LICENSE

  PS2Communication.h - PS2Communication library
  Copyright (c) 2009 Free Software Foundation.  All right reserved.
  Rewritten for interrupt and ported for Spark Core
  by Andreas Rothenwänder (aka ScruffR)
  based on some non-interrupt library from pjrc.com (Paul Stoffregen)

  This library provides the basic PS/2 communication framework for
  sending single byte "commands" and receiving data/responses of a 
  PS/2 device.
  One example for communication between Spark Core and a PS/2 mouse is
  provided along with the library.
  
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA