MultiMobile MT128ZLX User Guide 4: Windows NT Driver Procedures
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2. Go to Start | Programs | Administrative Tools | Windows NT Diagnostics.
Select the Resources tab and the IRQ button.
Verify that the ISDN-TA device is assigned to the IRQ that you selected earlier.
3. Under the Resources tab, click the I/O Port button.
Verify that the ISDN-TA device is using the I/O address that you selected earlier.