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diff --git a/usr.bin/tn3270/distribution/sys_dos/video.h b/usr.bin/tn3270/distribution/sys_dos/video.h
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+++ b/usr.bin/tn3270/distribution/sys_dos/video.h
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+/*-
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)video.h	8.1 (Berkeley) 6/6/93
+ */
+
+/*
+ * This is a header file describing the interface via int 10H to the
+ * video subsystem.
+ */
+
+#define	BIOS_VIDEO	0x10
+
+typedef enum {
+    SetMode = 0,
+    SetCursorType,
+    SetCursorPosition,
+    ReadCursorPosition,
+    ReadLightPenPosition,
+    SelectActiveDisplayPage,
+    ScrollActivePageUp,
+    ScrollActivePageDown,
+    ReadAttribute_Character,
+    WriteAttribute_Character,
+    WriteCharacterOnly,
+    SetColorPalette,
+    WriteDot,
+    ReadDot,
+    WriteTeletypeToActivePage,
+    CurrentVideoState,
+    Reserved16,
+    Reserved17,
+    Reserved18,
+    WriteString
+} VideoOperationsType;
+
+typedef enum {
+    bw_40x25 = 0,
+    color_40x25,
+    bw_80x25,
+    color_80x25,
+    color_320x200,
+    bw_320x200,
+    bw_640x200,
+    internal_bw_80x25
+} VideoModeType;