Arithmetic

	The dream of creating an automatic (mechanic or electronic) device to perform arithmetic calculation very old and the creation of the first "low cost" CPU (the 4004) started the IT-revolution, which made it possible to study these lines from any computer around the world, connected to the internet. Read about the old dream here: http://en.wikipedia.org/wiki/Mechanical_calculator

	In a CPU will the Arithmetic and Logic calculations performed by the ALU (Arithmetic Logic Unit) Read more about ALU's here: http://en.wikipedia.org/wiki/Arithmetic_logic_unit


	In my search for Adders on the net I found this: OpAr Version 1 Very informative indeed - thanks for sharing