Very Computer

I don't get my network adaptor installed. My provider (Cable!) uses a
non-static IP number. My adaptor is a 3Com Etherlink III Isa (3C509b-TPO) in
PnP-mode.

Who can help me?

First, you have to disable PnP on the 3Com card because Linux doesn't support it (yet!).  To do this, install the card in an ISA slot and boot with a DOS formatted floppy disk.  Then use the 3c5x9cfg utility on Disk 2 of the drivers disk that came with your network card.  You will have to assign an IRQ and address to the card, but 3Com made it pretty easy with this utility.  If you don't have the Disks for the card, you can down load them from 3Com's website.  You'll also find documentation for the utility there.

From there you can get all the network information you'll ever need at the Linux Documentation Project  (don't forget to use a mirror site near you) site in the Networking HOWTO.  This is an invaluable resource.  
If your provider is using non-static ISP, configure your card for DHCP (Dynamic Host Control Protocol).

If you haven't yet installed Linux, forget the networking HOWTO.  The installations are normally pretty good in setting up the operating system to use the 3C509b cards.  They just work. (my experience is Red Hat, other distributions may vary)

Cable's nice, eh?  I've had it at home for just over 2 years and I'll NEVER go back to a phone line for 'net access!

Allan