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2-8 IRQ Description
IRQ
Function Description
IRQ 0
System Timer
IRQ 1
Keyboard Controller
IRQ 2
Programmable Interrupt
IRQ 3
Serial Port (COM 2)
IRQ 4
Serial Port (COM 1)
IRQ 5
Free
IRQ 6
Floppy Disk Controller
IRQ 7
Parallel Port (LPT1)
IRQ 8
Real Time Clock (RTC)
IRQ 9
Free
IRQ 10
Free
IRQ 11
Free
IRQ 12
PS/2 Mouse Port
IRQ 13
Coprocessor
IRQ 14
Primary IDE Channel
IRQ 15
Secondary IDE Channel
• 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 shares IRQ with
any other device, your computer will easily get into trouble.
Chapter 2 Hardware Setup
35
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
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