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Each hardware driver on your system that performs I/O (input/output) must have a unique memory base address so that the system can locate it. This memory address is a three- or four-digit hexadecimal number, must match the settings on the adapter, and must not conflict with any other hardware on your system. Valid base addresses are displayed when you configure your adapter.
The I/O base address is the initial address for a unique area of memory allocated for input/output data control to a specific hardware adapter. For example, 0x300, or 300, is the default I/O base address for the 3Com 3c501 network adapter. The I/O base address must match the hardware configuration on the adapter, and other devices must not use this I/O base address.