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2-10 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 freeIRQs 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.
Chapter 2 Hardware Setup
39
Priority
1
2
N/A
11
12
13
14
15
3
4
5
6
7
8
9
10
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