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22 ASUS TRL-DLS User’s Manual
3. HARDWARE SETUP
The following table lists the default IRQ assignments for standard PC devices. Use
this table when configuring your system and for resolving IRQ conflicts.
ISA Interrupt (IRQ) Assignments
ISA INT Priority Standard Function
ISA 00 1 System Timer
ISA 01 2 Keyboard Controller
ISA 02 N/A Programmable Interrupt
ISA 03* 11 Communications Port (COM2)
ISA 04* 12 Communications Port (COM1)
ISA 05* 13 Sound Card (sometimes LPT2)
ISA 06 14 Floppy Disk Controller
ISA 07* 15 Printer Port (LPT1)
ISA 08 3 System CMOS/Real Time Clock
ISA 09* 4 ACPI Mode when used
ISA 10* 5 IRQ Holder for PCI Steering
ISA 11* 6 IRQ Holder for PCI Steering
ISA 12* 7 PS/2 Compatible Mouse Port
ISA 13 8 Numeric Data Processor
ISA 14* 9 Primary IDE Channel
ISA 15* 10 Secondary IDE Channel
*These IRQs are usually available for PCI devices.
PCI Interrupt (IRQ) Assignments
PCI Slot PCI INTA PCI INTB PCI INTC PCI INTD
1 (64-bit) PCI 1 PCI 12 PCI 13 PCI 14
2 (64-bit) PCI 4 PCI 15 PCI 16 PCI 17
3 (64-bit) PCI 5 PCI 18 PCI 19 PCI 20
4 (64-bit) PCI 8 PCI 21 PCI 22 PCI 23
5 (32-bit) PCI 9 PCI 24 PCI 25 PCI 26
6 (32-bit) PCI 10 PCI 27 PCI 28 PCI 29
Expansion Cards
3. H/W SETUP