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B-8 Specifications
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 Name Device
0 IRQ00 Internal Timer 1
1 IRQ01 Keyboard
2IRQ02 PIC
3 IRQ08 Real-time Clock
4 IRQ09 SCI, CardBus, Modem, LAN
5 IRQ10 Video
6 IRQ11 Sound
7 IRQ12 Mouse
8 IRQ13 Coprocessor
9 IRQ14 IDE Controller
10 IRQ15 (Free)
11 IRQ03 or IRQ04 (Free) Infrared Port
1
12 IRQ04 or IRQ03 (Free)
13 IRQ05 or IRQ09 USB
14 IRQ06 (Free)
15 IRQ07 (Free)
1
When enabled.