How to track in Windows 7, what and where does the driver write when interacting with the device?

There are several COM ports on the laptop, but one of them is buggy - Linux or MS DOS cannot read its registers at the base I / O address 0x2f8 - 0xff is always returned. But in Windows 7, this port works fine.

How to keep track of what and in what registers the standard serial port driver writes in Windows 7? The laptop can be connected via COM port to another computer for debugging, there is no network on it.