Accessing Port I/O Via Kernel Device Driver
In Windows-based computers, memory can also be accessed via specific drivers such as DOLLx8KD which gives I/O access in 8, 16 and 32-bit on most Windows platforms starting from Windows 95 up to Windows 7. Installing I/O Port drivers will ensure memory access by activating the drivers with simple DLL calls allowing Port I/O and when not needed, the driver can be closed to prevent unauthorized access to the I/O ports.
Read more about this topic: Memory-mapped I/O
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