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[[PCI Virtual IRQ Assignment in Windows 2000/XP]] discusses virtual IRQs and offers a method which you can use to force PCI cards to use real IRQs as opposed to virtual ones. By stopping the XP installation eary with an F5 keypress and selecting "Standard PC with C-Step i486," ACPI compliance was not loaded during the Windows installation. This is an install time option only. This caused the Pico PCI CCTV cards to load on real IRQ's, such as 10 and 11, rather than those high IRQ's, such as 19 and 20.[[PCI Virtual IRQ Assignment in Windows 2000/XP]] discusses virtual IRQs and offers a method which you can use to force PCI cards to use real IRQs as opposed to virtual ones. By stopping the XP installation early with an F5 keypress and selecting "Standard PC with C-Step i486," ACPI compliance was not loaded during the Windows installation. This is an install time option only. This caused the Pico PCI CCTV cards to load on real IRQ's, such as 10 and 11, rather than those high IRQ's, such as 19 and 20.