Expanding Your Computer 4-4Connecting a Serial DeviceYour computer has one serial port for connecting a serial device such as aserial mouse or serial communication device (modem).Follow this procedure to connect a serial device:1. Make sure the “Serial Port COM1” item is set properly in the BIOSSetup program. (See “Advanced Menu” in Chapter 5 forinformation.)2. Make sure the computer is not turned on.3. Plug the device cable to the serial port on the rear of the computer.4. Turn on the computer.NOTE: Portable modems that derive power through the serial port cannot be used withthe computer. Instead, use a modem that is powered by its own internal battery orexternal AC power.