User Manual

ASUS A7S266-VM/U2 Motherboard 1-11
1.9 Expansion slots
The A7S266-VM/U2 motherboard has four (4) expansion slots. The following sub-
sections describe the slots and the expansion cards that they support.
1.9.1 Configuring an expansion card
After physically installing the expansion card, configure the card by adjusting the
software settings.
1. Turn on the system and change the necessary BIOS settings, if any.
2. Assign an IRQ to the card. Refer to the tables below.
3. Install the software drivers for the expansion card.
1.9.2 Standard Interrupt Assignments
IRQ Standard Function
0 System Timer
1 Keyboard Controller
2 Programmable Interrupt Controller
3* Communications Port (COM2)
4* Communications Port (COM1)
5* Onboard LAN
6 Standard Floppy Disk Controller
7* Printer Port (LPT1)
8 System CMOS/Real Time Clock
9* USB Host Controller
10* Onboard Audio
11* Onboard VGA
12* PS/2 Compatible Mouse Port
13 Numeric Data Processor
14* Primary IDE Controller
15* Secondary IDE Controller
*These IRQs are usually available for ISA or PCI devices.
IRQ assignments for this motherboard
ABCDEFGH
PCI slot 1 shared — — — — — — —
PCI slot 2 — used — — — — — —
PCI slot 3 — — used — — — — —
PCI slot 4 — — — shared — — — —
Onboard USB controller HC0 — — — — used — — —
Onboard USB controller HC1 — — — — — used — —
Onboard USB controller HC2 — — — — — — used —
Onboard USB controller HC3 — — — — — — — used
Onboard LAN — — — shared — — — —
Onboard Audio shared — — — — — — —
Onboard VGA shared — — — — — — —
When using PCI cards on shared slots, ensure that the drivers support “Share
IRQ” or that the cards do not need IRQ assignments. Otherwise, conflicts will
arise between two PCI groups.