The binary version of 4DOS 7.50 was free for downloading previously,
but now the source code for 4DOS has been released as well:

-Rich Steiner >>>---> >>>---> Mableton, GA USA
Mainframe/Unix bit twiddler by day, OS/2+Linux+DOS hobbyist by night.
WARNING: I've seen FIELDATA FORTRAN V and I know how to use it!
The Theorem Theorem: If If, Then Then.