Appendix C
IRQ and I/O Port Address
The factory-set interrupt requests and I/O port addresses are listed below. Find an appropriate one to install an optional
device.
Interrupt Request
The factory-set IRQs are assigned as follows:
IRQ Peripheral Device (Controller) IRQ Peripheral Device (Controller)
0 System timer 8 Real-time clock
1 Keyboard 9 PCI/SCI
2 Cascaded connection 10 PCI
3 COM B serial port (PCI) 11 BMCIRQ/PCI
4 COM A serial port (PCI) 12 Mouse
5 PCI/LPT2 parallel port 13 Numeric processor
6 Floppy disk 14 Primary IDE (CD-ROM drive)
7 LPT1 parallel port 15 PCI
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