Transcription: The three ports you see here are vital to how a computer handles input and output. Most PCs come with two serial ports. There are two sizes of serial port connectors. One has nine pins, and the other has 25 pins. Both do the same thing, it's just that on the 25-pin connector, most of the pins are not used. It's called a serial port because bits of data are sent one after the other, like soldiers marching single file through a gate. That's why the serial port is usually connected to a mouse, which sends so little data that speed isn't important, or to a modem, since current telephone lines can ...
(.mp4)
(PC-Computing).iso/content/indexscn.bmp){kind=link}