The final two gates that are sometimes added to the list are the XOR and XNOR gates, also known as 'exclusive or' and 'exclusive nor' gates, respectively. If you include these two gates, then the count rises to five. Those are the three basic gates that's one way to count them. You read this table row by row, like this. The NOT gate has one input called A and one output called Q 'Q' is used for the output because if you used 'O,' you would easily confuse it with zero. It takes one bit as input and produces as output its opposite. The simplest possible gate is called an 'inverter,' or a NOT gate.

If you have not done so already, reading How Bits and Bytes Work would be helpful before proceeding. These gates are going to seem a little dry here, and incredibly simple, but we will see some interesting combinations in the following sections that will make them a lot more inspiring. There are three, five or seven simple gates that you need to learn about, depending on how you want to count them you will see why in a moment. In this article,we will first discuss simple logic 'gates,' and then see how to combine them into something useful. The great thing about Boolean logic is that, once you get the hang of things, Boolean logic or at least the parts you need in order to understand the operations of computers is outrageously simple. How can a 'chip' made up of silicon and wires do something that seems like it requires human thought? Boolean logic, originally developed by George Boole in the mid s, allows quite a few unexpected things to be mapped into bits and bytes. Now computers do them with apparent ease. Have you ever wondered how a computer can do something like balance a check book, or play chessor spell-check a document? These are things that, just a few decades ago, only humans could do.

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