In the earliest days of the retrochallenge it was a straight date cutoff, of ten years I believe, however this was changed a few years ago because 1994 seemed retro then, but 1999/2000 doesn't seem so retro now. Weird.

What we did back then as well, either the year I hosted it or the year before, was we had a multiplier for each type of platform you might have used. I believe that PPC/Pentium were 1.0, 040/486 were 1.5, 030/386 were 2.0, and it progressed down the line as such, in an effort to make it such that you were rewarded for using even older technology, but that it was possible to participate with something that was ten years old or older.