the supported hardware list on the netbsd(or is it the macbsd?) site lists both
840av and 660av as having unsupported onboard ethernet. The link I am thinking of
leads straight from the faq

Sal

Dave Huang wrote:

> On Wed, 29 Mar 2000, jean-michel meyer wrote:
> > I have the opportunity to get a Quadra 660 AV for running NetBSD.
> >
> > It seem reading the site that the onboard Sonic DP83932 ethernet port is
> > not supported.
>
> The onboard ethernet is not a Sonic, it's an AMD MACE. And it has been
> supported by the mc driver since NetBSD 1.3... where did you read that
> it wasn't supported?
>
> > The Q660AV has three nubus port, but just one is avaible.
> >
> > but i need two ethernet ports (one to a hub, one to a cable "modem").
>
> I haven't done it myself, but you should be able to put a NuBus ethernet
> card in it using the NuBus adapter, giving you two ethernet
> ports. Actually, I seem to remember reading on the mailing list that
> someone has done just that :)
> --
> Name: Dave Huang     |   Mammal, mammal / their names are called /
> INet: khym@bga.com   |   they raise a paw / the bat, the cat /
> FurryMUCK: Dahan     |   dolphin and dog / koala bear and hog -- TMBG
> Dahan: Hani G Y+C 24 Y++ L+++ W- C++ T++ A+ E+ S++ V++ F- Q+++ P+ B+ PA+ PL++