It adds two binary numbers through the use of many many nested logic gates. It's a bad picture because in the picture it's adding 4105 + 0, which gives 4105

If Sub is 1, the adder subtracts the two numbers the first row of boxes are bitwise NOTs that can be turned on and off http://en.wikipedia.org/wiki/Bitwise_NOT#NOT the second row of boxes are four bit adders

(no subject)from:wetzeldate:Oct. 30th, 2006 06:22 am (UTC)permalink

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(no subject)from:zuckussidate:Oct. 30th, 2006 06:24 am (UTC)permalink

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(no subject)from:zuckussidate:Oct. 30th, 2006 06:25 am (UTC)permalink

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(no subject)from:wetzeldate:Oct. 30th, 2006 06:48 am (UTC)permalink

http://en.wikipedia.org/wiki/And_gate

http://en.wikipedia.org/wiki/OR_gate

http://en.wikipedia.org/wiki/Arithmetic_overflow

http://en.wikipedia.org/wiki/Two%27s_complement

If Sub is 1, the adder subtracts the two numbers

the first row of boxes are bitwise NOTs that can be turned on and off

http://en.wikipedia.org/wiki/Bitwise_NOT#NOT

the second row of boxes are four bit adders

This adder is something that could theoretically be part of a computer's CPU

http://en.wikipedia.org/wiki/ALU

http://en.wikipedia.org/wiki/Adder_%28electronics%29#Multiple-bit_adders

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(no subject)from:zuckussidate:Oct. 30th, 2006 06:57 am (UTC)permalink

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