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