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1-20 Technical Information
Interrupt Controllers
Using interrupts, it is possible to change the system’s code sequence. To change the se-
quence, reassign the interrupt-levels. Fifteen interrupts can be used with a cascade connec-
tion of two 82C59 interrupt controllers.
Interrupt-level assignments 0 through 15 are listed in Table 1-4, in order of decreasing
priority.
Table 1-4 Interrupt Controllers
CONTROLELR
(MASTER/SLAVE)
PRIORITY
NAME
DEVICE
Master
0
IRQ00
System Timer
Master
1
IRQ01
Keyboard
Master
2
IRQ02
Programmable Interrupt Controller
Slave
3
IRQ08
Real-time Clock
Slave
4
IRQ09
Infrared Port
Slave
5
IRQ10
USB Port
Slave
6
IRQ11
PC Card, Video
Slave
7
IRQ12
PS/2 Mouse
Slave
8
IRQ13
Math Coprocessor (built into CPU)
Slave
9
IRQ14
Hard Disk Controller
Slave
10
IRQ15
IDE DS/MD6000 or PC card in MD6000
Master
11
IRQ03
PC Card
Master
12
IRQ04
Serial Port
Master
13
IRQ05
Sound
Master
14
IRQ06
Diskette Drive
Master
15
IRQ07
Parallel Port