ok .. in the bios i just enabled (again):
'onboard lan'
'pci 2.1 support'
i also see a setting 'interrupt mode' which i can set to 'pic' or 'apic' (its set to 'apic' right now) i dont know what that does do
when i then go to windows i find :
sis900-based pci fast ethernet adapter
hardware version 145
irq3
memory : 0fc00000-ofc00fff
i/o : 1400-14ff
when i look at the chip on my mainboard then i see :
realteak
rtl8201bl
2508001
2200 taiwan
(i think this is the onboard sis900 ethernet controller..which seems to be a realtek as well

)
the old ethernet card i also put in (in a pci slot) is also a realtek (so i have 2 realtek ethernet controllers in it now (1 onboard, 1 pci))
the chip on the one in the pci slot has :
realtek
rtl8029as
0136691
663c taiwan
(it has knc30bt on top of the green background)
i only need 1 ethernet card ... so either the sis900 (realtek8201) or the realtek8029 ... but so far i am unable to make any of them work
a colleague of me has an older version of this barebone system .. also with a sis900 ethernet card .. and he had no problems at all setting it up .. i used the same cd's of rh7 as he ... when i was on vacation he also tried it and installed the rh8 i have on it right now