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  Windows 2000 devices are all on IRQ 9 or IRQ 11  
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Windows 2000 devices are all on IRQ 9 or IRQ 11 (TTID #69)

Author: Travis   Views: 29,087 /  Created: August 29, 2001
Problem: You install Windows 2000 and all or most devices are on IRQ 9 or IRQ 11.

Reason: Windows 2000 has been installed in ACPI mode and that is how it assigns its plug and play resources. Usually it's all assigned to IRQ9, sometimes IRQ11. This single IRQ is used as a gateway to 255 virtual IRQs above IRQ 15.

Solution: You can do this procedure from a Windows 2000 CD install or from boot disks, they say you can not do this from bootdisks but I have tested this and there is no issues.

Installation of Windows 2000:

1. During the first phase of Setup, at the Setup is inspecting your computer's hardware configuration screen, press the F5 key. You will be prompted with new screen shortly asking about your system type.
2. Select the Standard PC Option
3. Continue with setup to complete the installation.

You can read more about ACPI and IRQ sharing under Windows 2000 in these articles:

General Description of IRQ Sharing in Windows 2000
Unable to Change a Resource Setting in Device Manager

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