I got a Keyspan USB/Firewire pci card for my Power Macintosh G3 Beige, Rev. A with OS 8.6, from Pagecomputers, and read its requirements on the back of package. It says that it is compatible for Mac with OS 8.6 or higher and Rev. B ONLY which it did not mention on website.
I called Keyspan and learned that it is a typo error on the package, and it is compatible for Mac 9500 or later. I am not too sure yet..
....so I am asking any of you who has Power Macintosh G3, Rev. A and Keyspan USB/Firewire pci card installed. I would appreciate to hear from you!