[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System Resources | Interrupts (IRQs) | IRQ Details By Number ]

IRQ1

IRQ Number: 1

16-Bit Priority: 2

Bus Line: No

Typical Default Use: Keyboard / keyboard controller.

Other Common Uses: None; for system use only.

Description: This is the reserved interrupt for the keyboard controller. It is used exclusively for keyboard input. Even on systems without a keyboard, IRQ1 is not available for use by other devices. Note that the keyboard controller also controls the PS/2 style mouse if the system has one, but the mouse uses a separate line, IRQ12.

Conflicts: This is a dedicated interrupt line; there should never be any conflicts. If software indicates a conflict on this IRQ, there is a good possibility of a hardware problem somewhere on your system board; this can be a motherboard or chipset (keyboard controller) problem.

Next: IRQ2

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