-three options be changed to use the \fB-m\fR option instead. The
--n option remains, but has no effect. The \fB-adnp\fR options are therefore
-omitted from the usage summary above.
+three options be changed to use the \fB\-m\fR option instead.
+The \fB\-a\fP, \fB\-d\fP, and \fB\-p\fR options are therefore omitted from the usage summary above.
+.PP
+Very old systems, e.g., 3BSD, used a different terminal driver which
+was replaced in 4BSD in the early 1980s.
+To accommodate these older systems, the 4BSD \fB@TSET@\fP provided a
+\fB\-n\fP option to specify that the new terminal driver should be used.
+This implementation does not provide that choice.