12 Forgotten Online Games - BBS Door Games - Slideshow from PCMag.com
http://www.pcmag.com/slideshow_viewer/0,1205,l%3D255130%26a%3D255131%26po%3D10,00.asp?p=n
"There was a time when "online game" usually meant a text-based game played over the modem on an amateur-run bulletin board system (BBS). Most of these BBSes supported only one phone line, so players took turns dialing in and playing, but they still competed against each other."