Expansion Cards - Asus Terminator K7 User Manual

3.8 Expansion Cards

In the future, you may need to install expansion cards. The
motherboard has two PCI expansion slots to support PCI cards. Refer
to 2.8 Install a PCI Expansion Card section when installing
expansion cards.
WARNING!
Unplug the system power cord when adding or removing expansion
cards or other system components. Failure to do so may cause severe
damage to both the motherboard and expansion cards.
3.8.1 Assigning IRQs for Expansion Cards
Some expansion cards need an IRQ to operate. Generally, an IRQ
must be exclusively assigned to one use. In a standard design, there
are 16 IRQs available but most of them are already in use, leaving 6
IRQs free for expansion cards.
IMPORTANT: If using PCI cards on shared slots, make sure that the
drivers support "Share IRQ" or that the cards do not need IRQ
assignments. Conflicts arise between the two PCI groups that makes
the system unstable or cards inoperable.
The following table lists the default IRQ assignments for standard
PC devices. Use this table when configuring your system and for
resolving IRQ conflicts.
Standard Interrupt Assignments
IRQ Priority
0
1
2
3*
4*
5*
6
7*
8
9*
10*
11*
12*
13
14*
15*
*These IRQs are usually available for ISA or PCI devices.
48
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
Chapter 3: Motherboard Information
Standard Function
System Timer
Keyboard Controller
Programmable Interrupt
Communications Port (COM2)
Communications Port (COM1)
Sound Card (sometimes LPT2)
Floppy Disk Controller
Printer Port (LPT1)
System CMOS/Real Time Clock
ACPI Mode when used
IRQ Holder for PCI Steering
IRQ Holder for PCI Steering
PS/2 Compatible Mouse Port
Numeric Data Processor
Primary IDE Channel
Secondary IDE Channel