Please briefly describe the composition of a complete computer system
Divided into hardware systems and software systems
Hardware systems are divided into: operators, controllers, memory (internal and external memory), input devices (keyboards, mice, plotters, etc.), output devices (monitors, printers, etc.)
Software systems are divided into: system software, application software
Briefly describe the composition of the computer system
Computer system consists of hardware (sub) system and software (sub) system. The former is with the help of electricity, magnetism, light, mechanical and other principles of the organic combination of various physical components, is the entity on which the system works. The latter is a variety of programs and documents, used to command the whole system to work according to the specified requirements.
Computer system for database management of computer hardware and software and network systems. The database system requires large-capacity primary memory to store and run the operating system, database management system programs, applications, and databases, directories, system buffers, etc., while the secondary memory requires large-capacity direct access devices. In addition, the system should have strong network capabilities.
Computer systems are characterized by the ability to perform precise and rapid calculations and judgments, and are versatile, easy to use, and can be networked.
①Calculation: almost all complex calculations can be realized by computers through arithmetic and logical operations.
② judgment: computers have the ability to distinguish between different situations, the choice of different treatment, so it can be used for management, control, confrontation, decision-making, reasoning and other fields.
③Storage: computers can store huge amounts of information.
④Precise: as long as the word length is sufficient, the calculation accuracy is theoretically unlimited.
⑤Fast: the time required for a computer to operate at once has become as small as a nanosecond.
6 General: computers are programmable, and different programs can realize different applications.
7 easy to use: rich high-performance software and intelligent human-machine interface, greatly facilitating the use.
Components of a computer Brief description of the components of a computer
1, the five major components of a computer include: controller (CU), operator (ALU), memory (Memory), input devices (Input) and output devices (Output).
2. CU is mainly for controlling the system, and the function of ALU is to perform mathematical and logical operations; CPU=ALU+CU. in the organs of the human body, it is similar to the human brain. Memory is equivalent to a person’s memory (temporary access), while the hard disk is equivalent to a person’s a notebook (permanent storage).
3. Memory is divided into RAM and external memory. The advantage of memory is that the speed of access is faster compared to the hard disk; the disadvantage is that the power failure data are easily lost and can not be saved. The advantage of the external hard disk is that the power failure data will not be lost, can be saved permanently; disadvantage is that the access speed is slower compared with the memory.
4, input devices: keyboard, mouse, touch screen. Output devices: monitor, audio, printer. Input devices and output devices are collectively referred to as I/O.
A brief description of the composition of a computer system
The hardware structure of a computer system consists of five main parts, namely, the controller, the operator, the internal memory, the input device and the output device.
The computer, commonly known as a computer, is a modern electronic calculator used for high-speed calculations, which can perform numerical calculations and logical calculations, and also has a storage memory function. Is able to run in accordance with the program, automatic, high-speed processing of large amounts of data of modern intelligent electronic equipment. Composed of hardware systems and software systems, without installing any software computer called bare metal. Can be divided into supercomputers, industrial control computers, network computers, personal computers, embedded computers five categories, the more advanced computers have biological computers, photonic computers, quantum computers and so on.
The inventor of the computer, John von Neumann. The computer is one of the most advanced scientific and technological inventions of the 20th century, which has had an extremely important impact on human production and social activities, and has developed rapidly with a strong vitality. Its field of application from the initial military research applications to all areas of society, has formed a huge scale of the computer industry, led to the global scope of technological progress, which triggered a profound social change, the computer has been all over the general schools, enterprises and institutions, into the common people’s homes, become an essential tool in the information society.
How is a computer composed?
The complete computer system is divided into two major parts: the hardware system, including operators, controllers, memory, input devices, output devices, and the software system, including system software (computer operating system) and application software. The complete computer system is divided into hardware system and software system two major parts, the hardware system includes operators, controllers, memory, input devices, output devices five major parts; software system includes system software (computer operating system) and application software.
Computer hardware system
Computer hardware is an important part of the computer, which contains five important components: operators, controllers, memory, input devices, output devices.
The main function of the operator in computer hardware is to calculate and process data and information. Operators include the following parts: general-purpose registers, status registers, accumulators, and key arithmetic logic units. Operators can perform arithmetic calculations (addition, subtraction, multiplication, and division) and logical operations (with or without).
The controller and the operator together form the central processing unit (CPU). The controller can be regarded as the brain and command center of the computer, which can make the various components of the computer complete the instructions in an orderly manner by integrating and analyzing the relevant data and information.
As the name suggests, memory is the computer’s memory system, is a computer system in the notepad. And the notepad is different, the memory can not only save information, but also can accept different information within the computer system and read the saved information. Memory consists of primary and secondary memory, the primary memory is commonly known as memory and is divided into two parts, RAM and ROM. The secondary memory is the external memory, but the computer must first exchange information between the internal and external memory before it can process the information in the external memory.
4, input devices
Input devices and output devices are the key equipment for human-computer interaction. The emergence of the mouse, keyboard and other input devices to the computer has brought about sweeping changes. There are two main types of existing mice: photoelectric mice and mechanical mice. Through the mouse, we can easily locate the coordinates on the computer screen, and can manipulate the graphics and software processing well, providing the greatest convenience for human beings. Keyboard is also a very important class of input devices, most of the computer commands are entered through the keyboard to carry out.
Write in detail about the components of an entire computer system.
Composition of a computer system
Composed of two parts, hardware and software, which together determine the computer’s ability to work
One Computer Hardware
Hardware of a computer:Operators, controllers, memories, input devices, output devices
Mainframe computer: operators, controllers, internal memory
Peripherals. Components other than the host computer.
(1) Central Processing Unit (CPU)
CPU: controller and operator composition, is the core of the computer, usually the model of the CPU determines the model of the machine and the basic performance.
The main frequency of the computer: the frequency of the central processing unit clock. The main frequency is usually megahertz (MHZ) as a unit, is an important indicator of the computer’s computing speed.
Commonly used CPU models are Pentium (Pentium), PentiumII, PentiumIII and so on.
Memory: referred to as memory, mainly used to store the computer’s current work is running programs, data, etc., equivalent to the computer’s internal storage center.
Classification: by function, can be divided into random memory (RAM) and read-only memory (ROM).
Random memory (RAM): mainly used to store the computer at any time in the processing of data, these data are not only allowed to be read, but also allowed to be modified. After restarting the computer, the information in the RAM will be completely lost. We usually refer to the memory capacity of RAM.
Read-Only Memory (ROM): It stores information generally determined by the computer manufacturer, usually the boot program when the computer starts, the system’s basic input and output systems and other important information, this information can only be read, can not be modified. After restarting the computer, the information in the ROM will not be lost.
The basic unit of memory storage capacity: byte (Byte, B)
Commonly used units: kilobytes (KB), megabytes (MB), gigabytes (GB).
2. Input devices and output devices
Input devices:Transmit a variety of information (such as text, numbers, sound, images, etc.) to the computer.
Output devices: display the contents of the input to the computer and the results of computer processing.
Commonly used input devices: keyboards, mice, scanners, light pens, voice input devices.
Common output devices: monitors, printers.
3. External memory
Function: mainly used to store the information that needs to be saved.
Commonly used external memory: floppy disk, hard disk, CD-ROM
Soft disk: commonly used capacity of 1.44M
Hard disk: referred to as hard disk, storage capacity is larger, generally several hundred megabytes to and gigabytes, storage speed faster than the floppy disk.
Optical disks: read-only and read-write CD-ROMs, commonly read-only CD-ROMs. The capacity of the CD-ROM is very large, usually about 600MB.
Computer software: computer programs, data for the program and the collection of related information.
Category: system software and application software.
System software: directly control and coordinate the operation of the computer and its external equipment. Commonly used DOS, WINDOWS.
Application software: directly used to complete a specific application without user programming software.
Computer software is the creative product of the software designer’s mental labor, copyright, protected by law.
Computer system organization chart.
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