Check out this nifty and interesting output from 'dmesg':

ae0 at nubus0: address 00:00:94:20:ce:ac, type MacCon Ethernet, 32KB
memory
ae1 at nubus0: address 00:00:94:04:c4:6b, type MacCon Ethernet, 32KB
memory
ae2 at nubus0: address 00:00:00:00:00:00, type Farallon EtherMac II-C,
32KB memory

I noticed this fascinating MAC address after the card in ae2 stopped
working. Can someone surmise what might have happened to this card such
that it reports a string of zeroes, or is this the hardware sense
routine's way of indicating the card is just dead?

- Amitai