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ASUS P4BGL-MX Motherboard
1-9
1.9.2 Standard Interrupt Assignments
IRQ Standard Function
0 System Timer
1 Keyboard Controller
2 Programmable Interrupt Controller
3 Communications Port (COM2)
4 Communications Port (COM1)
5 IRQ Holder for PCI IRQ Steering
6 Standard Floppy Disk Controller
7 ECP Printer Port (LPT1)
8 System CMOS/Real Time Clock
9 IRQ Holder for PCI IRQ Steering
10 IRQ Holder for PCI IRQ Steering
11 IRQ Holder for PCI IRQ Steering
12 PS/2 Compatible Mouse Port
13 Numeric Data Processor
14 Primary IDE controller (dual fifo)
15 Secondary Ultra ATA Controller (dual fifo)
*These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
ABCDEFGH
PCI slot 1 — — — — — used — —
PCI slot 2 — — — — — — used —
PCI slot 3 — — — — — — — shared
Onboard USB 1.1 controller 1 shared — — — — — — —
Onboard USB 1.1 controller 2 — — — used — — — —
Onboard USB 1.1 controller 3 — — used — — — — —
Onboard USB 2.0 controller — — — — — — — shared
Onboard LAN — shared — — — — — —
Onboard Audio — shared — — — — — —
Onboard VGA 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 two PCI groups.