/ hpcupt1:comp.unix.microport / dave at micropen (David F. Carlson) / 9:05 am Apr 27, 1989 / >If you have a PC/AT style bus, IRQ2 is not even a valid bus signal! I believe that it is the BIOS' responsibility to simulate it. Most UNICES don't run through the BIOS, so that may be the point at which it breaks. Andy