[9fans] 100base ether card

[jim mckie jmk@plan9.bell-labs.com]

We have used a mixture of 100BASE-X cards with Brazil using the
following chips:
	3COM			3C595, 3905, 3C905B
	Intel 82557/8	EtherExpress PRO/100B
					Allied Telesyn 2560FX
	Digital 21140	Fast EtherWORKS PCI 10/100 adapter (DE-500-X)
					Accton EN1207-COM
					Adaptec (Cogent) ANA-6910FX
					SMC 9332
I also have, but untried as yet
	3COM			3C572 (EISA)
	Digital 21140	Netgear FA-310TX 10/100 PCI
					Kingston ENET PCI 10/100
The Netgear costs ~$30, the Kingston ~$40.

All of the tried cards work fine.
Third-party cards based on the 21140 sometimes require more tweaking than
they should to get the link established and I'll be working on that in the
near future.

As to drivers, I gave copies of Brazil drivers for these cards to a couple
of people on the mailing list early this year (maybe even last year)
on the understanding that the backported Plan9 drivers would be made available,
but I haven't heard anything back.

--jim