RCS is available in the Simtel archives.   Try:

http://oak.oakland.edu/simtel.net/ <http://oak.oakland.edu/simtel.net/>

Search the DOS archive for RCS5.  There will be a couple of zip files.
One will probably contain the manuals and the executables and the other
the source files.

> << Another option is the RCS/CVS combination.  And the best part is
that
>  they are free.
>   >>
> Where??
>
> Mark A. Corio
> Rochester MicroSystems, Inc.