Asus TUEP2-M TUEP2-M User Manual - Page 28

3. H/W SETUP Expansion Cards 3. HARDWARE SETUP 3.7.2 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. If your motherboard has PCI audio onboard, an additional IRQ will be used. If your motherboard also has MIDI enabled, another IRQ will be used, leaving 4 IRQs free. Standard Interrupt Assignments IRQ Priority Standard Function 0 1 System Timer 1 2 Keyboard Controller 2 N/A Programmable Interrupt 3* 11 Communications Port (COM2) 4* 12 Communications Port (COM1) 5* 13 Sound Card (sometimes LPT2) 6 14 Floppy Disk Controller 7* 15 Printer Port (LPT1) 8 3 System CMOS/Real Time Clock 9* 4 ACPI Mode when enabled 10* 5 IRQ Holder for PCI Steering 11* 6 IRQ Holder for PCI Steering 12* 7 PS/2 Compatible Mouse Port 13 8 Numeric Data Processor 14* 9 Primary IDE Channel 15* 10 Secondary IDE Channel *These IRQs are usually available for ISA or PCI devices. Interrupt Request Table for this Motherboard Interrupt requests are shared as shown by the following table: PCI slot 1 PCI slot 2 PCI slot 3 Onboard USB controller HC0 Onboard USB controller HC1 AGP CNR LAN CNR Audio/Modem Onboard LAN ABCDE FGH - - - - - not shared not shared shared - - - not shared shared shared not shared - - - - not shared not shared - - - - - 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 will arise between the two PCI groups that will make the system unstable or cards inoperable. 28 ASUS TUEP2-M User's Manual