+.SH DIAGNOSTICS
+\fIttyxx\fR\|\fB: No such device or address\fR.
+\fIttyxx\fR\|\fB: No such file or address\fR.
+A terminal which is turned
+on in the \fIttys\fR file cannot be opened, likely because the requisite
+lines are either not configured into the system, the associated device
+was not attached during boot-time system configuration,
+or the special file in /dev does not exist.