
The NOR gate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both the inputs to the gate are LOW (0); if one or both input is HIGH (1), a LOW output (0) results. NOR is the result of the negation of the OR operator. It can also be seen as an AND gate with all ...
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http://en.wikipedia.org/wiki/NOR_gate

Gate whose output is 0 ifany of its inputs is a 1.The truth table for the NOR Gate is:The NOR Gate can be made from NAND Gate:
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https://www.encyclo.co.uk/local/20687
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