I first encountered "Puff the Fractal Dragon" in the University of Waterloo in 1985. "DCS" was our "Department of Computer Services".
I found a Usenet post from October 1985 on net.jokes claiming it came from the University of Waterloo MathSoc news letter "MathNEWS" volume 39 #1, and was written by "Weird Jim Jordankovic".