--- /dev/null
+--- ttycom.h Mon Jun 17 08:08:09 1996
++++ ttycom.h.new Fri Apr 9 08:22:06 1999
+@@ -133,9 +133,13 @@
+ #define TIOCDSIMICROCODE _IO('t', 85) /* download microcode to
+ * DSI Softmodem */
+
++#define TIOCRCVFRAME _IOW('t', 69, struct mbuf *) /* data frame received */
++#define TIOCXMTFRAME _IOW('t', 68, struct mbuf *) /* data frame transmit */
++
+ #define TTYDISC 0 /* termios tty line discipline */
+ #define TABLDISC 3 /* tablet discipline */
+ #define SLIPDISC 4 /* serial IP discipline */
+ #define PPPDISC 5 /* PPP discipline */
++#define HDLCDISC 6 /* HDLC discipline */
+
+ #endif /* !_SYS_TTYCOM_H_ */