COM Port



The PC has one Serial Port, a Modem is used (using COM1) we need to add a
device to the Serial port and and a different COM port than the Modem uses so
we try to set up COM3 but XP Pro is never happy with it. The COM3 ALWAYS has
a Yellow ! on it.
How do we get COM3 to work in this PC?

Joe Grover

You need to either assign COM3 different hardware addresses, or not use
COM1. By default COM1 and COM3 use the same resources, as do COM2 and COM4.

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