ECHO              257 src/simh/linehistory.c   raw.c_lflag &= ~( ECHO | ICANON | IEXTEN | ISIG );
ECHO             2131 src/simh/sim_console.c runtty.sg_flags     = cmdtty.sg_flags & ~(ECHO|CRMOD) | CBREAK;
ECHO             2226 src/simh/sim_console.c runtty.c_lflag        = runtty.c_lflag & ~(ECHO | ICANON);     /* no echo or edit */