What are the computer serial port, parallel port and U-port round port lines? How to distinguish between serial port and parallel port?

The computer serial port, parallel port and U-port round port lines are very different, just look at the shape. Introduction is as follows:

Serial port: Also known as serial communication interface or serial communication interface (usually referred to as COM interface), it is an extended interface using serial communication, as shown in the following figure:

Parallel port: refers to the interface standard that uses parallel transmission to transmit data, as shown in the following figure:

U-port: Also known as usb interface, it is a common pc interface. It has only four wires, two power supplies and two signals, so the signals are transmitted in series. The USB interface is also called serial port, and the speed of usb2.0 can reach 480Mbps. As shown in the figure below, it is a USB interface, that is, a U-port:

Round port line: In fact, it refers to the PS2 interface line, which is a special interface line for mouse and keyboard and a 6-pin round interface line. As shown in the figure below, it is the PS2 line, that is, the round mouth line:

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