• AND, OR and NOT gates are electrical devices which implement the corresponding Boolean operations.

• Today, gates are built from a few transistors.

• We represent the three types of gates symbolically:
    

• Gates are a useful abstractions. Once we are convinced that gates can be built using transistors, we can design higher-level constructs using gates, without thinking about transistors anymore.

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Last Updated 01/05/2000
© L.Heath, 2000