There's always NetBSD, and FreeDOS can get online just fine. Both are currently maintained. http://wiki.freedos.org/wiki/index.php/Networking_FreeDOS_-_Quick_Ne

There's always NetBSD, and FreeDOS can get online just fine. Both are currently maintained. http://wiki.freedos.org/wiki/index.php/Networking_FreeDOS_-_Quick_Networking_HowTo http://wiki.freedos.org/wiki/index.php/Networking_FreeDOS_-_... There are also older Linux distribution images available. OS/2 or one of the two commercial spin-offs would have networking support. Windows 95 will run slowly on a 486 but may require the coprocessor. I don't recall about that. Windows 3.1 or 3.11 with Trumpet Winsock will get online. I have a couple of Portmaster 2e IP to serial servers. When I was in the ISP field before the 56k DSP-based integrated systems, we used to hook modems up to devices like that to provide dial-up service. I can hook up around 40 systems that have RS-232 ports to the Internet that way.