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Chapter 2: Basic installation
Standard interrupt assignments
* These IRQs are usually available for ISA or PCI devices.
IRQ assignments for the system motherboard
When using a PCI card on shared slots, ensure that the drivers support “Share
IRQ” or that the cards do not need IRQ assignments; otherwise, conicts will
arise between the two PCI groups, making the system unstable and the card
inoperable.
IRQ Standard function
0 System Timer
1
Keyboard Controller
2 Programmable Interrupt
4 Communications Port (COM1)
6 Floppy Disk Controller
7 Printer Port (LPT1)*
8 System CMOS/Real Time Clock
9 ACPI mode when used*
10 IRQ Holder for PCI Steering*
11 IRQ Holder for PCI Steering*
12 PS/2 Compatible Mouse Port*
13 Numeric Data Processor
14 Primary IDE Channel*
A B C D E F G H
PCI Slot 1
- - - - - used - -
PCI Slot 2 - - - - - - used -
PCI Express x16 slot shared - - - - - - -
PCI Express x1 slot - shared - - - - - -
USB controller 1 - - - - - - - shared
USB controller 2 - - - shared - - - -
USB controller 3 - - shared - - - - -
USB controller 4 shared - - - - - - -
USB 2.0 controller - - - - - - - shared
LAN controller - - - - shared - - -
Audio controller
shared - - - - - - -