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diff --git a/hexed/hexed.s b/hexed/hexed.s
index ca17291..93d5d35 100644
--- a/hexed/hexed.s
+++ b/hexed/hexed.s
@@ -1,9 +1,33 @@
-##################################################
-#                                                #
-# Assemble with gas                              #
-#   --register-prefix-optional --bitwise-or      #
-#                                                #
-##################################################
+###############################################################################
+#
+# Copyright (c) 2009, Gražvydas Ignotas
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * 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.
+#     * Neither the name of the organization 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 ''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 <copyright holder> 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.
+#
+# Assemble with gas
+#   --register-prefix-optional --bitwise-or
+#
 
 .text
 .globl main
@@ -307,6 +331,12 @@ lmaploop0:
 
 	/* wait for vsync before unmask */
 	move.l 		#GFXCNTL,a3
+0:
+	move.w		(a3),d0
+	and.b		#8,d0
+	nop
+	nop
+	bne		0b
 0:
 	move.w		(a3),d0
 	and.b		#8,d0
@@ -314,7 +344,13 @@ lmaploop0:
 	nop
 	beq		0b
 
-        move.w		#0x2000,sr
+	/* wait a bit to avoid nested vint */
+	move.w		#20,d0
+0:
+	dbra		d0,0b		/* 10 cycles to go back */
+
+	/* enable vint */
+	move.w		#0x2000,sr
 
 ##################################################