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COM Interface
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- Time of issue:2021-12-08 16:25
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COM interface
COM interface is also called serial port. Most motherboards in the past provided two COM ports, COM1 and COM2.
The role of the COM interface is to connect devices such as a serial mouse and an external Modem.
The 1/O address of the COM1 interface is 03F8h-03FFh, and the interrupt number is IRQ4;
The 1O address of the COM2 interface is O2F8h-O2Fh, and the interrupt number is IRQ3.
Therefore, the COM2 interface has priority over the response of the COM1 interface. Later, serial devices such as mouse adopted PS2 interface and the current popular USB interface. External devices based on serial port are rare.
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