Which interface on the host is the mouse plugged into?

The mouse is plugged into the host's serial port, PS/2 port or USB port. The serial interface is the oldest mouse interface. It is a 9-pin or 25-pin D-type interface. It can be used by connecting the mouse to the serial port of the computer host. The PS/2 interface is a mouse interface launched by IBM in 1987. It is a dedicated interface for mouse and keyboard. It is a 6-pin circular interface. The USB interface is a high-speed universal interface with a very high data transfer rate and supports hot plugging.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The mouse is an external input device for the computer and an indicator for positioning the vertical and horizontal coordinates of the computer display system. It is named after its mouse-like shape (called mouse in Hong Kong and Taiwan). Its standard name should be "mouse", and its English name is "Mouse". The use of the mouse is to make computer operation easier and faster, replacing the cumbersome instructions of the keyboard.

Common mouse interfaces include serial port, PS/2, and USB.

Serial port interface

The serial port is the serial interface, that is, the COM interface. This is the oldest mouse interface, a 9-pin or 25-pin D-type interface, which can be used by connecting the mouse to the serial port of the computer host. Its advantage is that it has the widest range of applications and models. It can be used from ancient computers without PS/2 interfaces and USB interfaces to the latest computers. Its disadvantage is that the data transmission rate of serial communication is too low, and mid-to-high-end mice cannot play their high role. Performance advantages, and does not support hot swapping.

PS/2 interface

The PS/2 interface is a mouse interface launched by IBM in 1987, commonly known as "small mouth". This is a dedicated interface for mouse and keyboard, a 6-pin circular interface. But the mouse only uses 4 pins to transmit data and power, and the remaining 2 pins are empty.

As shown in the two card slots, you can directly insert the keyboard or mouse into the purple or green card slot

Transmission rate of PS/2 interface It is slightly faster than the COM interface and is a standard interface for ATX motherboards. Although the PS/2 interface was once widely used, it does not support hot swapping and cannot allow high-end mice to fully exert their performance. Now it has been basically replaced by the USB interface. In the BTX motherboard specification, this is also an interface that will be eliminated soon.

It should be noted that when connecting a mouse with a PS/2 interface, you cannot plug the keyboard into the PS/2 interface by mistake (of course, you cannot plug a PS/2 keyboard into the mouse PS/2 interface). Generally, for a motherboard that complies with the PC99 specification, the mouse interface is green and the keyboard interface is purple. In addition, it can also be judged from the relative position of the PS/2 interface: the keyboard interface is close to the motherboard PCB, and the mouse interface is above it. interface.

USB interface

USB is the abbreviation of English Universal Serial Bus. The Chinese meaning is "Universal Serial Bus", which is a high-speed universal interface.

This is a new type of mouse interface. Before 2013, many new mouse products adopted USB interface. Compared with the first two interfaces, its advantages are very The high data transfer rate can fully meet the refresh rate and resolution requirements of various mice, enable various mid- to high-end mice to fully exert their performance, and support hot swapping.

USB devices mainly have the following advantages:

1. Can be hot-swapped. That is, when using an external device, the user does not need to turn off and on again, but can directly plug in the USB when the computer is working. [1]

2. Easy to carry. Most USB devices are known for being "small, light and thin", which is very convenient for users to carry large amounts of data with them. Of course, USB hard drive is the first choice. [1]

3. Unified standards. Common ones are hard drives with IDE interfaces, serial mouse and keyboards, and parallel port printers and scanners. But with USB, these application peripherals can all be connected to personal computers using the same standards. Then there are USB hard drives, USB Mouse, USB printer, etc. [1]

4. Can connect multiple devices. USB often has multiple interfaces on personal computers, which can connect several devices at the same time. If you connect a USB HUB with four ports, you can connect it again; four USB devices, and so on, you can connect as many times as you want. , connect all your home devices to a personal computer at the same time without any problems (note: can connect to up to 127 devices).

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