User Guide

1-8 Chapter 1: Motherboard Information
1.6 Expansion slots
The P4BGL-ED has only one expansion slot exclusive for a PCI riser;
when a PCI riser is installed, it allows slots for two PCI expansion cards.
1.6.1 Configuring an expansion card
After physically installing the expansion card, configure the card by
adjusting the software settings.
1. Turn on the system and change the necessary BIOS settings, if any.
See Chapter 2 for information on BIOS setup.
2. Assign an IRQ to the card. Refer to the tables below.
3. Install the software drivers for the expansion card.
1.6.2 Standard Interrupt Assignments
IRQ Standard Function
0 System Timer
1 Keyboard Controller
2 Programmable Interrupt Controller
3 USB Universal Host Controller
4 Communications Port (COM1)
5 USB Universal Host Controller
6 Standard Floppy Disk Controller
7 Printer Port (LPT1)
8 System CMOS/Real Time Clock
9 Generic Cardbus Controller
10 ACPI IRQ Holder for PCI IRQ Steering
11 ACPI IRQ Holder for PCI IRQ Steering
12 PS/2 Compatible Mouse Port
13 Numeric Data Processor
14 Ultra ATA Controller
15 Secondary Ultra ATA Controller
*These IRQs are usually available for ISA or PCI devices.