
still pass any other parameters ('-D' is already passed) to
dedicated.cmd.

=========================
BUILDING THE OS/2 VERSION
=========================

Compiler
--------

Open Watcom 1.3 was used to build OpenTTD (earlier versions will
NOT work). See http://www.openwatcom.org/ to download it. It may
also be possible to build OpenTTD with GCC: I attempted this
before using Open Watcom, but found the tools available for OS/2
at the time to be a bit more tricky to get working.

Due to complexities in my set-up, I actually used the Win32 version
of Open Watcom to initially compile OpenTTD for OS/2. There should
be no reason of course why the OS/2 version cannot be used, and I
have subsequently built OpenTTD successfully this way.

Libraries Required
------------------

The following libraries are required. To build zlib and libpng, I
simply added the required files (watch out for sample programs, etc)
to an IDE project file and built a library. Do not use the makefiles
provided, they are not designed for Watcom (apart from SDL):

- zlib
  http://www.zlib.org/ - contains a makefile for OS/2, but is out
  of date and uses EMX, ignore this

- libpng
  http://www.libpng.org/ - contains an EMX/gcc makefile, ignore this

- SDL for OS/2
  ftp://ftp.netlabs.org/pub/sdl/sdl-1.2.7-src-20051222.zip used for
  0.4.7

If you do not wish to build the libraries yourself, pre-built versions
can be downloaded from the Files section at
http://sourceforge.net/projects/openttd/ - see "os2-useful-v1.1.zip".

A Note About Subversion Revision Numbers
----------------------------------------

The project file uses a bit of a hack to find out the SVN revision number and
create an appropriate rev.c file. You'll need the SVN tools in your path
(specifically, "svnversion"). If "svnversion" can't be found, a generic rev.c
with the revision set to "norev000" will be created. To specifically force a
version number, set the environment variable "RELEASE" to the number (eg, "0.3.6")
-before- starting the Open Watcom IDE (which must be launched from the same shell
session). Also, beware, as you WILL cause incompatibilities if you try to
play a multiplayer game with a different version.

Compiling
---------

To compile, open the os/os2/openttd.wpj file in the IDE and first build
the strgen.exe target. This will build the .lng file generator, and will
also attempt to build all the language files (plus the table\strings.h
file which is required for openttd.exe to be built). Once strgen.exe and
the language files are built successfully, you can build the openttd.exe
target.

Contact Information
-------------------

If you have any questions regarding OS/2 issues, please contact me
(owen@owenrudge.net) and I'll try to help you out. For general OpenTTD
issues, see the Contacting section of readme.txt.

- Owen Rudge