I was trying to install several 10/100 cards into our existing network (which is stocked with older, but reliable, 3com 10baseT cards). I have 3 NICs with the RTL8139 (a&b) chips and a couple with linksys lne100tx chips. I tried installing them into 3 computers. Two have super socket7 with K6-2 processors, one has an old Asus mobo with p233mmx. Although each computer recognized and installed the cards (all running win98), none would recognize the network (simple peer-to-peer). I had to pop the good cards out and go back to the 3com 10meg cards.... any thoughts??