I really think the pivotal years were 1992-1993. That's when you had ID's Wolfenstein 3d and then Doom. I was in college and all my Comp-Sci buddies and I were just gaga over these new "3d" games. That's what caused my attention to shift away from the Amiga and into the PC. A few years later you had quake with the next generate of real 3D video boards and things really took off. Anybody remember the first time they saw GLQuake running on one of those new "fancy" verite boards? It was a thing of beauty, I say.