I found a 17-year-old file still available for download on Adobe’s site (adobe.com)

A cool thing you’ll notice in these PostScript files: seemingly random number sets. These are actually units of measurement specified in points! 612 x 792 points == 8.5 x 11 inches

That's not that old - Apple still has downloads going back to the Apple IIGS, some 21 odd years ago.

http://www.info.apple.com/support/oldersoftwarelist.html

Its kinda weird that this is the coolest thing I've seen all day.

Considering the age of some print shops hardware and software, this doesn't come as a surprise.