Asus BP5120 User Manual - Page 34

2.5.3 Standard interrupt assignments Standard interrupt assignments IRQ Priority Standard Function 0 1 System Timer 1 2 Keyboard Controller 2 ­- Redirect to IRQ#9 3 10 Communications Port (COM1) 4 11 IRQ holder for PCI steering* 5 12 Standard Floppy Disk Controller 6 13 Printer Port (LPT1)* 7 3 System CMOS/Real Time Clock 8 4 IRQ holder for PCI steering* 9 5 IRQ holder for PCI steering* 10 6 IRQ holder for PCI steering* 11 7 PS/2 Compatible Mouse Port* 12 8 Numeric Data Processor 13 9 Primary IDE Channel * These IRQs are usually available for ISA or PCI devices. IRQ assignments for this motherboard A B C D E F G H PCI1 - - - shared - - ­- - PCI2 shared - - - PCIEX16_1 ­shared - - - PCIEX1_1 shared - - - Onboard USB controller 1 - ­- - - shared Onboard USB controller 2 - - - shared Onboard USB controller 3 - - shared - Onboard USB controller 4 shared - - - Onboard USB 2.0 controller - - - - - ­- ­- shared Onboard HD audio shared - - - - ­- ­- - Onboard LAN - 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. 2-12 Chapter 2: Basic installation