2.5.2Configuring an expansion card
After installing the expansion card, configure the it by adjusting the software settings.
1.Turn on the system and change the necessary BIOS settings, if any. See Chapter 5 for information on BIOS setup.
2.Assign an IRQ to the card. Refer to the following tables.
3.Install the software drivers for the expansion card.
Standard interrupt assignments
IRQ | Priority | Standard Function |
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0 | 1 | System Timer |
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1 | 2 | Keyboard Controller |
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2 | N/A | Programmable Interrupt |
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3* | 11 | Communications Port (COM2) |
4* | 12 | Communications Port (COM1) |
5* | 13 | Sound Card (sometimes LPT2) |
6 | 14 | Floppy Disk Controller |
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7* | 15 | Printer Port (LPT1) |
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8 | 3 | System CMOS/Real Time Clock |
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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 |
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13 | 8 | Numeric Data Processor |
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14* | 9 | Primary IDE Channel |
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15* | 10 | Secondary IDE Channel |
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*These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
| INTA# | INTB# | INTC# | INTD# | REQ# | GNT# |
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PXIRQ2 | — | — | — | X_REQ3 | X_GNT3 |
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ATI Rage XL | PIRQB# | — | — | — | REQ2# | GNT2# |
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BCM5705E | PIRQF# | — | — | — | REQ3# | GNT3# |
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PCIX slot 1 | PXIRQ0 | PXIRQ1 | PXIRQ2 | PXIRQ3 | X_REQ0 | X_GNT0 |
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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 | 2 - 13 |