Setup Problems in Windows 95
51
COM Port Assignments
COM port problems may result from conflicting port
assignments (a frequent problem on computers with
preconfigured ports) or may be due to restrictions on what
COM ports your communications application recognizes.
COM port problems may appear at startup or remain
hidden until you attempt to use your communications
application with the LAN+Modem card modem. Watch for
the following symptoms:
■
The LAN function appears to work normally, but the
computer locks up when you try to use the modem.
■
The system may show a valid COM port setting for the
modem, but your application doesn’t recognize it.
■
In the Control Panel/System/Device Manager list, a
yellow exclamation point may appear next to the 3Com
LAN+Modem card listing Modems, but the Network
Adapter and Multifunction Adapter listings appear to
be functioning correctly.
■
When booting, the system signals a problem with a
descending tone or a low-level monotone.
If you are having any of these problems, try reassigning the
COM ports. The most efficient way to change COM port
assignments is to use the system or BIOS setup utility
provided by your computer manufacturer. Typically, this
setup utility is either an application that runs under the
operating system or a program started by pressing a
particular key or key sequence when booting. Refer to the
owner’s manual provided with your computer for details on
using the setup tools provided with your computer.
To set COM ports for the LAN+Modem card:
1 Start your system or BIOS setup utility.
Refer to your computer owner’s manual for directions on
how to run your system or BIOS setup utility.
2 Set your computer’s serial port to COM1.
If COM1 is not an option, assign the serial port to the
address 3F8,4 (3F8 is the memory address for COM1. 4
is the Interrupt).