Dell GX240 manual D e f a u l t I R Q L i n e A s s i g n m e n t s, Used/Available, Line

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NOTE: The following table lists default IRQ settings. In computers with Plug and Play capabilities, you can modify the default settings. If you install a Plug and Play card in a Plug and Play computer, the computer automatically selects an open IRQ line if any are available.

D e f a u l t I R Q L i n e A s s i g n m e n t s

IRQ	Used/Available
Line
IRQ0	Used by the computer timer
IRQ1	Used by the keyboard to signal that the output buffer is full
IRQ2	Used by interrupt controller 1 to enable IRQ8 through IRQ15
IRQ3	Used by serial connector 2
IRQ4	Used by serial connector 1
IRQ5	Available
IRQ6	Used by the floppy/tape drive controller
IRQ7	Used by the parallel port
IRQ8	Used by the real-time clock (RTC)
IRQ9	Used by the video graphics array (VGA) interface (optional)
IRQ10	Available
IRQ11	Available
IRQ12	Used by the mouse port
IRQ13	Used by the math coprocessor (if applicable)
IRQ14	Used by the primary integrated drive electronics (IDE) controller
IRQ15	Used by the secondary IDE controller

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