![background image](http://html1.mh-extra.com/html/ibase-technology/mbn500/mbn500_user-manual_3309022040.webp)
APPENDIX
40
MBN500 Series User’s Manual
B. Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the
service required. The following table shows the IRQ used by the devices
on board.
Level
Function
IRQ 0
System timer
IRQ 3
Communications Port (COM2)
IRQ 4
Communications Port (COM1)
IRQ 8
High precision event timer
IRQ 13
Numeric data processor
IRQ 18
Standard Enhanced PCI to USB Host Controller
IRQ 18
Standard Enhanced PCI to USB Host Controller
IRQ 19
AMD SATA Controller
IRQ81
Microsoft ACPI-Compliant System
IRQ82
Microsoft ACPI-Compliant System
IRQ83
Microsoft ACPI-Compliant System
IRQ84
Microsoft ACPI-Compliant System