MGETTY
The Source for mgetty is at
http://www.leo.org/~doering/mgetty/
.
These are a number of pages to getting Mgetty running, including with multiple input lines.
http://www.buoy.com/isp/mgetty.html
http://members.bellatlantic.net/~mrdennis/mgetty.html
http://theory.uwinnipeg.ca/localfiles/infofiles/mgetty.html
http://www.buoy.com/isp/portslave.html
http://portslave.linuxrouter.org/
http://portslave.mnic.net/