The first step in understanding a personal computer, or PC, is to get an overall view of the components, or devices, that make up such a system. This can be done in a variety of ways. We can view the devices strictly from a physical point of view. For instance, some devices are internal to the system unit and some are external. While this is useful (and we will do it in a moment), it is equally important to take a functional viewpoint, grouping devices according to their general purpose or function.
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