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33-3 The flow of data between disk media and memory is controlled by the CPU.
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changes you have made) to unused space on the disk; the old data (as it was before you opened the file) stays in its old location. This is a safeguard, in case you decide to undo the changes you made. All the data passing between the disks and the memory, and between the memory and the CPU, is in machine language. This consists of binary digits (bits) 0 and 1. But the data passing between you and the CPU is in plain English (or whatever other language you prefer), or in some high-level programming language, having been translated by the machine into a form you can understand.
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The maximum number of bytes of data that can be stored in a computer s memory is known as the memory capacity. The main factor that determines memory capacity is the number of transistors that can be fabricated onto a single memory IC, or
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The display 631 chip. Other factors, such as microprocessor speed, have a practical effect on the usable memory capacity. A gigantic memory will not be of much use if the microprocessor is slow. Nor will a fast microprocessor be of practical value if the memory capacity is too small for applications that demand high speed. The amount of memory you need depends on the applications you intend to run on your computer. Most software packages will tell you how much memory you need. They ll often quote two specifications: a minimum memory requirement and a figure for optimum performance (approximately twice the minimum requirement). If possible, you should equip your computer with enough memory for optimum performance. This year s optimum machine is next year s minimal one when it comes to popular software. If your computer lacks the memory to run a given application, you can usually add more. But this can only be done up to a certain point. Eventually, your microprocessor will no longer be able to run contemporary software at reasonable speed, no matter how much memory you have. When buying a new computer, it s not a bad idea to err on the side of too much memory, rather than risk running short. How much memory do you think your machine will require to run two or three of your favorite applications at the same time Double or triple it, and you will come close to the amount you are likely to need for the next two or three years, until you are overcome by the urge to buy a new computer again. And you will get the urge. Computers can be downright seductive, especially to people who have gotten this far in this book.
Memory volatility
In most computers, the memory is volatile. This means that it requires a source of power to be maintained. If you switch the computer off, or if there s a power failure, you ll lose all the data in the memory. This problem can be avoided if the memory chips are supplied with power continuously. Some machines have rechargeable memory backup batteries that keep memory data intact for short periods if there is a power failure. In contrast to memory, the data on magnetic disks, or on optical media, will stay put when the power is removed. When you re working on a file, it is wise to store the file every few minutes on the hard drive and/or diskette. That way, in the rare event a power failure does occur, you won t lose much work.
The display
The visual interface between you and your computer is known as the display. In desktop computers, an external display is often called a monitor. A cathode-raytube (CRT) monitor resembles a television set without the tuning or volume controls. A liquid-crystal-display (LCD) is lightweight and thin. This type of display is used in notebook and portable computers. It has become increasingly popular for desktop computers because the technology has improved and has become somewhat less expensive.
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