Asus A7V266-MX User's Guide download pdf (Page 20)

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Chapter 1: Product introduction

IRQ assignments for this motherboard

ABCD

PCI slot 1 shared –––

PCI slot 2 – shared ––

PCI slot 3 ––shared –

AGP slot shared –––

1.10 Expansion slots

The A7V266-MX motherboard has three (3) PCI and one (1) Accelerated Graphics

Port (AGP). The following sub-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, 6 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 firmware.

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 A7V266-MX User's Guide Page 20