Asus p4b266 Computer Hardware User Manual


 
2-14
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.
IRQ assignments for this motherboard
ABCDEFGH
PCI slot 1 shared
PCI slot 2 used
PCI slot 3 shared
PCI slot 4 shared
PCI slot 5 shared
PCI slot 6 used
Onboard USB controller HC0 used
Onboard USB controller HC1 used
Onboard USB 2.0 controller shared
AGP used
CNR LAN shared
CNR Audio/Modem used
Onboard 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, conflicts will arise between the two PCI groups, making the
system unstable and the card inoperable.