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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0111:  Peripheral Devices

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IX  Summary

We began this chapter with a discussion of the various methods of transferring data from the PC to the peripheral devices. We discussed the most basic form of data transfer, serial communications. You learned about asynchronous and synchronous communications, as well as the difference between half-duplex and full-duplex communications.

We learned about parallel communications. You were shown the three different variants of parallel communications; Standard Parallel Port mode, Enhanced Parallel Port mode, and Enhanced Capabilities Port mode.

You then learned about the most exciting advancements in peripheral interfaces, USB and IEEE 1394. You were shown that these interfaces are not only truly plug and play, but that a single interface can be shared with 127 or 63 devices respectively.

Next, you learned about wireless data communications. You were shown the two most common methods, infrared and radio, and their respective advantages and shortcomings. We discussed the various ports and connectors that are used by each of these data transmission technology.

We discussed the various peripheral devices and how they make use of these interfaces and communications methods. We began with input devices. You learned the difference between switched and capacitive keyboards. You also learned about the differences between mechanical and optical mice.

We then concluded with a discussion of output devices. First, you learned about how modems allow two computers to communicate using a phone line. You then learned about the three types of printers used by PC’s; impact printers, inkjet printers, and laser printers.


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