Asus CUR-DLS CUR-DLS User Manual - Page 21

3. H/W SETUP System Memory 3. HARDWARE SETUP 3.7.2 Assigning IRQs for Expansion Cards This is applicable only when MPS 1.4 Support is Disabled in section 4.6 Boot Menu. 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. 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. The following table lists the default IRQ assignments for standard PC devices. Use this table when configuring your system and for resolving IRQ conflicts. ISA Interrupt (IRQ) Assignments ISA INT ISA 00 ISA 01 ISA 02 ISA 03* ISA 04* ISA 05* ISA 06 ISA 07* ISA 08 ISA 09* ISA 10* ISA 11* ISA 12* ISA 13 ISA 14* ISA 15* Priority 1 2 N/A 11 12 13 14 15 3 4 5 6 7 8 9 10 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 *These IRQs are usually available for PCI devices. PCI Interrupt (IRQ) Assignments PCI Slot 1 (32-bit) 2 (32-bit) 3 (32-bit) 4 (32-bit) 5 (64-bit) 6 (64-bit) 7 (32-bit) PCI INTA PCI 00 PCI 01 PCI 02 PCI 03 PCI 05 PCI 06 PCI 07 PCI INTB PCI 10 PCI 12 PCI 11 PCI 13 PCI 15 PCI 14 PCI 13 PCI INTC PCI INTD PCI 11 PCI 12 PCI 10 PCI 11 PCI 12 PCI 10 PCI 14 PCI 15 PCI 13 PCI 14 PCI 15 PCI 13 PCI 14 PCI 15 ASUS CUR-DLS User's Manual 21