Asus A7V8X-MX SE A7V8X-MX SE User's Manual - Page 20

1.10 Expansion slots The A7V8X-MX SE motherboard has three (3) PCI slots 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. IRQ assignments for this motherboard PCI slot 1 PCI slot 2 PCI slot 3 AGP slot A shared -- -- shared B -- shared -- -- C -- -- shared -- 1-12 Chapter 1: Product introduction