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 9 ā
1 Keyboard 10 PCI
2ā 11PCI
3 COM B 12 Mouse
4 COM A 13 Numeric coprocessor
5 PCI 14 Primary IDE
6 Floppy disk 15 Secondary IDE
7 Parallel 16 USB
8 Real-time clock
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