I was thinking of the emminent release of Frontier 5, and I got all teary-eyed as a wave of nostalgia swept over me (well, sort of like that).
Here are pictures of some of my original Frontier floppy disks. There's a serial number. I'm a registered user!
Here's Version 1.0!
And check out that copyright date:
A Frontier 2->3 Upgrade disk and the PPC Version:
I even have Runtime!