One. Generally need to we can see the desktop as well as computer knowledge are made up of: the host computer (the main research part), the output control device (monitor), the input information device (keyboard and mouse) three major products. And the host is the main body of the computer, in the main chassis management has: motherboard, CPU, memory, power supply, graphics card, sound card, network card, hard disk, floppy drive, optical drive and other hardware.

From the basic structure, the computer can be divided into five major parts: calculator, memory, controller, input devices, output devices.

Understanding the computer system

The computer system is divided into two parts: hardware and software. Hardware is equivalent to the human body and software is equivalent to the human soul.

Hardware is usually divided into mainframes and external devices, which are the core components of a computer and are usually placed in the chassis. These external devices include input devices such as keyboards and mice, and output devices such as monitors and printers.

Software can generally be categorized into system design software and application software.

Assembling a computer needs to be carried out to buy what issues basic components

Chassis, the main components of a general-purpose computer are placed here.

monitor, used to see the work process of the computer, otherwise, you do not know what the computer is doing.

Keyboard and mouse, to input useful commands for the computer to work for us.

Motherboard, this is a very important thing, although it looks a bit "ugly", here is one of the important parts that determine the performance of your computer.

Memory, when the computer is working, the computer system will store information and data in our memory, equivalent to human memory.

CPU, also known as the central processing unit, is the core of computer computing and control.

Graphics card, the computer through this thing sent to the monitor.

Sound card. The computer sends sound to the speakers through this device.

hard disk, usually people often say my hard disk has how many G, refers to the capacity of this hard disk, investintech free online pdf to word converter the more G, you can load more things.

floppy drive, that is, insert the floppy disk thing, now the business in general students with 3.5 inches, the old days with 5.25 inches, now need us to buy their own people can not be sold.

CD-ROM, listen to the CD-ROM certainly can not do without this, sometimes you have to install some software on the CD-ROM, so this is very useful.

power supply, mainly used to convert 220V external power supply into a variety of DC power for the use of various parts of the computer.

How to evaluate the goodness of a computer

Of course, the goodness of a computer should be measured in many ways, not just one or a few performance indicators. Usually, the performance indicators for evaluating the quality of a computer are as follows.

1, the type of CPU and clock operating frequency

This is the most important performance indicators of the computer, which determines the most basic performance of the computer.

Previously, we often played 286, 386, 486, 586, 686, etc.. According to the model of the CPU.

Clock frequency is a measure of how fast a computer works for a fixed beat (also known as the main frequency). The higher the clock frequency, the shorter the clock cycle, the less time required to execute instructions, the faster the operation.

2, Memory capacity

The unit of memory is MB, that is, we usually say my memory, such as 32MB, 64MB, 128MB, 256MB and so on. The larger the memory capacity of the computer, the more complex tasks the computer can handle, the faster.

3, the configuration and management of external network devices

High-end computers usually have very good soft monitors, keyboards, mice, speakers and so on.

4, Running speed

The running speed of the computer is mainly determined by the speed of the CPU and memory.

5, Bus type

The more bits in the bus, the better the performance of the machine.

6, Compatibility

Whether it has a wide range of compatibility, including whether it can run all the various applications developed on the computer, and whether it can accept the computer's various expansion cards.