NEC VERSA FXI, Service And Reference Manual

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Specifications 9-9
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.
System Interrupts
IRQ Device
IRQ00 Internal Timer 1
IRQ01 Keyboard
IRQ02 PIC
IRQ03 Available/IR
IRQ04 Available/Serial
IRQ05 CardBus/Sound/Modem
IRQ06 Diskette Drive
IRQ07 LPT
IRQ08 Real-time Clock
IRQ09 Available
IRQ10 PC CardBus/LAN/Video/USB
IRQ11 Available
IRQ12 PS/2 Mouse
IRQ13 Numeric Data Processor
IRQ14 IDE Controller
IRQ15 Available