Add a sample entry specifying numeric tty settings. People sometimes ask

how to force a local tty line into CLOCAL mode and Xon/Xoff flow control.
This is the preferrable way (over rc.serial).

etc/gettytab

@@ -76,6 +76,26 @@ std.57600|57600-baud:\
 std.115200|115200-baud:\
 	:np:sp#115200:
 
+#
+# Entry specifying explicit device settings.  See termios(4) and
+# /usr/include/termios.h, too.  The entry forces the tty into
+# CLOCAL mode (so no DCD is required), and uses Xon/Xoff flow control.
+#
+# cflags: CLOCAL | HUPCL | CREAD | CS8
+# oflags: OPOST | ONLCR | OXTABS
+# iflags: IXOFF | IXON | ICRNL | IGNPAR
+# lflags: IEXTEN | ICANON | ISIG | ECHOCTL | ECHO | ECHOK | ECHOE | ECHOKE
+#
+# The `0' flags don't have input enabled.  The `1' flags don't echo.
+# (Echoing is done inside getty itself.)
+#
+local.9600|CLOCAL tty @ 9600 Bd:\
+	:c0#0x0000c300:c1#0x0000cb00:c2#0x0000cb00:\
+	:o0#0x00000007:o1#0x00000002:o2#0x00000007:\
+	:i0#0x00000704:i1#0x00000000:i2#0x00000704:\
+	:l0#0x000005cf:l1#0x00000000:l2#0x000005cf:\
+	:sp#9600:
+
 #
 # Dial in rotary tables, speed selection via 'break'
 #