... Got it. I installed the latest PCMCIA (3.1.10) on my Satelite 4030 CDT. The OS is Caldera Open Linux 2.3 (free version from magazine CHIP).
I tried a lot with BIOS defaults (Mode Automatic), but that didn't work. I had to switch to 'Cardbus/16'. After that the Card came up and works now. Here my addition to pcmcia/config:
card "COMPU-SHACK FASTline CardBus 10/100 MBit Fast-Ethernet" manfid 0x0149,0xc2ab bind "tulip_cb"
Thank you very much for your commitment and the help getting our hardware running with LINUX.
Maybe I would had my success event before using the PCMCIA Package of my distribution, if I had switched to the right Bridge mode.