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Functional Description
4
1. The WatchDog timer and LM78 are normally disabled but may be relocated and enabled via PCI
configuration.
2. These ports are available if the listed function is not enabled in the BIOS.
3. This is an alternate range that may be selected in the BIOS setup.
Memory address mapping
PCI system memory and I/O are configured or enumerated dynamically each
time the system boots or by an operating system (Plug and Play), but there are
legacy memory locations that remain constant.
Refer to Table 4-4 for memory address information.
Address Range
000000H-09FFFFH
0A0000H-0BFFFFH
0C0000H-0C7FFFH
0C8000H-0DFFFH
0E0000H-0EFFFFH
0F0000H-0FFFFFH
4-6
Table 4-3.
I/O addresses (Continued)
Address
3
0678-067A
Parallel port 2 (opt)
3
0778-077A
Parallel port 1 (opt)
3
07BC-07BE
Parallel port 3 (opt)
0CF8-0Cff
PCI configuration
Table 4-4.
640 KB conventional RAM
VGA DRAM (typically on the PCI backplane)
VGA ROM (typically on the PCI backplane)
Expansion ROM
System BIOS extensions
AMI system BIOS
Function
Memory address
Function
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