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I/O devices are those that provide an interface between the user and the computer and include mice, keyboards, monitors, printers, scanners, modems, speakers, and any other devices that take data in or spit data out of the computer.
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Interconnecting the components of the computer is a cable known as a parallel bus. It is called parallel because the bits that make up one or more eight-bit bytes travel down the bus beside each other on individual conductors, rather than one after the next as occurs in a serial cable on a single conductor. Both are shown schematically in Figure 5-7. The advantage of a parallel bus is speed: By pumping multiple bits into a device in the computer simultaneously, the device such as a CPU can process them faster. Obviously, the more leads there are in the bus, the more bits can be transported. It should come as no surprise, then, that another differentiator of computers today is the width of the bus. A 32-bit bus is four times faster than an eight-bit bus; as long as the internal device to which the bus is transporting data has as many input/output leads as the bus, it can handle the higher volume of traffic. The parallel
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Figure 5-7 Parallel and serial buses
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bus does not have to be a flexible gray cable; for those devices that are physically attached to the main printed circuit board (often called the motherboard ), the parallel bus is extended as wire leads that are etched into the surface of the motherboard. Devices, such as I/O cards, attach to the board via edge connectors. Enough about computer internals. A brief word about computer history and evolution is now in order. The work performed by Von Neumann and his contemporaries led to the development of the modern mainframe computer (Figure 5-8) in the 1960s and its many succeeding machine design generations. Targeted primarily at corporate applications, the mainframe continues to provide computing services required by most corporations: access to enormous databases, security, and support for hundreds of simultaneous users. These systems host enormous disk pools (Figure 5-9) and tape libraries (Figure 5-10), and are housed in selfcontained windowless computer centers. Their components are interconnected by large cables that require they be installed on raised floor (Figure 5-11). They produce so much heat that they are fed enormous amounts of chilled air and water and require constant attention and monitoring. It makes sense: These are very powerful creatures. Over time, computer technology advanced, and soon a new need arose. Mainframes were fine for the computing requirements of large, homogeneous user communities, but as the technology became cheaper and more ubiquitous, the applications for which computers could be used became more diverse. Soon a need arose for smaller machines that could be used in more specialized departmental applications, and in the 1970s, thanks to companies like Xerox, Digital Equipment Corporation (DEC), and
Figure 5-8 Mainframe computers in a clean room environment No people work on this floor; the machines are controlled from another area.
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Figure 5-9 Mainframe disk pool, sometimes called a Direct Access Storage Device (DASD) Farm
Figure 5-10 Tape library Many data centers now use cartridges that look like the old eighttrack tapes and hold significantly more data than the reels shown here.
Data General, the minicomputer was born (Figure 5-12). The minicomputer made it possible for individual departments in a corporation, or even small corporations, to take charge of their own computer destinies and not be shackled to the centralized data centers of yore. It carried with it a price, of course: Not only did these companies or organizations lose their dependency on the data center, they also lost the centralized support that came with it. So there was a downside to this evolution. The real evolution, of course, came with the birth of the personal computer. Thanks to Bill Gates and his concept of a simple operating system (DOS) and to Steve Jobs with his vision of computing for the masses, truly ubiquitous computing became a reality. From the perspective of the individual user, this evolution was unparalleled. The revolution began in
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