3 interrupt assignments, 4 pci express x16 slot, Standard interrupt assignments – Asus K8N-LR User Manual
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Chapter 2: Hardware information
2.5.3 Interrupt assignments
Standard interrupt assignments
* These IRQs are usually available for ISA or PCI devices.
IRQ
Priority
Standard Function
0
1
System Timer
1
2
Keyboard Controller
2
–
Programmable interrupt
3
11
Communications Port (COM2)
4
12
Communications Port (COM1)*
5
13
IRQ holder for PCI steering*
6
14
Floppy Disk Controller
7
15
Printer Port (LPT1)*
8
3
System CMOS/Real Time Clock
9
4
IRQ holder for PCI steering*
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
2.5.4 PCI Express x16 slot
This motherboard supports PCI Express
x16 graphic cards that comply with
the PCI Express specifications. The
figure shows a graphics card installed
on the PCI Express x16 slot.
Due to hardware limitation, the PCI Express x16 slot runs at x8, x4, and
x1 speeds only.