2-5 Expansion Cards
WARNING! Turn off your power when adding or removing expansion cards or other system components. Failure to do so may cause severe damage to both your motherboard and expansion cards.
2-5-1 Procedure For Expansion Card Installation
1.Read the documentation for your expansion card and make any necessary hardware or software setting for your expansion card such as jumpers.
2.Remove your computer’s cover and the bracket plate on the slot you intend to use.
3.Align the card’s connectors and press firmly.
4.Secure the card on the slot with the screen you remove above.
5.Replace the computer system’s cover.
6.Set up the BIOS if necessary.
7.Install the necessary software driver for your expansion card.
2-5-2 Assigning IRQs For Expansion Card
Some expansion cards need an IRQ to operate. Generally, an IRQ must exclusively assign to one use. In a standard design, there are 16 IRQs available but most of them are already in use.
Standard Interrupt Assignments
IRQ | Priority | Standard function |
0 | N/A | System Timer |
1 | N/A | Keyboard Controller |
2 | N/A | Programmable Interrupt |
3 * | 8 | Communications Port (COM2) |
4 * | 9 | Communications Port (COM1) |
5 * | 6 | Sound Card (sometimes LPT2) |
6 * | N/A | Floppy Disk Controller |
7 * | 7 | Printer Port (LPT1) |
8 | N/A | System CMOS/Real Time Clock |
9 * | 10 | ACPI Mode when enabled |
10 * | 3 | IRQ Holder for PCI Steering |
11 * | 2 | IRQ Holder for PCI Steering |
12 * | 4 | PS/2 Compatible Mouse Port |
13 | N/A | Numeric Data Processor |
14 * | 5 | Primary IDE Channel |
15 * | N/A | Secondary IDE Channel |
* These IRQs are usually available for ISA or PCI devices.
2-5-3 Interrupt Request Table For This Motherboard
Interrupt request are shared as shown the table below:
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| INT A | INT B | INT C | INT D |
| INT E | INT F | INT G | INT H |
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Slot 1 |
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Onboard VGA |
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Onboard USB 1 |
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Onboard USB 2 |
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LAN |
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AC97/MC97 |
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IMPORTANT! | If using PCI cards on shared slots, make sure that the drivers support “Shared IRQ” or |
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| that the cards don’t need IRQ assignments. Conflicts will arise between the two PCI |
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| groups that will make the system unstable or cards inoperable. |
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