2.5.3Interrupt assignments

Standard interrupt assignments

IRQ

Priority

Standard function

0

1

System Timer

1

2

Keyboard Controller

2

–

Redirect to IRQ#9

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

* These IRQs are usually available for ISA or PCI devices.

2.5.4PCI Express x16 slot

This motherboard supports a PCI Express x16 graphics card that comply with the PCI Express specifications. The figure shows a graphics card installed on the PCI Express x 16 slot.

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Chapter 2: Hardware information