1.8.1 Standard i
nterrupt assi
gnments
| IRQ | Priority | Standard Function |
| 0 | 1 | System Timer |
| 1 | 2 | Keyboard Controller |
| 2 | N/A | Programmable Interrupt |
| 3* | 11 | IRQ holder for PCI steering |
| 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 |
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1.8.2 I
RQ assi
gnments for thi
s motherboard
| A | B | C | D | E | F | G | H |
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PCI slot 1 | shared | — | — | — | — | — | — | — |
PCI slot 2 | — | shared | — | — | — | — | — | — |
PCI slot 3 | — | — | shared | — | — | — | — | — |
PCIe x1 slot 1 | shared | — | — | — | — | — | — | — |
PCIe x1 slot 2 | shared | — | — | — | — | — | — | — |
PCIe x16 slot | shared | — | — | — | — | — | — | — |
Onboard USB controller 1 | — | — | — | — | used | — | — | — |
Onboard USB controller 2 | — | — | — | — | — | used | — | — |
Onboard USB controller 3 | — | — | — | — | — | — | used | — |
Onboard USB 2.0 controller | — | — | — | — | — | — | — | used |
Onboard LAN | — | — | — | used | — | — | — | — |
Onboard Audio | — | — | shared | — | — | — | — | — |
Serial ATA | — | shared | — | — | — | — | — | — |
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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.
ASUS |