(1) the basic parts of a computer
Computer on the appearance of it mainly consists of the host and display computer system by arithmetic unit, controller, memory, input devices and output devices of five most arithmetic unit and controller together, also known as the central processor CPU for short; Memory into internal memory and external memory, internal storage memory (RAM) for short, external storage or peripheral storage such as hard disk, CD, mobile disk, etc.; Input device is used to input data to the computer system from the outside world, the only way common input devices are the mouse, keyboard, scanners, etc.; Output device is a computer will process the results displayed to the user, the common output devices are monitors, plotter, acoustics,
(2) the composition of host
Host by the motherboard, memory, CPU, hard disk, cd-rom, data cables and power supply,
(3) host panel button
Boot button (Power), reset button (Rest) the system will crash when press the button
New start,
(4) panel interface
Mainframe computers generally have a USB on the front panel and the sound and microphone interface, BUS interface is also known as plug-and-play interface (don't have to shut down the computer system, in the boot state can be directly inserted), USB devices can use this interface and the computer connected to a common USB device with USB keyboard and USB mouse, USB printer, U disk, mobile hard disk, etc., also can be used to and digital cameras, mobile phones connected to the user pay special attention to is that we call USB plug and play device but class to mobile storage disk is best not to pull out directly, because it is easy to damage the disk lead to loss of data, the correct method is: click on the lower right corner of the desktop icon, and then click the bottom right hand corner the pop-up window, such as a "safe remove USB" and then remove the USB device, the computer host are on the rear panel power supply, POST, serial, parallel, display, network, USB, sound and microphone interface, most of these interfaces are found on the main board, sound card, network card, graphics card can be a motherboard can also be independent and integrated devices, note: different mainboard interface layout is different, but the interface specification and form are in conformity with the international standard,
Serial port: this is a serial communication interface of data transfer mode, so it can only connect the serial device,
Parallel port: this is parallel communication interface of data transfer mode, main and parallel port devices connected, usually can be connected with parallel printer,
COM: the COM has two, a COM interface is the mouse, a COM is a keyboard interface, interface are marked by it,

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refer to the second floor weixin_45815697 response:

Quote: refer to 1st floor Tu_Wen123 response:

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