Testing my serial port?

[camilo@cancun.com]

Hi,

I would like to know, how can i test if me serial port is fried? my 
external modem that used to work just fine, stopped working.. both 
in windows and debian...(i dualboot) Its very strange  ,because from 
windows, i can query the modem, and it responds like it was all 
Ok... so how can i test if my serial port is the problem? 

Thanks...
Camilo

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