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Memory Space
0F0000h-0FFFFFh
100000h-1FFFFFF
2000000-5FFFFFF
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. Fif-
teen 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 de-
creasing priority.
Controller
Master/Slave Priority Name
Master
Master
Master
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Master
Size
64 KB
32 MB
64 MB
0
IRQ00
1
IRQ01
2
IRQ02
3
IRQ08
4
IRQ09
5
IRQ10
6
IRQ11
7
IRQ12
8
IRQ13
9
IRQ14
10
IRQ15
11
IRQ03
Function
System AMIBIOS (includes Setup
and hard disk drive utilities)
Built-in Extended Memory
Extended Memory
Device
Counter 0/Timer 1
Keyboard
INT output from controller 2
Real-time Clock
Infrared Port
Reserved (CardBus Controllers)
Reserved (CardBus Controllers)
NEC VersaGlide Mouse
Math Coprocessor (built into
CPU)
Hard Disk Controller 1
Reserved (2nd IDE on Docking
Station or CardBus card)
Modem
Specifications B-7
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