--- ray/src/rt/driver.h	1990/03/08 10:10:44	1.7
+++ ray/src/rt/driver.h	1993/04/05 15:16:46	2.2
@@ -24,7 +24,8 @@ struct driver {				/* driver functions */
 extern int  stderr_v();			/* error vectors */
 extern int  (*wrnvec)(), (*errvec)(), (*cmdvec)();
 
-extern struct driver  *comm_init();	/* stream interface */
+					/* stream interface */
+extern struct driver  *comm_init(), *slave_init();
 					/* magic numbers for verification */
 #define COM_SENDM		0x6f37
 #define COM_RECVM		0x51da
@@ -42,6 +43,8 @@ extern struct device {			/* interactive device */
 	char  *descrip;				/* description */
 	struct driver  *(*init)();		/* initialize device */
 }  devtable[];				/* supported devices */
+
+extern char  dev_default[];		/* default device name */
 
 #define  MB1		('\n')		/* mouse button 1 */
 #define  MB2		('\r')		/* mouse button 2 */