Intel 630 User Manual - Page 19

2-5-2 Assigning IRQs For Expansion Card Some expansion cards need an IRQ to operate. Generally, an IRQ must exclusively assign to one use. In a standard design, there are 16 IRQs available but most of them are already in use. Standard Interrupt Assignments IRQ 0 1 2 3 * 4 * 5 * 6 7 * 8 9 * 10 * 11 * 12 * 13 14 * 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 enabled 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 ISA or PCI devices. 2-5-3 Interrupt Request Table For This Motherboard Interrupt request are shared as shown the table below: PCI slot 1 PCI slot 2 PCI slot 3 Onboard VGA AC97/MC97 Onboard USB Onboard USB 2 LAN (for 630TCF Only) INT A INT B Shared    Shared    INT C  Shared Shared INT D   Shared   Shared Shared  IMPORTANT! If using PCI cards on shared slots, make sure that the drivers support "Shared IRQ" or that the cards don't need IRQ assignments. Conflicts will arise between the two PCI groups that will make the system unstable or cards inoperable. 16