If PCI attempts to use an IRQ that is used by a legacy ISA devicehow can you force PCI to IRQ?

Answer 1

In the context of computer systems, IRQ (Interrupt Request) lines are used by hardware devices to communicate with the CPU. However, there might be instances where you'd prefer certain devices not to use IRQs.

If you wish to prevent a PCI (Peripheral Component Interconnect) device from using an IRQ, you generally have to go through the system's BIOS (Basic Input Output System) settings. The BIOS interface varies among manufacturers, but usually, you can access it by pressing a specific key (like F2, F10, or Del) during the system startup.

Once in the BIOS settings, look for options related to IRQ assignments for PCI devices. This setting might be under different menus based on the specific BIOS version. Once located, you can change the IRQ settings to manual and then disable the IRQ for the specific PCI slot.

Remember that changing BIOS settings should be performed with caution, as incorrect configurations can lead to system instability. Always ensure you understand what each setting does before making adjustments. Also, refer to your motherboard's manual for specific instructions.

Answer 2

in cmos setup you specify that that particular irq is assigned to a legacy device. p.434

Answer 3

The PCI devices must all share at least one IRQ; ALL devices need an IRQ to be functional. XP and Vista will automatically assign all PCI devices to a single IRQ (IRQ 9) whenever possible.

Answer 4

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