Very rare unique 3Com Etherlink III ISA 3C509B-C 03-0021 tested
3Com EtherLink. III ISA Combo. 15 pin D-Sub (DB-15), BNC, RJ-45. Slot Required. Drivers & Utilities. Microsoft DOS, Microsoft Windows 3. x/95/98, Microsoft Windows NT 3.51 or later, Novell NetWare.