diff -dPNur xterm-243/menu.c xterm-243-sm/menu.c
--- xterm-243/menu.c	2009-03-28 18:27:57.000000000 +0100
+++ xterm-243-sm/menu.c	2009-06-14 05:54:26.000000000 +0200
@@ -186,6 +186,10 @@
 static void do_font_loadable   PROTO_XT_CALLBACK_ARGS;
 #endif
 
+#if OPT_WIDE_CHARS
+static void do_font_multibyte  PROTO_XT_CALLBACK_ARGS;
+#endif
+
 #if OPT_HP_FUNC_KEYS
 static void do_hp_fkeys        PROTO_XT_CALLBACK_ARGS;
 #endif
@@ -245,6 +249,15 @@
 static void do_font_utf8_title PROTO_XT_CALLBACK_ARGS;
 #endif
 
+static void
+UpdateMenuItem(
+#if OPT_TRACE
+		  const char *func,
+#endif
+		  MenuEntry * menu,
+		  int which,
+		  Bool val);
+
 /*
  * The order of entries MUST match the values given in menu.h
  */
@@ -365,6 +378,7 @@
     { "render-font",	do_font_renderfont,NULL },
 #endif
 #if OPT_WIDE_CHARS
+    { "font-multibyte", do_font_multibyte, NULL },
     { "utf8-mode",	do_font_utf8_mode,NULL },
     { "utf8-title",	do_font_utf8_title,NULL },
 #endif
@@ -697,6 +711,14 @@
 		}
 	    }
 #endif
+#if OPT_WIDE_CHARS
+	    if ((term->screen.utf8_mode>255)||(!term->screen.wide_chars)) {
+		SetItemSensitivity(fontMenuEntries[fontMenu_font_multibyte].widget,
+				False);
+	    } else {
+		update_font_multibyte();
+	    }
+#endif
 	}
 	break;
 
@@ -1560,6 +1582,23 @@
 }
 #endif
 
+#if OPT_WIDE_CHARS
+static void
+do_font_multibyte(Widget gw GCC_UNUSED,
+		 XtPointer closure GCC_UNUSED,
+		 XtPointer data GCC_UNUSED)
+{
+    term->screen.font_multibyte = !term->screen.font_multibyte;
+    if (term->screen.font_multibyte) {
+	term->screen.utf8_mode=1;    
+    } else {
+	term->screen.utf8_mode=0;    
+    }
+    update_font_multibyte();
+    Redraw();
+}
+#endif
+
 /*
  * tek menu
  */
@@ -2221,6 +2260,18 @@
 }
 #endif
 
+#if OPT_WIDE_CHARS
+void
+HandleFontMultibyte(Widget w,
+		     XEvent * event GCC_UNUSED,
+		     String * params,
+		     Cardinal * param_count)
+{
+    handle_toggle(do_font_multibyte, (int) term->screen.font_multibyte,
+		  params, *param_count, w, (XtPointer) 0, (XtPointer) 0);
+}
+#endif
+
 #if OPT_BOX_CHARS
 void
 HandleFontBoxChars(Widget w,
diff -dPNur xterm-243/menu.h xterm-243-sm/menu.h
--- xterm-243/menu.h	2009-02-13 20:55:26.000000000 +0100
+++ xterm-243-sm/menu.h	2009-06-14 05:57:56.000000000 +0200
@@ -90,6 +90,7 @@
 extern void HandleFontBoxChars     PROTO_XT_ACTIONS_ARGS;
 extern void HandleFontDoublesize   PROTO_XT_ACTIONS_ARGS;
 extern void HandleFontLoading      PROTO_XT_ACTIONS_ARGS;
+extern void HandleFontMultibyte    PROTO_XT_ACTIONS_ARGS;
 extern void HandleHardReset        PROTO_XT_ACTIONS_ARGS;
 extern void HandleHpFunctionKeys   PROTO_XT_ACTIONS_ARGS;
 extern void HandleJumpscroll       PROTO_XT_ACTIONS_ARGS;
@@ -264,6 +265,9 @@
     fontMenu_font_loadable,
 #endif
 #endif
+#if OPT_WIDE_CHARS
+    fontMenu_font_multibyte,
+#endif
 
 #if OPT_RENDERFONT || OPT_WIDE_CHARS
     fontMenu_line2,
@@ -470,6 +474,15 @@
 #define FS2MI(n) (n)			/* font_size_to_menu_item */
 #define MI2FS(n) (n)			/* menu_item_to_font_size */
 
+#if OPT_WIDE_CHARS
+#define update_font_multibyte() \
+  UpdateMenuItem (fontMenuEntries, \
+		    fontMenu_font_multibyte, \
+		    term->screen.font_multibyte)
+#else
+#define update_font_multibyte() /* nothing */
+#endif 
+
 #if OPT_TEK4014
 extern void set_tekfont_menu_item(int n,int val);
 #else
diff -dPNur xterm-243/ptyx.h xterm-243-sm/ptyx.h
--- xterm-243/ptyx.h	2009-03-24 23:20:06.000000000 +0100
+++ xterm-243-sm/ptyx.h	2009-06-14 05:59:38.000000000 +0200
@@ -1358,6 +1358,7 @@
 	int		unicode_font;	/* font uses unicode encoding	*/
 	int		utf_count;	/* state of utf_char		*/
 	IChar		utf_char;	/* in-progress character	*/
+ 	int		font_multibyte;	/* is UTF mode switched on 	*/
 	int		last_written_col;
 	int		last_written_row;
 	XChar2b		*draw_buf;	/* drawXtermText() data		*/