In general, an expansion bus is a set of circuitry pathways on the motherboard directly connecting the various types of expansion slots (to be discussed later in this chapter) to the CPU, chipset and the rest of the system. There are numerous types of expansion buses but you will only encounter a few in modern computer systems. Having said that, it is likely that you as an A+ technician, you will encounter several legacy systems that use old bus types. You will need to be familiar with the various bus types not only for the A+ exam but in order to be prepared to maintain older computer systems. Keep in mind that prior to the expansion bus being incorporated onto the motherboard, the only way to upgrade a computer or to use additional devices was to get another motherboard or another computer with those devices already built in.
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