My first employer out of university kept their code in Visual Source Safe, Microsoft's first attempt at a VCS. It was really, really bad. My second employer u

My first employer out of university kept their code in Visual Source Safe, Microsoft's first attempt at a VCS. It was really, really bad. My second employer used CVS. Tags were fun back then -- each file was versioned separately so committing multiple files while a tag was in progress might result in only some of your changes making it into the tag. My big innovation there was to add a validation step to our build machine to ensure that the tag matched the state of the branch once the tag had finished, and add the tag to the build version number. Presto: we can actually see which code was built into that day's full build :).