B-10 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 SystemTimer 1
Master 1 IRQ01 Keyboard
Master 2 IRQ02 Programmable Controller
Slave 3 IRQ08 Real-time Clock
Slave 4 IRQ09 Infrared Port
Slave 5 IRQ10 USB Port
Slave 6 IRQ11 PC Card Bus Controller
Slave 7 IRQ12 PS/2 Mouse
Slave 8 IRQ13 Math Coprocessor (built into
CPU)
Slave 9 IRQ14 Hard Disk Controller 1
Slave 10 IRQ15 IDE NEC Versa Dock or PC
card in NEC Versa Dock
Master 11 IRQ03 Not used, available
Master 12 IRQ04 Serial Port
Master 13 IRQ05 Sound
Master 14 IRQ06 Diskette Drive Controller
Master 15 IRQ07 Parallel Port
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