Asus P8B-M User Guide - Page 36
Interrupt assignments, PCI Express x8 slots x4 link, PCI Express x16 slot x16 link, PCI slot - cpu support
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2.5.3 Interrupt assignments Standard Interrupt assignments IRQ Priority Standard function 0 1 System Timer 1 2 Keyboard Controller 2 - Programmable Interrupt 3* 11 Communications Port (COM2) 4* 12 Communications Port (COM1) 5* 13 -- 6 14 Floppy Disk Controller 7* 15 -- 8 3 System CMOS/Real Time Clock 9* 4 ACPI Mode when used 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. 2.5.4 PCI Express x8 slots (x4 link) The onboard PCI Express x8 slots provide two x4 link to CPU. The slots support VGA cards and various server class high performance add-on cards. 2.5.5 PCI Express x16 slot (x16 link) The onboard PCI Express x16 slot provides one x16 link to CPU. This slot supports VGA cards and various server class high performance add-on cards. 2.5.6 PCI slot The PCI slot supports cards such as a LAN card, USB card, and other cards that comply with PCI 2.3 specifications. 2-18 Chapter 2: Hardware information