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Windows 3.x/MS-DOS Installation 4-33
COM Ports, IRQs, and I/O Base Addresses
Automatic COM Port Detection
The PRO/100 PC Card drivers will automatically configure a COM port
on the system. The driver scans the BIOS table for the first unused COM
port, then checks to see if the corresponding IRQ is in use. If it is, it
moves to the next available COM port.
This process takes precedence over the network resources. If you specify a
network IRQ that is the same as the first available COM IRQ (3 or 4), the
driver will respond with an error.
To force a COM port, use the COMx keyword described in the following
heading. If you do not want a COM port, add the NOCOM keyword to
your configuration file or command line.
Manually Setting COM Port, Interrupt, and I/O Address
Values
Use the COMx keyword to manually specify which COM port the PRO/
100 PC Card should use when providing erial port emulation for modem
operations. Values for x can be 1, 2, 3, or 4. Each of these settings also
activates a specific set of predefined values for I/O address and interrupt
level, as follows:
PORT IRQ IOADDRESS
COM1 4 03F8
COM2 3 02F8
COM3 4 03E8
COM4 3 02E8
Do not select a COM port that is currently used by any other system
device, such as the PC Card interface itself, or a mouse or trackball.
Note
Configure your communications software to the COM port you
selected with the COMx keyword.
By default the LAN drivers will select the first open COM port. You can
add the COMx keyword and a port number to the LAN driver configura-