146 Appendix A: Specification tables
Serial port addresses
IBM Aptiva PCs have a built-in external serial port already installed on the system board. The connector for this port is
located at the back of your computer. This port can be used to connect a serial mouse, serial printer, or other serial
device and to transfer data between computers.
Table 13 shows the addresses and interrupts supported by the built-in serial port.
If you are using an operating system other than Windows 95, conflicts may arise if you add adapter cards with serial
ports or if you change the address settings on your modem. You can resolve most of these conflicts by using the Setup
Utility to change serial port addresses. See “Changing input/output port configuration” on page 37 for more
information.
Table 13: Serial port addresses and interrupts
Windows 95 Address Interrupt Default
COM1 03F8 IRQ 10, 4 Modem
COM2 02F8 IRQ 3 Serial port A
COM3 03E8 IRQ 4 none
COM4 02E8 IRQ 3 none
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