Installing a Non-Plug-n-Play Internal Modem 13
Understanding COM Ports
and IRQ Settings
To successfully install your modem, you need to select a COM port
and IRQ setting that your computer's operating system is not using.
COM Ports
A COM port is a serial setting built into your computer's
motherboard. DOS version 3.3 and higher supports four COM ports.
Windows 95/98 and OS/2 support eight COM ports. COM ports use
IRQ lines to access your computer's processor.
IRQ Settings
An IRQ setting describes an interrupt line that is allocated to a
peripheral device, such as a modem, printer, or sound card. The
address allows the device to interrupt your computer's processor for
attention so that it can perform another function or activity.
Here are some common default COM port and IRQ settings for your
reference.
COM
Port
Address Default IRQ
1 3f8 4
2 2f8 3
3 3e8 4
4 2e8 3
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