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Most people do not understand the knowledge points of this article "what are the common external interfaces of xp computers?", so the editor summarizes the following contents, detailed contents, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "what are the common external interfaces of xp computers?"

1. Serial (COM) / parallel (LPT)

COM and LPT are veterans of computer interfaces, which were developed by the American Electronic Industry Association in 1970 and have since undergone two improvements. The earliest serial port was a 25-pin plug, not the 9-pin we often see today. Later, it was improved from IBM to 9-core D-port, and the highest speed was 10Mbps. The LPT, like the earlier COM port, is also a 25pin connector, which is used to connect the printer with a maximum speed of 1.5mbps. Early used to connect mice, modems, printers and other devices. But COM can really be regarded as the veteran of computer interface. Even for a few days, we can still see devices with various COM interfaces, although they have been gradually replaced by USB. But be careful not to confuse it with the VGA interface.

2 、 PS/2

The name of the PS/2 interface comes from the personal computer introduced by IBM in 1987. It was seen in a variety of compatible computers in the early days, and although the PS/2 interface can now be seen, it has been basically replaced by USB. PS/2 interface is used to connect mouse and keyboard, the early PS/2 interface keyboard and mouse interface can not be mixed. Because one is two-way communication, the other is one-way communication.

3 、 RJ-45

It is our common network cable interface, and its history can be traced back to the RJ11 telephone line interface established by AT&T in 1960. There are two ways to connect RJ-45, T568A and T568B respectively. Our most common connection is T568B, that is, white orange-orange-white-green-blue-white-blue-green-white-brown-brown connection. In fact, under normal circumstances, you only need to connect four wires to work properly.

4 、 USB

USB was developed in 1994 by Microsoft, IBM,intel and other companies. At that time, there were not only a large number of COM ports, PS/2,LPT and other complicated interfaces, but also the problem that drivers had to be restarted before they could be used. So USB, which can be plug and play and support hot plug, arises at the historic moment. At present, USB can basically connect all external devices. The earliest USB1.0 transmission rate was only 1.5Mbps, but now the USB3.2 standard on the road has reached 20Gbps. The USB interface has many shapes, such as mico-USB,usb3.1-typec,Mini-An and so on.

5 、 Express Card

The Express Card interface was developed by the PCMCIA Association in 2003. For notebook expansion. It follows both PCI-E*1 and USB protocols and is several times faster than the old cardbus bus. Once the Express Card interface can be said to be very brilliant, and even some people have modified an external graphics card with Express Card, which can be seen its popularity. But now it has been replaced by a variety of new interfaces.

6. Lightning (Thunderbolt)

The earliest Thunderbolt interface was mainly developed by intel in 2009 to replace the USB interface. In 2011, the first version of Lightning went public with MBP, but because of its high licensing fees, it was unable to compete with the slower but 'free USB3.0, and finally did not become mainstream. The earliest lightning left PCI-E2.0x4 and DP1.1a agreement. Now Lightning 3 is a PCI-E3.0x4 and DP1.2 protocol. On the interface, Lightning 3 begins to keep the interface shape consistent with USB-TypeC. So the USB-C interface of some notebooks can do both lightning and USB.

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