COM interface
Release time:
2021-12-08
COM interface
COM interface is also called serial port. Most motherboards in the past provided two COM interfaces, 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 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, the mouse and other serial devices using the PS2 interface and the current popularUSB interface, based on the serial port of the external device has been rare
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