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Whats wrong with the standard COM port addresses?

April 26, 2017addresses port standard wrong

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Whats wrong with the standard COM port addresses?

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A. Note the IRQs. Also, note that COM2: has a higher priority than COM1:. If, for example, serial 1 on a motherboard is enabled and you have a MODEM in the computer set to COM3:, there could be interrupt conflict problems. Those are the reasons I like to disable serial 2 in motherboard CMOS Setup and set internal MODEMs to COM2: I have seen a lot of computers come into my shop with MODEMs set to COM3: accompanied by customers wondering why they have problems connecting to and using the Internet.