are slumbering in valhalla, just typing `dosbox demo.exe` should do the trick.
-SDL backend
------------
-Run make to build (assuming make on your system is GNU make).
+Building and running with the SDL backend
+-----------------------------------------
+Run make to build (assuming make on your system is GNU make), or use the visual
+studio 2013 project on Windows.
The SDL backend will scale the framebuffer up, by the factor specified in the
`FBSCALE` environment variable. So run the demo as: `FBSCALE=3 ./demo` for
a 3x scale factor, or just export the `FBSCALE` env var in the shell you are
going to use for running the demo. The default scale factor is 2x.
+
+Datafiles
+---------
+The demo datafiles are in their own subversion repo. To checkout the data files
+run the following in the demo root directory:
+
+ svn co svn://mutantstargoat.com/datadirs/dosdemo data