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Chapter 2 Hardware Setup
IRQ 0 System Timer 1
IRQ Function Description Priority
IRQ 1 Keyboard Controller 2
IRQ 2 Programmable Interrupt N/A
IRQ 3 Serial Port (COM 2) 11
IRQ 4 Serial Port (COM 1) 12
IRQ 5 13
IRQ 6 Floppy Disk Controller 14
IRQ 7 Parallel Port (LPT1) 15
IRQ 8 Real Time Clock (RTC) 3
IRQ 9 4
IRQ 10 5
IRQ 11 6
IRQ 12 PS/2 Mouse Port 7
IRQ 13 Coprocessor 8
IRQ 14 Primary IDE Channel 9
IRQ 15 Secondary IDE Channel 10
2-8 IRQ Description
• Both ISA and PCI expansion cards may require IRQs. System IRQs are
available to cards installed in the ISA expansion bus first, then any
remaining IRQs are available to PCI cards. Currently, there are two types
of ISA cards.
• The original ISA expansion card design, now referred to as “Legacy” ISA
card, requires you to configure the card’s jumpers manually and then
install it in any available slot on the ISA bus. To see a map of your used
and free IRQs in Windows 98, the Control Panel in My Computer, contains a
System icon, which gives you a Device Manager tab. Double-Clicking on
a specific hardware device gives you a Resources tab which shows the
Interrupt number and address. Double-Clicking Computers to see all the
interrupts and addresses for your system. Make sure that each ISA device
should be assigned to one IRQ respectively. If ISA device share IRQ with
any other device, your computer will easily get into trouble.
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