Hi, First of all, I don't ran Linux on an Old World Mac at the moment. But I have some Old World Macs (PM 7500, PM 9500, ANS ....) In my PM7500 I had a USB-Card for a while an I had also trouble to get it to work. (under Mac OS) What I remember, you need an OHCI-Card, UHCI-Cards didn't work for me. I dont't maybe Linux can handle both. Hope the helps greetings from Germany Ronny (excuse my sometimes bad english)