My version of RCS is 5.7. I am not sure if I downloaded it from the Purdue site (
https://www.cs.purdue.edu/homes/trinkle/RCShome/) or if it is the binaries that were included with CS-RCS. (I think on one PC it is the former, and on the other it is the latter.)
I haven't had any version control after CS-RCS stopped working. (Not much coding lately. I have been creating manual backups, i.e. foo v1.4.txt.)
CS-RCS saves files in the standard RCS format. When I set CS-RCS up, I chose a network drive as my repository because it gets backed up regularly. Now, trying RCS commands in a CMD prompt doesn't seem to find network locations. That is why I am looking for the correct syntax for specifying both the work file and RCS file.