I've got a 1990 volvo 760 turbo station wagon. yeah laugh all you want. but in the back is a small black box, hidden in a compartment beside the spare tire with a just a simple ethernet jack in it. The best i can figure is its used for diagnostic stuff. any serial cable will plug into it, as well as my computer, so i was wondering if there is any software available that will allow me to connect my car with my computer. I've looked at OBD-II, but i'm not sure that will work. Any help at all would be appreciated.