I notice that the supported hardware section of the INSTALL document
lists the Intel EtherExpress Pro 10/100B as untested... well, I've got
one in my PC164, and it's more or less working:

fxp0 at pci0 dev 5 function 0: Intel EtherExpress Pro 10+/100B Ethernet
fxp0: interrupting at eb164 irq 2
fxp0: Ethernet address 00:90:27:13:0b:30
inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 0
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto

However, if I send a lot of data from the alpha to another machine on my
LAN (e.g. ftp a file from the alpha, or run "ttcp -t -s"), I get "fxp0:
device timeout" messages on the console. Receiving seems to be fine...
I'm running at 10Mbps, half-duplex.
-- 
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 23 Y++ L+++ W- C++ T++ A+ E+ S++ V++ F- Q+++ P+ B+ PA+ PL++