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by flyinghamster 791 days ago
There was a cable-based serial terminal networking system called LocalNet, which was all over the University of Illinois Urbana-Champaign campus circa 1985. The LocalNet modems/concentrators connected terminals and computers throughout the campus. You'd fire up your terminal, hit ENTER for a prompt, then type CALL xxx,yyy (xxx and yyy being hex addresses) to reach a particular host. The host just saw it as just another RS-232 modem.