File 3C509B2.EXE is EtherDisk Diskette #2 of 2 for the 3Com's 3C509B-COMBO EtherLink III, 10 Mbps Ethernet Network Interface Card,(ISA). This adapter is in the IBM OBI CTO Portfolio and is assigned IBM P/N 0N0500. EtherDisk Diskette #2 contains the software that was on EtherDisk 5.1, except for Windows 95 and Windows NT. This includes installation for NetWare versions 3.X and 4.X, various DOS based network operating systems, IBM OS/2, and the packet driver.