A wide variety of io devices are now available for a

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Unformatted text preview: vices (e) Drive interface standards (f) Digital Versatile Disk (DVD) (c) Optical disk (d) Magneto-optical disk 149. Write the full form of the following abbreviations: (a) DAT (b) IRG (c) IBG (d) BOT marker (e) EOT marker (f) DDS format (g) QIC standard (h) FAT (i) DSDD diskette (j) DSHD diskette (k) CD-ROM (1) WORM disk (m) CD-R drive (n) IDE interface (o) ESDI (P) IPI-3 (q) SCSI (r) DVD (s) DVD-ROM (t) DVD-RAM (u) DVD-R (v) DVD-RW (w) RAID (x) VTOC Chapter 9 Input-Output Devices We have already seen in Chapter 2 that data and instructions must enter the computer system before any computation can be performed and the results of computation must be supplied to the outside world to allow the users to take decisions and necessary actions. Thus, a computer system can be useful only when it is able to communicate with its external environment (its users). As shown in Figure 9.1, the input-output devices (abbreviated I/O devices) provide the means of communication between the computer and the outer world. They are also known as peripheral devices because they surround the CPU and the memory of a computer system. Input devices are used to enter data from the outside world into primary storage and output devices supply the results of processing from the primary storage to the users. A wide variety of I/O devices are now available. For a particular application, one type may be more desirable than another. There are some devices, which are used for both the input and the output functions. The goal of this chapter is to familiarize the readers with the various types of I/O devices available for computer systems. It is important to note that even the fastest of the I/O devices is very slow when compared to the speed of primary storage and CPU. The main reason for this is that the speed of I/O devices in most cases depends upon mechanical movement and the potential for improvement of such devices is limited. It has been difficult to produce I/O devices that can match the processor and storage speeds, and there is a constant demand for faster and fa...
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This document was uploaded on 04/07/2014.

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