🚀 go-pugleaf

I'm trying to use RCS or CVS to keep track of changes made to 386bsd.
My problem is the amount of diskspace wasted. Using NSE under SunOS I
don't have the same problem. All source files of a project are under
NSE control but are mapped into a work area using the translucent
file system. This gives read access to all files associated with that
particular project so that you can do a make or browse through files.
Once you check out a file a writeable copy is created in your work
environment. This means that only during the time a file is checked
out you require additional diskspace. Once you checked a changed file
back in it becomes read only (mapped via the translucent file system),
the space for the copy is freed but you still can do a make on it or 
browse through it without having to check the file out.

The question is - can I achieve the same thing with RCS or CVS.
Otherwise is there a public domain version of the TFS ?

Regards - Tibor Sashegyi (cproto@abel.cs.curtin.edu.au)