[USR-TC] how to download new netserver code?

Hello, I need newer code of my netserver box. How can i find it? Regards My netserver's info; U.S. Robotics Total Control (tm) NETServer Card V.34 V3.3.3 Build date: Nov 27 1996 Build time: 17:06:59 Network Interface Card: Ethernet (24) Packet Bus Circuit : Standard Licensed for 60 ports.