Description: 3c503
 io=0         (It will complain if you don't supply an "io=0xNNN")
 irq=0        (IRQ software selected by driver using autoIRQ)
 xcvr=0       (Use xcvr=1 to select external transceiver.)
 (Probes ports: 0x300, 0x310, 0x330, 0x350, 0x250, 0x280, 0x2A0, 0x2E0)

