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Interrupt Controllers
Using interrupts, hardware can request software services. If non-Plug and Play software is being
used, the interrupt may need to be moved for software application or driver compatibility. Some
interrupts cannot be moved. Fifteen interrupts can be used with a cascade connection of
8259INTC x 2. The table shows default interrupt level assignments 0 through 15, in order of
decreasing priority.
Priority
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
7-8 Specifications
Name
Device
IRQ00
Internal Timer 1
IRQ01
Keyboard
IRQ02
INT from Controller 2
IRQ08
Real-time Clock
IRQ09
Reserved for ACPI SCI
IRQ10
PC Cardbus/LAN/Video/USB
IRQ11
Available
IRQ12
PS/2 Mouse/NEC VersaGlide
IRQ13
Numeric Data Processor
IRQ14
Hard Disk Controller 1
IRQ15
Not Used
IRQ03 or IRQ04
IRQ04 or IRQ03
Available
IRQ05 or IRQ09
Sound/Modem or PC CardBus
IRQ06
Diskette Drive Controller
IRQ07
Printer Port (LPT1)
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