102-5 To install the Expansion CardsWARNING! Turn off your power when adding or removing expansion cards or other systemcomponents. Failure to do so may cause severe damage to both yourmotherboard and expansion cards.2-5-1 Procedure For Expansion Card Installation1. To read documentations or manuals for your expansion cards and make any necessaryhardware or software settings for your expansion card such as jumpers.2. To remove your computer’s cover and the bracket plate on the slot you intend to use.3. To align the card’s connectors and press firmly.4. To secure the card on the slot with the screen you remove above.5. To replace the computer system’s cover.6. To set up the BIOS if it’s necessary.7. To install the necessary software drivers for your expansion cards.2-5-2 Assigning IRQs For Expansion CardSome expansion cards need to assign an IRQ address to operate. Generally speaking, an IRQaddress must exclusively assign to one use only. With standard factory design, there are 16 IRQsavailable, but most of them are already in use.Standard Interrupt AssignmentsIRQ Priority Standard function0 N/A System Timer1 N/A Keyboard Controller2 N/A Programmable Interrupt3 * 8 Communications Port (COM2)4 * 9 Communications Port (COM1)5 * 6 Sound Card (sometimes LPT2)6 * 11 Floppy Disk Controller7 * 7 Printer Port (LPT1)8 N/A System CMOS/Real Time Clock9 * 10 ACPI Mode when enabled10 * 3 IRQ Holder for PCI Steering11 * 2 IRQ Holder for PCI Steering12 * 4 PS/2 Compatible Mouse Port13 N/A Numeric Data Processor14 * 5 Primary IDE Channel15 * 1 Secondary IDE Channel* These IRQs are usually available for ISA or PCI devices.