Asus Motherboard A7N8X-VM User's Guide download pdf (Page 22)

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Chapter 1: Product introduction

IRQ assignments for this motherboard

ABC D

PCI slot 1 used –––

PCI slot 2 –– –used

PCI slot 3 ––used –

AGP slot – used ––

1.10 Expansion slots

The motherboard has three PCI and one Accelerated Graphics Port (AGP) slots.

The following sections describe the slots and the expansion cards that they

support.

1.10.1 Configuring an expansion card

Some expansion cards need an IRQ to operate. Generally, an IRQ must be

exclusively assigned to one function at a time. In a standard design configuration,

16 IRQs are available but most are already in use.

Normally, six IRQs are free for expansion cards. Sometimes IRQs are “shared” by

more than one function; in this case, IRQ assignments are swapped automatically

or adjusted through the BIOS Setup.

Standard Interrupt Assignments

IRQ Standard Function

0 System Timer

1 Keyboard Controller

2 Programmable Interrupt Controller

3* USB Universal Host Controller

4* Communications Port (COM1)

5* Onboard Audio

6 Standard Floppy Disk Controller

7* Printer Port (LPT1)

8 System CMOS/Real Time Clock

9* Onboard LAN

10* USB Universal Host Controller

11* Onboard VGA

12* PS/2 Compatible Mouse Port

13 Numeric Data Processor

14* Ultra ATA Controller

15* Secondary Ultra ATA Controller

*These IRQs are usually available for ISA or PCI devices.

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Asus Motherboard A7N8X-VM User's Guide Page 22