COM Port and IRQ

Standard COM Port and IRQ - serial port (RS232)

COM1 - IRQ4 - 3F8
COM2 - IRQ3 - 2F8
COM3 - IRQ5 - 3E8
COM4 - IRQ7 - 2E8

Standard common IRQ Device in PC
0 System Timer
1 Keyboard
2 Video card
3 COM2
4 COM1
5
6 Floppy Disk
7 LPT1
8 CMOS/Real time clock
9 cascade
10
11 Display
12 PS/2 mouse
13 Numeric Data Processor
14 Primary IDE
15 Secondary IDE