92
Memory Address
Range
Size
Description
16.384M –
1048.576M
01000000 – 3FFFFFFF
1032.192M
Maximum allowable memory
1G – (4G – 20M)
04000000 – FEBFFFFF
(3G – 20M)
PCI/AGP memory
(4G – 20M) –
(4G – 19M)
FEC00000 – FECFFFFF
1024K
APIC configuration space
(4G – 19M) –
(4G –18M)
FED00000 – FEDFFFFF
1025K
PCI/AGP memory
(4G – 18M) –
(4G – 17M)
FEE00000 – FEEFFFFF
1024K
APIC configuration space
(4G – 17M) –
(4G – 2M)
FEF00000 – FFDFFFFF
15M
PCI/AGP memory
(4G – 2M) – 4G
FFE00000 – FFFFFFFF
2M
High system BIOS
Using System Resources
Most ISA devices installed in the system require you to reserve an IRQ. PCI devices also need to
use an IRQ, but since they share system resources they can use the same IRQ. At least one IRQ
must be left unassigned, for use with any PCI devices installed in your system.
The system has a limited number of open IRQs. To install more ISA devices than you have open
IRQs, you must disable one unused system port for each excess ISA device, unless the device does
not require an IRQ.
To reserve an IRQ for an installed device:
1.
Restart the system and start the BIOS Setup program.
2.
On the PCI/PnP screen, select the IRQ you want to reserve.
3.
Change the setting for the selected IRQ to
ISA/EISA
.
4.
Save the changes and exit from the BIOS Setup program.
The system’s PCI expansion slots comply with the PCI 2.1 specification. Devices that comply
with the PCI 2.1 specification are fully plug-and-play. You do not have to configure them after
installation.
Some older PCI device drivers cannot share an interrupt, which is a violation of the PCI 2.1
specification. If you install a device that uses such a driver, you must free an IRQ for the device to
work in the system.
