9-14
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.
System Interrupt Controllers
Controller
Master/Slave Priority Name Device
Master 0 IRQ00 System Timer 1
Master 1 IRQ01 Keyboard
Master 2 IRQ02 Programmable Controller
Slave 3 IRQ08 Real-time Clock
Slave 4 IRQ09 USB Port
Slave 5 IRQ10 PC Card Bus Controller/Video (AGP)
Slave 6 IRQ11 VersaBay in Versa Dock
Slave 7 IRQ12 PS/2 Mouse/NEC VersaGlide
Slave 8 IRQ13 Math Coprocessor (built into CPU)
Slave 9 IRQ14 Hard Disk Controller 1
Slave 10 IRQ15 VersaBay III
Master 11 IRQ03 Infrared Port, when enabled
Master 12 IRQ04 Serial Port
Master 13 IRQ05 Sound/PC CardBus Controller (AGP)
Master 14 IRQ06 Diskette Drive Controller
Master 15 IRQ07 Parallel Port
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