Interrupt Controllers - NEC Versa LXi 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
USB Port
PC CardBus Controller/Video
VersaBay in Versa Dock
PS/2 Mouse/NEC VersaGlide
Math Coprocessor (built into CPU)
Hard Disk Controller 1
VersaBay III
Infrared Port, when enabled
Serial Port
Sound/PC CardBus Controller
Diskette Drive Controller
Parallel Port
Specifications 9-11