I/O port Addresses
I/O port addresses are located in the Hardware Resources category in System Information. It is the communication channel among hardware devices in the system. I/O addresses are identifying in Hexadecimal number system. Unlike IRQ,s and DMA there are 65,535 ports addresses are exists number from 0000h to FFFFh. Virtually all system buses use I/O port addresses. Most of them are fairly standardized, meaning they would not be conflict or problem with these settings. Some common I/O addresses are listed below:
| Port | IO Address |
| COM1 | 3F8 |
| COM2 | 2F8 |
| COM3 | 3E8 |
| COM4 | 2E8 |
| LPT1 | 378 |
| LPT2 | 278 |
