84
Memory Addresses
Address Range (hex)
Size
Assignment
00000000-0009FBFF
640 KB
System board extension for PnP BIOS
0009FC00-0009FFFF
1 KB
System board extension for PnP BIOS
000A0000-000AFFFF
64 KB
Cirrus Logic 5430/40 PCI
000B0000-000BFFFF
64 KB
Cirrus Logic 5430/40 PCI
000C0000-000C7FFF
32 KB
Unavailable for use by devices
000E0000-000FFFFF
128 KB
System board extension for PnP BIOS
00100000-07FFFFFF
128 MB
System board extension for PnP BIOS
FA800000-FC8FFFFF
32 MB
DEC 21052 PCI to PCI bridge
FB000000-FBFFFFFF
16 MB
Cirrus Logic 5430/40 PCI
FCA00000-FEAFFFFF
33 MB
DEC 21052 PCI to PCI bridge
FEAF8000-FEAFFFFF
32 KB
Standard PCI graphics adapter
FEC00000-FEC00FFF
4 KB
System board extension for PnP BIOS
FEE00000-FEE00FFF
4 KB
System board extension for PnP BIOS
FFFE0000-FFFFFFFF
128 KB
System board extension for PnP 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.
