US Robotics Courier V.Everything 3CP3453 Getting Started Manual page 19

b
To change the IRQ setting, place the jumper over the
pins that correspond to the IRQ for the Courier: 3, 4, 5,
7, or 9.
Figure 2-5. Setting the IRQ Jumpers.
c
To change the COM port setting, (1, 2, 3, or 4), position
the jumpers in one of the following ways:
COM1
COM2
Figure 2-6. Setting the COM Port Jumpers.
d
Continue with Setting the DIP Switches.
COM3
COM4
Installing the Courier 2-7