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2-6-13 IRQs DESCRIPTION FOR VARIOUS DEVICES
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 require IRQs. System IRQs are avail-
able to cards installed in the ISA expansion bus first and then any remain-
ing 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 in-
stall it in any available slot on the ISA bus. To see a map of your used and
free IRQs in Windows 98, please click the My Computer
system, in which you can see the Device Manager tab. Double click on a
specific hardware device to display the Resources tab which shows the
Interrupt number and address. Double-Clicking the first option Computers
of the Device Manager screen to see all the interrupts and addresses for
your system. Make sure that ISA devices should not share IRQ with other
devices; otherwise your computer will get into trouble when those two
devices are used at the same time.
Chapter 2 Hardware Setup
35
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
= Control Panel
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