C-2 IRQ and I/O Port Addresses

Interrupt Requests

The factory-set interrupt requests (IRQs) are listed below.

IRQ Peripheral Device (Controller) IRQ Peripheral Device (Controller)
0 System timer 12 Mouse
1 Keyboard 13 Numeric processor
2 14 Primary IDE
3 COM2 serial port (PCI) 15 Secondary IDE
4 COM1 serial port (PCI) 16 USB
5PCI 17VGA
6 Floppy disk drive 18
7 PCI 19 USB
8 Real-time clock 30 LAN1
9 ACPI compliant system 31 LAN2
10 PCI 49 Adaptec SCSI
11 PCI 50 Adaptec SCSI
PIRQ and PCI Device

The factory-set PCI device interrupts are assigned as follows. Use the BIOS setup

utility, BIOS, for interrupt setup.

Menu Option Interrupt
PCI IRQ 1 On-board SCSI (Channel 0), PCI slot #6 (INT D)
PCI IRQ 2 On-board SCSI (Channel 1), PCI slot #6 (INT C)
PCI IRQ 3 On-board LAN #1
PCI IRQ 4 On-board LAN #2
PCI IRQ 5 On-board GA
PCI IRQ 6 PCI slot #3 (INT A)
PCI IRQ 7 PCI slot #4 (INT A)
PCI IRQ 8 PCI slot #6 (INT A)
PCI IRQ 9 PCI slot #2 (INT A)
PCI IRQ 10 PCI slot #5 (INT A)
PCI IRQ 11 PCI slot #1 (INT A)
PCI IRQ 12 PCI slot #1 (INT D), PCI slot #2 (INT B), PCI slot #3 (INT B),
PCI slot #4 (INT C), PCI slot #5 (INT C)
PCI IRQ 13 PCI slot #1 (INT B), PCI slot #2 (INT C), PCI slot #3 (INT C),
PCI slot #4 (INT D), PCI slot #5 (INT D), PCI slot #6 (INT B)
PCI IRQ 14 PCI slot #1 (INT C), PCI slot #2 (INT D), PCI slot #3 (INT D),
PCI slot #4 (INT B), PCI slot #5 (INT B)