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Appendix B
IRQ and I/O Port Address
The factory-set interrupt requests and I/O port addresses are listed below. Find an appropriate
interrupt request when installing an optional device.
Interrupt Request
The factory-set IRQs are assigned as follows:
IRQ
Peripheral Device (Controller)
0
System timer
1
Keyboard
2
Cascaded connection
3
COM2 serial port (PCI)
4
COM1 serial port (PCI)
5
PCI/LPT2 parallel port (BMC IRQ)
6
Floppy disk
7
LPT1 parallel port
PIRQ and PCI Device
The factory-set PCI device interrupts are assigned as follows. Use the BIOS setup utility, SETUP,
for interrupt setup. See Chapter 3 for details.
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 N), 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)
IRQ
Peripheral Device (Controller)
8
Real-time clock
9
PCI/SCI
10
PCI (BMC IRQ)
11
BMCIRQ/PCI/ISA
12
Mouse
13
Numeric processor
14
Primary IDE (CD-ROM drive)
15
S-IDE
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