These versions of DDLAB were compiled for DOS 
with Open Watcom C/C++ version 1.9

ddlabm08 behaves mostly as described in Exploring Descrete Dynamics
ddlabm08_dos32.tar.gz will unpack to give
ddlabm08_dos32.exe, dos4gw.exe, and *.fon files. 

ddlabx09 allows bigger networks
ddlabx09_dos32.tar.gz will unpack to give
ddlabx09_dos32.exe, dos4gw.exe and *.fon files. 

dos4gw.exe and *.fon files must be
in the same directory as the ddlab executable.

The DOS versions of DDLab can be run in pure DOS, 
or in the command line window for earlier Windows releases.
For more recent Windows releases it can be run in DosBox
(an MS-DOS emulator).

To run DDLab:
from the directory with the DDLab files, 
enter the name of the executable, or the name preceded by .\
.\ddlabm08_dos32
or 
.\ddlabx09_dos32 

alternatively, first change directory to "ddfiles"
then enter the name of the executable preceded by ..\
This will keep files generated by DDLab in the ddfiles subdirectory.

DDLab will start in low resolution 640x480.

If running in the command line,
to toggle to full screen and back enter Alt+Enter.
In full screen you can change to higher resolution
1024x768 (or medium res 800x600), but change back 
to low before exiting DDLab.

Earlier versions of windows (up to 1998) have an alternative
DOS operating system; the DOS version of DDLab runs better in that.

Note: because DDLab for DOS has a few drawbacks,
Windows users might consider the Cygwin/X version of DDLab. 
Cygwin/X is a Linux environment running in Windows.