90 Reference Data
Memory map
Interrupts
The following table suggests a logical mapping of interrupt sources. It reflects
a typical configuration, but you can change these interrupts. Use the
information to determine how to program each interrupt. The actual interrupt
map is defined using configuration registers in the I/O controller. I/O
Redirection Registers in the I/O APIC are provided for each interrupt signal.
The signals define hardware interrupt signal characteristics for APIC messages
sent to local APIC(s).
Address Range
(decimal)
Address Range
(hex)
Amount Function
1024 K - 524288 K 100000 - 1FFFFFFF 511 MB Extended memory
960 K - 1024 K F0000 - FFFFF 64 KB Runtime BIOS
896 K - 960 K E0000 - EFFFF 64 KB Reserved
800 K - 896 K C8000 - DFFFF 96 KB Available high DOS memory
(open to the PCI bus)
640 K - 800 K A0000 - C7FFF 160 KB Video memory and BIOS
639 K - 640 K 9FC00 - 9FFFF 1 KB Extended BIOS data (movable by
memory manager software)
512 K - 639 K 80000 - 9FBFF 127 KB Extended conventional memory
0 K - 512 K 00000 - 7FFFF 512 KB Conventional memory
Important If you disable either IDE controller to free the interrupt for
that controller, you must physically unplug the IDE cable
from the system board. Simply disabling the drive by
configuring the BIOS option does not make the interrupt
available.
Interrupt System Resource
NMI I/O channel check
0 Reserved, interval timer
1 Reserved, keyboard buffer full
2 Reserved, cascade interrupt from slave PIC
3COM2*
* This setting is the default, but it can be changed in the BIOS Setup utility.
8506999.book Page 90 Friday, December 15, 2000 8:22 AM
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