41
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
Free
13
IRQ 6
Floppy Disk Controller
14
IRQ 7
Parallel Port (LPT1)
15
IRQ 8
Real Time Clock (RTC)
3
IRQ 9
Free
4
IRQ 10
Free
5
IRQ 11
Free
6
IRQ 12
PS/2 Mouse Port
7
IRQ 13
Coprocessor
8
IRQ 14
Primary IDE Channel
9
IRQ 15
Secondary IDE Channel
10
2-10 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 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 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
Sys-
tem
icon, which gives you a
Device Manager
tab. Double-Clicking on a
specific hardware device gives you a
Resources
tab which shows the In-
terrupt number and address. Double-Clicking
Computers
to see all the in-
terrupts 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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