I did solve the problem for the 3C509 NIC.
I learned from other distributions this card should not set to PNP.
I found out that the module was 3C509.
So I logged in as root and opened a TTY2 (press <CTRL-ALT-F2> for that).
I typed:
modprobe 3C509
then I typed:
ifup eth0
Then returned to X-server (press <ALT-F5> for that).
Then I could confige the NIC (Start Apllications - Knoppix - Network/Internet - Network card configuration)

All I have to find out is if there is a module for the SMC-NIC.
Maybe someone can tell me which module I need and if it's there.