Asus P3-PH5 P3-PH5 User's Manual for English Edtion - Page 30

Standard interrupt assignments 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* * These IRQs are usually available for ISA or PCI devices. IRQ assignments for the system motherboard A B C D E F PCI Slot 1 - - - - - used PCI Slot 2 - - - - - - PCI Express x16 slot shared - - - - - PCI Express x1 slot - shared - - - - USB controller 1 - - - - - - USB controller 2 - - - shared - - USB controller 3 - - shared - - - USB controller 4 shared - - - - - USB 2.0 controller - - - - - - LAN controller - - - - shared - Audio controller shared - - - - - G H - - used - - - - - - shared - - - - - - - shared - - - - 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, conflicts will arise between the two PCI groups, making the system unstable and the card inoperable. 2-14 Chapter 2: Basic installation