Serial Port Addresses - IBM Aptiva Series Handbook

Serial port addresses

IBM Aptiva PCs have a built-in external serial port already installed in the computer. 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.
The built-in serial port supports the following addresses and interrupts.
Table 9: Serial port addresses
Address COM#
3F8 COM1
2F8 COM2
3E8 COM3
2E8 COM4
Conflicts may arise if you add adapter cards with serial ports or if you change the address settings on your modem if you are
using an operating system other than Windows 95. You can resolve most of these conflicts by using Setup or the Windows 95
Device Manager to change serial port addresses. See "Devices and I/O Ports" on page 5-9 or "Resolving resource conflicts" on
page 6-3 for more information.
A-6 Appendix A: Specification tables
Interrupt Default
IRQ 4 Modem
IRQ 3 Serial port
IRQ 4
IRQ 3