From: utzoo!decvax!cca!dove@mit-dspg@sri-unix Newsgroups: net.unix-wizards Title: bi-directional ttys Article-I.D.: sri-unix.1942 Posted: Mon Jun 28 21:58:40 1982 Received: Tue Jun 29 05:52:21 1982 Date: 17 Jun 1982 09:41:05-EDT Using the 128 bit in the tty minor device number to indicate whether any outgoing programs are pending on a line, and making incoming programs sleep while the line is going out, allows a scheme which does not require ANY mods to either init, getty, uucp, or cu.