However, instead of a magnetic read head, a tiny laser beam is used to detect microscopic pits burnt onto a plastic disk coated with reflective material. Nevertheless, for personal purposes and slow typists, voice recognition is rapidly becoming a viable alternative to the keyboard. The advantage of the impact printer is that it can produce more than one simultaneous copy by using carbon or chemically-coated paper. Production costs for a CD-ROM are less than Rl, even for relatively small production volumes. For example, it would be more efficient to scan a page of typed text into an information system rather than retyping it, but if this happens very seldom, and if typing staff are readily available, then the cost of the scanner might not be justified. Computer components like the CPU, motherboard, computer case, RAM and drive are the core of a computer. EPROM (Erasable Programmable Read-Only Memory) is like PROM but, by using special equipment such as an ultra-violet light gun, the memory contents can be erased so that the EPROM can be re-programmed. The head is fixed on an arm and can move across the radius of the disk. The most common type of keyboard used nowadays by many users is the one having a so-called quartz layout. the clock rate). The drive reader units themselves have also dropped in price and are now hardly more than the cost of a diskette drive. It’s important to choose computer components that can work together to satisfy your needs. The terms input and output say if data flow into or out of the computer. This is called the Von Neumann architecture because he engineered this approach to computers in the days when computers were still a dream. the 900 km from Cape Town to Bloemfontein takes 4’/2 hours (ignoring speed limits and traffic jams). All of the important functions and tasks that are being processed within a computer can be displayed within the computer monitor. The CD-ROM is a read-only medium. The car’s radar, Toyota says, works even in rain and snow and is constantly scanning ahead. The list of the computer hardware components and their function? Answer. When scanning text, it is necessary to load additional optical character recognition (OCR) software that converts the scanned raster-image of the text into the equivalent character symbols, so that they can be edited using word processing software. These have rapidly been replaced by a diskette version in a sturdier sleeve, the stiffy disk, that despite its smaller size (3 W’) can hold more data. The main drawback of magnetic tape is that it is not very efficient for accessing data in any way other than strictly sequential order. A RAM chip easily holds hundreds of Megabytes (million characters). In addition, there exist custom-made special-purpose cars. Most secondary storage devices in use today are based on magnetic or optical technologies. In the case of the tape recorder one may have to wind laboriously through the tape until one reaches the song required – this is referred to as the sequential access method. A promising research area involves the use of holographic disk storage whereby data is stored in a three-dimensional manner. Screen size is usually measured in inches diagonally across from corner to corner and varies from as little as 12 or 14 inches for standard PCs, to as much as 40+ inches for large demonstration and video-conferencing screens. if the average instruction takes two billionths of a second (2 nanoseconds) then the CPU can execute 500 million instructions per second (or one divided by 2 billionths). Non-impact printers, on the other hand, have far fewer mechanically moving parts and are therefore much quieter and tend to be more reliable. Special-purpose optical scanners are in use by postal services to read and / interpret hand-written postal codes. In the past, the main type of computer monitors used by the consumers was the Cathode Ray Tube type. A very important aspect related to the modem is called the baud rate. The biggest disadvantage of RAM is that its contents are lost whenever the power is switched off. It carries out the … computer-readable, format. 78 79 80. This is the medium used to store the program instructions as well as the data required for future processing. Ironically, this “QWERTY” keyboard layout was originally designed to slow the operator down, so that the keys of the typewriter would not get stuck against each other. it holds it contents even without external power, so it is also useful as a secondary storage device. Although the 650 megabytes initially seemed almost limitless, many multimedia and video applications now require more storage. The Arithmetic and Logic Unit (ALU) executes the actual instructions. The diskette consists of a flexible, magnetic ti^J surface coated mylar disk inside a thin, non-removable, plastic sleeve. Central Processing Unit (CPU) The CPU is the “brains” of the computer. The computer generates various imaginary objects, which the user can “pick up” and manipulate by means of the glove. This is exactly the inverse of the previous measure; e.g. None of these alternative designs has really caught on. The desk-based computer screen is the most popular output device. It is truly the showcase and culmination of the state-of-the-art in the electronics industry: a tiny silicon-based chip occupying less than 1 square cm contains several millions of transistor elements, measuring less than a thousandth of a millimeter across. All of the previous category, it is technically a lot more.... Programmed, ordinary PROMs can not be stressed enough cost and relatively large capacity makes the CD-ROM suited. 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