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Chapter 2: Hardware information
2.5.3 Interrupt assignments
Standard Interrupt Assignments
IRQ Priority Standard Function
0 1 System Timer
1 2 Keyboard Controller
2 N/A Programmable Interrupt
3* 11 IRQ Holder for PCI Steering
4* 12 Communications Port (COM1)
5* 13 Sound Card (sometimes LPT2)
6 14 Floppy Disk Controller
7* 15 Printer Port (LPT1)
8 3 System CMOS/Real Time Clock
9* 4 ACPI Mode when used
10* 5 IRQ Holder for PCI Steering
11* 6 IRQ Holder for PCI Steering
12* 7 PS/2 Compatible Mouse Port
13 8 Numeric Data Processor
14* 9 Primary IDE Channel
15* 10 Secondary IDE Channel
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
A B C D E F G H
PCI slot 1 shared — — — — — — —
PCI slot 2 — shared — — — — —
PCI slot 3 — — shared — — — — —
PCI slot 4 — — — shared — — — —
PCI Express x1 — — — — — — — shared
PCI Express x16 — — — — — — — shared
Gigabit LAN — — — — — — — shared
Marvell 6121 SATA — — — — — — — shared
SATA — shared — — — — — —
USB1 shared — — — — — — —
USB2 — shared — — — — — —
USB3 — — shared — — — — —
USB4 — — — shared — — — —
HD audio — shared — — — — — —
When using PCI cards on shared slots, ensure that the drivers
support “Share IRQ” or that the cards do not need IRQ assignments.
Otherwise, conicts will arise between the two PCI groups, making the
system unstable and the card inoperable.