I'm well aware of it. And as late as 2007, I was forbidden from writing those dialects. Professors wanted everything in Fortran 77.
replyInteresting. Did they explain why?
replyThey knew Fortran 77 and didn't want to learn Fortran 90+. I think they also had compatibility concerns. Unsure if there are any, though.
replyIn over a decade in academia, I found only one person writing Fortran 90 (this was in 2001). He did it because he didn't tell his advisor he was doing it.