Asus AP1720-I5 PRL-DL M/B User Guide - Page 38

Standard Interrupt Assignments, IRQ assignments for this motherboard

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Standard Interrupt Assignments IRQ Priority Standard Function 0 1 System Timer 1 2 Keyboard Controller 2 N/A Programmable Interrupt 3* 11 Communications Port (COM2) 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 PCI slot 1 PCI slot 2 PCI slot 3 PCI slot 4 PCI32 slot 5 PCI32 slot 6 Onboard 82540 controller Onboard VGA controller PCI INTA 8 12 17 19 23 27 2 1 PCI INTB 9 13 18 20 24 28 - - PCI INTC 10 14 19 21 25 29 - - PCI INTD 11 15 20 22 26 30 - - When using PCI cards on shared slots, ensure that the drivers support "Share IRQ" or that the cards do not need IRQ assignments. Otherwise, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable. 2-12 Chapter 2: Hardware information

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2-12
Chapter 2: Hardware information
Standard Interrupt Assignments
IRQ
Priority
Standard Function
0
1
System Timer
1
2
Keyboard Controller
2
N/A
Programmable Interrupt
3*
11
Communications Port (COM2)
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.
When using PCI cards on shared slots, ensure that the drivers support
“Share IRQ” or that the cards do not need IRQ assignments.
Otherwise, conflicts will arise between the two PCI groups, making the
system unstable and the card inoperable.
IRQ assignments for this motherboard
PCI INTA
PCI INTB
PCI INTC
PCI INTD
PCI
slot 1
8
9
10
11
PCI
slot 2
12
13
14
15
PCI
slot 3
17
18
19
20
PCI
slot 4
19
20
21
22
PCI32
slot 5
23
24
25
26
PCI32
slot 6
27
28
29
30
Onboard 82540 controller
2
—
—
—
Onboard VGA controller
1
—
—
—