Input/output port
Alternatively referred to as I/O address, I/O ports, and I/O port address, the input/output port is what allows the software drivers to communicate with hardware devices on your computer.
The I/O port assignment can be made either manually using DIP switches or automatically using PnP. When configuring the I/O port of any device in your computer, it is important that it does not share the same I/O port as another device or you will encounter a hardware conflict.
How can I view my computers Input/Output addresses?
To view how your computer has assigned your I/O addresses open Device Manager, click View at the top of the Device Manager window, click Resources by type, and then select Input/Output (IO). This should give you an output similar to the picture shown below.
Also see: Base address, DMA, Hardware conflict, Input, Input/output device, IRQ, Memory address, Output, Port