Right now,there is more problem. I tried to change COM from BIOS, but after that, I even cannot get COM2 anymore (actually, I tried to restart several times and changed different parameter, even chaged to auto for IRQ3). Only get COM1 & COM3. I tried install port, windows scanned, and found there was more port, but cannot be installed by windows. And Modem cannot be found too.
My Modem is Aopen 56k FM ITU2.