> So it *is* a powerPC system, but one without a PCI bus, but with an MCA bus.

That gets you a little bit closer.

There's no MCA support in NetBSD right now, although someone has most
of the basic support for the i386 port done, and it's supposed to be
committed before NetBSD 1.5 goes out (I don't know when that will be.)
But you'd still most likely need to write code for various support
chips, and code to deal with booting (I'm assuming it doesn't use Open
Firmware), etc. So it would still be a lot of work.

-- Dan