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http://www.computer-engineering.org/index.php?title=Main_Page
http://www.computer-engineering.org/index.php?title=PS/2_Mouse/Keyboard_Protocol
http://www.computer-engineering.org/index.php?title=PS/2_Keyboard_Interface
http://www.gaw.ru/html.cgi/txt/app/micros/avr/AVR313.htm