File 3C900B.EXE and 3C900B2.EXE is EtherDisk XL, for the 3Com's 3C900B-COMBO EtherLink XL, 3C900B-COMBO PCI, Fast EtherLink XL/EtherLink XL Bus Master NIC Family, 10 Mbps Ethernet Network Interface Card. This adapter is in the IBM OBI CTO Portfolio and is assigned IBM P/N 0N0503 with IBM FRU P/N 0N0505. The EtherDisk XL diskettes support 3Com's family of bus mastering PCI network NICs with a common driver set. Products included in this family are the Fast EtherLink XL 10/100BASE-TX, EtherLink XL PCI TPO/ COMBO/TPC, Fast EtherLink XL 100-Base FX, EtherLink XL 10-Base FL NICs.