Monofunctional expansions cards:
Standard AGP and PCI expansion cards require a maximum of one interrupt, which is called the PCI interrupt INT A. Expansion cards that do not require an interrupt can be installed in any desired slot.
Multifunctional expansion cards or expansion cards with integrated
These expansion cards require up to four PCI interrupts: INT A, INT B, INT C, INT D. How many and which of these interrupts are used is specified in the documentation provided with the card.
The assignment of the PCI interrupts to the PCI IRQ Lines is shown in the following table:
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| Onboard Controller |
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| PCI slot |
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| USB 1,1 |
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| AC97 |
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PCI |
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Interrupt |
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Line | 1st | 2nd | 3rd | USB 2,0 | SMBus |
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| Modem |
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| 1 |
| 2 | |
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| Audio |
| LAN |
| AGP |
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1 | (A) | A | - | - | - | - | - |
| - | - | - |
| - |
| - |
2 | (B) | - | - | - | - | A | A |
| - | - | - |
| - |
| - |
3 | (C) | - | - | A | - | - | - |
| - | - | - |
| - |
| - |
4 | (D) | - | A | - | - | - | - |
| - | - | - |
| C |
| B |
5 | (E) | - | - | - | - | - | - |
| - | A | - |
| - |
| - |
6 | (F) | - | - | - | - | - | - |
| - | - | - |
| A |
| D |
7 | (G) | - | - | - | - | - | - |
| - | - | - |
| B |
| A |
8 | (H) | - | - | - | A | - | - |
| - | - | - |
| D |
| C |
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Use the first PCI slots that have a single PCI IRQ Line (no IRQ sharing). If you must use another PCI slot with IRQ sharing, check whether the expansion card properly supports IRQ sharing with the other devices on this PCI IRQ Line. The drivers of all cards and components on this PCI IRQ Line must also support IRQ sharing.
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