2400 BPS Internal Modem (250-1034) Addendum Faxback Doc. # 5048 COM PORT SETTINGS This modem was preset at the factory to operate on COM1. If you use it with a Tandy computer or any other computer that uses COM1 for another device (such as a mouse), reset this modem to operate on COM2. See Page 16 of the modem owner's manual for details. XENIX AND 3COM USERS XENIX and 3COM use DTR (data terminal ready) to turn the modem on and off. When you turn on your computer or when you send the modem an ATZ command, the modem ignores DTR. You must enable DTR using the modem's &D2 command for the modem to hang up the phone properly and return to the command mode when you disconnect from XENIX or 3COM. (smm 07/29/93)