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- O10
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- O11
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- You will see a big metal box with a
- fan on it. That's the power supply.
- It takes house current (110 volts,
- alternating) and steps it down to
- 5 and 12 volts direct current, to
- supply the computer's needs.
- You will see the disk drives.
- You will also see some large
- printed circuit boards that plug
- into long sockets on an even bigger
- printed circuit board. The big one
- is on the bottom of a standard
- desktop case, and on one side of
- tower and mini-tower cases It is
- called the motherboard. The boards
- that plug into it are called
-
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- expansion cards.
- The motherboard contains the most
- essential parts of a computer, the
- Central Processing Unit, called CPU,
- the RAM and ROM memory, and an
- assortment of other important parts.
- The expansion boards contain special
- circuits for "accessories" such as
- your monitor, disk drives, and
- options you might have such as a
- mouse or modem.
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- O10
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- Let's look at the
- title/457 155 1 4 2
- motherboard
- T3
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- C565 162 1
- T1
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