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diff --git a/chips/screen_switch.h b/chips/screen_switch.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ *	File: screen_switch.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	10/90
+ *
+ *	Definitions of things that must be tailored to
+ *	specific hardware boards for the Generic Screen Driver.
+ */
+
+#ifndef	SCREEN_SWITCH_H
+#define	SCREEN_SWITCH_H	1
+
+/*
+ *	List of probe routines, scanned at cold-boot time
+ *	to see which, if any, graphic display is available.
+ *	This is done before autoconf, so that printing on
+ *	the console works early on.  The alloc routine is
+ *	called only on the first device that answers.
+ *	Ditto for the setup routine, called later on.
+ */
+struct screen_probe_vector {
+	int		(*probe)();
+	unsigned int	(*alloc)();
+	int		(*setup)();
+};
+
+/*
+ *	Low-level operations on the graphic device, used
+ *	by the otherwise device-independent interface code
+ */
+struct screen_switch {
+	int	(*graphic_open)();	/* when X11 opens */
+	int	(*graphic_close)();	/* .. or closes */
+	int	(*set_status)();	/* dev-specific ops */
+	int	(*get_status)();	/* dev-specific ops */
+	int	(*char_paint)();	/* blitc */
+	int	(*pos_cursor)();	/* cursor positioning */
+	int	(*insert_line)();	/* ..and scroll down */
+	int	(*remove_line)();	/* ..and scroll up */
+	int	(*clear_bitmap)();	/* blank screen */
+	int	(*video_on)();		/* screen saver */
+	int	(*video_off)();
+	int	(*intr_enable)();
+	int	(*map_page)();		/* user-space mapping */
+};
+
+/*
+ *	Each graphic device needs page-aligned memory
+ *	to be mapped in user space later (for events
+ *	and such).  Size and content of this memory
+ *	is unfortunately device-dependent, even if
+ *	it did not need to (puns).
+ */
+extern char  *screen_data;
+
+extern struct screen_probe_vector screen_probe_vector[];
+
+extern int screen_noop(), screen_find();
+
+#endif	SCREEN_SWITCH_H