Introduction to Input/Output Ports
This chapter covers the primary peripheral input/output ports on a modern PC system. This includes a discussion of both the so-called "legacy" serial and parallel ports that have been standard on PCs since the beginning, as well as a discussion of the more current Universal Serial Bus (USB), which is replacing both serial and parallel ports, and IEEE-1394 (i.Link or FireWire) interfaces. (IEEE stands for the Institute of Electrical and Electronic Engineers.) Although SCSI and IDE are also I/O interfaces, they are mainly used as internal interfaces and are important or complicated enough to warrant their own chapters for more specific and detailed coverage.
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