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Support  documents for the video "Binary Numbers & Computers" 4520 Binary Counter,  Circuit Diagram Video - 555, Timer Circuit 555 Circuit Diagram ScienceOnline Video Channel ALT Codes http://www.alt-codes.net/ Convert Text to Binary http://sticksandstones.kstrom.com/appen.html http://www.roubaixinteractive.com/PlayGround/Binary_Conversion/Binary_To_Text.asp Computer Architecture http://en.wikipedia.org/wiki/Computer_architecture Operating System Wikipedia http://en.wikipedia.org/wiki/Operating_system http://www.dmoz.org/Computers/Software/Operating_Systems/ Operating System Introduction http://computer.howstuffworks.com/operating-system.htm Computer Systems Design http://www.codeproject.com/Articles/16105/A-Practical-Approach-to-Computer-Systems-Design-an