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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
1
When enabled.
Name
IRQ00
IRQ01
IRQ02
IRQ08
IRQ09
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
IRQ03 or IRQ04
IRQ04 or IRQ03
IRQ05 or IRQ09
IRQ06
IRQ07
Device
Internal Timer 1
Keyboard
INT from Controller 2
Real-time Clock
Reserved for ACPI SCI
PC Cardbus/LAN//Video/USB
Available
PS/2 Mouse/NEC VersaGlide
Numeric Data Processor
Hard Disk Controller 1
Not Used
1
Infrared Port
Available
Sound/Modem//PC CardBus
Diskette Drive Controller
Printer Port (LPT1)
1
Specifications B-9
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