However, a serial mouse as well as other peripheral devices can also interact with a computer via a serial interface. If the parallel port was mainly used to connect printers, the COM port (by the way, COM is short for communication) usually worked with telecommunication devices such as modems. However, its scope of application was somewhat different from that of the parallel port. On first machines, the COM port was used for connecting peripheral devices. The serial port appeared long before personal computers of the IBM architecture were introduced.
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