The necessary external devices of a personal computer are a monitor and a keyboard; a monitor is a display tool that displays certain electronic files on the screen through a specific transmission device and then reflects them to the human eye; the keyboard is a display tool that displays text information The control information is input into the computer channel.
The operating environment of this article: Windows 7 system, DELL G3 computer
What are the necessary external devices for personal computers?
The necessary external devices for a personal computer (PC) are a monitor and a keyboard.
The display (display) is also often called a monitor. The monitor is an I/O device of the computer, that is, an input and output device. It is a display tool that displays certain electronic files on the screen through a specific transmission device and then reflects them to the human eye.
The computer keyboard is a channel for inputting control information of text information into the computer. It evolved from the keyboard of the English typewriter. When it first appeared on computers, it was a component called a "teletypewriter."
Related introduction:
A personal computer refers to a multi-purpose computer of a size, price and performance suitable for personal use. Personal computers range from desktops and laptops to small laptops and tablets and ultrabooks.
The development of personal computers can be divided into three stages:
The first wave started from about the beginning of personal computers to 1984.
The first people to use personal computers were amateurs. Most of them are engineers who understand computer hardware and can use software. The biggest feature of the beginning of the use of personal computers was the significant increase in productivity. Things that previously needed to be done manually were replaced by personal computers and could be done faster. At this stage, there are few varieties to choose from, and the machines are relatively crude; users need to know a lot about computers to use them; there are many people who need to use machines, but the supply cannot keep up. After IBM launched its personal computer, users responded enthusiastically, which established a solid foundation for the development of personal computers. At this stage, value-added distributors began to appear. They could provide some special applications or specialized hardware (such as communications, high-quality printers, etc.), which were very popular among the public.
The following products laid the foundation for industrial development at this stage:
(1) Apple Personal Computer, which was a product that was very popular among users at that time.
(2) VisiCalc spreadsheet software is characterized by its wide range of uses and ease of use. In just two years, it has sold more than 200,000 sets.
(3) IBM personal computer, which played a decisive role in establishing the development future of personal computers.
The second wave started from approximately June 1984 to 1987.
At this stage, more and more people are using personal computers. Because they are profitable, manufacturers have launched a variety of products of different brands and functions. Suddenly, there were a dazzling variety of personal computers on the market; however, the supply exceeded demand, and users felt confused and at a loss as to what to do. Computer technology at this stage also had no clear direction. Different operating systems and different network designs made it difficult for personal computers to connect to each other and many programs were incompatible. At this time, many large companies also began to reconsider their development strategies for personal computers. Many executives think a personal computer should be able to do more than it can actually do. Personal computers are being tested again in front of users. Due to mass production, manufacturers' profits have declined. At the same time, users have gradually understood that the capabilities of personal computers are actually very limited. Therefore, both manufacturers and users were dissatisfied. At this time, some far-sighted manufacturers began to propose the establishment of an industrial standard for personal computers. This standard makes different models of personal computers compatible, which provides a guarantee for its development and promotion.
In the third wave, new functions and new uses of personal computers emerged:
1. Local area network
allows personal computers to link to each other through the network. The standardization of Ethernet (IEEE 802.3) is a milestone in the computer Internet, allowing personal computers to connect to each other through switches or hubs. Local area network is a very important part in the network construction of major institutions and enterprises. The local area network itself has already expanded into the global Internet.
2. Email
Email was a revolution for communication at that time. Users would find it easy to use and very attractive. These factors will make email more popular.
3. Image processing
Personal computers already have sufficient image processing capabilities. Better peripherals became available - color printers, monitors, etc. Application software with more powerful functions has emerged: electronic publishing applications and multimedia processing software.
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