Dell Inspiron 3500 - Manual (Page 18)

1-8 Dell Inspiron 3500 Portable Computer Service Manual
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Table 1-1 lists the default interrupt assignments.
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IRQ0 Generated by the system timer
IRQ1 Generated by the keyboard controller to signal that the keyboard
output buffer is full
IRQ2 Programmable interrupt controller
IRQ3 Used by the communications port or modem
IRQ4 Used by the communications port (COM1)
IRQ5 Used by the audio controller
IRQ6 Generated by the diskette drive controller to indicate that the
diskette drive requires the attention of the microprocessor
IRQ7 Used by the parallel port
IRQ8 Generated by the system real-time clock (RTC)
IRQ9 Free
IRQ10 Shared by the USB and by the IRQ holder for PCI steering
IRQ11 Shared by the CardBus controller, the IRQ holder for PCI steer-
ing, and audio controller
IRQ12 Generated by the keyboard controller to indicate that the output
buffer of the integrated touch pad or external PS/2 mouse is full
IRQ13 Used by the math coprocessor on the microprocessor
IRQ14 Generated by the hard-disk drive to indicate that the drive
requires the attention of the microprocessor
IRQ15 Generated by the secondary IDE controller (CD-ROM drive or
DVD-ROM drive) to indicate that the drive requires attention of
the microprocessor