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diff --git a/chips/screen_defs.h b/chips/screen_defs.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_defs.h
+ * 	Author: Alessandro Forin, Carnegie Mellon University
+ *	Date:	11/90
+ *
+ *	Definitions for the Generic Screen Driver.
+ */
+
+#include <chips/screen.h>
+#include <chips/screen_switch.h>
+#include <device/device_types.h>
+
+/*
+ * Driver state
+ */
+typedef struct screen_softc {
+	user_info_t		*up;
+	char			**hw_state;	/* semi-opaque */
+
+	struct screen_switch	sw;
+
+	/* should also be a switch */
+	io_return_t		(*kbd_set_status)();
+	int			(*kbd_reset)();
+	int			(*kbd_beep)();
+
+	char			flags;
+	char			mapped;
+	char			blitc_state;
+	char			standout;
+	short			save_row;
+	short			save_col;
+	/*
+	 * Eventually move here all that is Kdep in the user structure,
+	 * to avoid crashing because of a bogus graphic server
+	 */
+	short		frame_scanline_width;	/* in pixels */
+	short		frame_height;		/* in scanlines */
+	short		frame_visible_width;	/* in pixels */
+	short		frame_visible_height;	/* in pixels */
+
+/* This is used by all screens, therefore it is sized maximally */
+#	define MaxCharRows	68	/* 2DA screen & PMAG-AA */
+#	define MaxCharCols	160	/* PMAG-AA */
+#	define MinCharRows	57	/* pmax */
+	unsigned char		ascii_screen[MaxCharRows*MaxCharCols];
+
+} *screen_softc_t;
+
+extern screen_softc_t	screen(/* int unit */);
+
+/*
+ * This global says if we have a graphic console
+ * and where it is and if it is enabled
+ */
+extern short	screen_console;
+#define SCREEN_CONS_ENBL	(0x0100)
+#define	SCREEN_ISA_CONSOLE()	(screen_console & SCREEN_CONS_ENBL)
+#define SCREEN_CONS_UNIT()	(screen_console & 0x00ff)
+
+/*
+ * A graphic screen needs a keyboard and a mouse/tablet
+ */
+#define	SCREEN_LINE_KEYBOARD	0
+#define	SCREEN_LINE_POINTER	1
+#define	SCREEN_LINE_OTHER	(-1)
+
+/* kernel font */
+#define KfontWidth	8
+#define KfontHeight	15
+extern unsigned char kfont_7x14[];
+