Quick Reference Guide
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Then select Mouse, COM Ports, and IRQ Status and note the
addresses and IRQs that are in use. If you find an IRQ conflict, note
which IRQs are not being used, then change one of the conflicting
devices to use one of the unused IRQs. If you find an address con-
flict, change the address of one of the conflicting devices.
To change a port address or IRQ in Windows 3.1x, double-click the
Control Panel icon, then the Ports icon. Click on the port you want
to change, click Settings, click Advanced, and select the new port
address and/or interrupt. If you want to use COM3 or COM4, note
that COM3 shares an IRQ with COM1, as COM4 does with COM2,
so you should change their IRQs to unused ones, if possible.
If you use Windows 95 or 98, right-click on My Computer, select
Properties from the menu, click on the Device Manager tab, dou-
ble-click on Ports, then double-click the communications port your
modem is connected to. In the port’s Properties dialog box, click
the Resources tab to see the port’s input/output range and inter-
rupt request. If another device is using the same address range or
IRQ, it will appear in the Conflicting Device List. Uncheck Use
automatic settings to change the port’s settings so they do not
conflict with the other device, or select the port the conflicting de-
vice is on, and change it instead. If you need to open your
computer to change switches or jumpers on the conflicting device;
refer to the documentation for the device.
If you use Windows NT 4.0, select in turn Start, Programs, Admin-
istrative Tools (Common), and Windows NT Diagnostics. In the
Windows NT Diagnostics dialog box, click on the Resources tab
to see address and IRQ assignments.
4
The serial port might be defective. If you have another serial port,
install the modem on it, change the COM port setting in your soft-
ware, and try again.
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