Question: which i/o address is used by the com2 port
Answer: COM1 : I / O port 0x3F8 , IRQ 4 COM2 : I / O port 0x2F8 , IRQ 3 COM3 : I / O port 0x3E8 , IRQ 4 COM4 : I / O port 0x2E8 , IRQ 3