Asus A7N8X-VM 400 Motherboard DIY Troubleshooting Guide - Page 22

Expansion slots

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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. IRQ assignments for this motherboard A B PCI slot 1 used - PCI slot 2 - - PCI slot 3 - - AGP slot - used C D - - - used used - - - 1-12 Chapter 1: Product introduction

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1-12
Chapter 1:
Product introduction
IRQ assignments for this motherboard
A
B
C
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.