User guide

ASUS PCH-DR motherboard 2-17
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.
Standard interrupt assignments
IRQ assignments for this motherboard
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.
INTA# INTB# INTC# INTD#
PCI slot 1 IRQ_F# IRQ_G# IRQ_H# IRQ_E#
PCI slot 2 IRQ_G# IRQ_H# IRQ_E# IRQ_F#
PCI slot 3 IRQ_H# IRQ_E# IRQ_F# IRQ_G#
PCI-X slot 1 PI_IRQ0# PI_IRQ1# PI_IRQ2# PI_IRQ3#
PCI-X slot 2 PI_IRQ1# PI_IRQ2# PI_IRQ3# PI_IRQ0#
Onbd. USB controller #1 IRQ_A# ———
Onbd. USB controller #2 IRQ_D# ———
Onbd. USB 2.0 controller IRQ_H# ———
Onbd. LAN controller (Intel 82547GI) IRQ_F# ———
Onbd. LAN controller (Intel 82541GI) IRQ_G# ———
Onbd. RAID controller (Promise 20378) IRQ_H# ———
Onbd. IDE controller IRQ_C# ———
Onbd. VGA controller (ATi Rage XL) IRQ_E# ———
Onbd. SATA controller (6300ESB ICH) IRQ_C# ———