Interrupt Controllers - NEC Versa LX User Manual

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.
Controller
Master/Slave
Master
Master
Master
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Master
Master
Master
Master
Master
System Interrupt Controllers
Prio Name Device
rity
0 IRQ00 System Timer 1
1 IRQ01 Keyboard
2 IRQ02 Programmable Controller
3 IRQ08 Real-time Clock
4 IRQ09 Infrared Port
5 IRQ10 USB Port
6 IRQ11 PC Card Bus Controller
7 IRQ12 PS/2 Mouse
8 IRQ13 Math Coprocessor (built into CPU)
9 IRQ14 Hard Disk Controller 1
10 IRQ15 IDE Versa Dock or PC card in Versa Dock
11 IRQ03 Not used, available
12 IRQ04 Serial Port
13 IRQ05 Sound
14 IRQ06 Diskette Drive Controller
15 IRQ07 Parallel Port
Specifications 8-13