Fixed video, kbd and buzzer

cpu/copyleft.txt

@@ -0,0 +1,13 @@
+//----------------------------------------------------------------------------
+//  A-Z80 CPU Copyright (C) 2014,2017  Goran Devic, www.baltazarstudios.com
+//
+//  This program is free software; you can redistribute it and/or modify it
+//  under the terms of the GNU General Public License as published by the Free
+//  Software Foundation; either version 2 of the License, or (at your option)
+//  any later version.
+//
+//  This program is distributed in the hope that it will be useful, but WITHOUT
+//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+//  more details.
+//----------------------------------------------------------------------------