108
Chapter 4: Technical Reference
Memory Map Address Range
Table 4-22 lists the memory map address ranges and the functions they support.
0678h - 067Ah
Parallel Port (ECP)
0778h - 077Ah
Parallel Port (ECP)
07BCh - 07BEh
Parallel Port (ECP)
0CA0 - CA3h
BMC Registers
0CF8h
PCI CONFIG_ADDRESS
Register
Located in 450NX
0CF9h
NBX Turbo and Reset
control
PIIX4E
0CFCh
PCI CONFIG_DATA
Register
Located in 450NX
46E8h
Video Display Controller
Table 4-22
Memory Map Address Range
Address Range (hex)
Amount
Function
0 to 07FFFFh
640 KB
DOS region, base system memory
0A0000h to 0BFFFFh
128 KB
Video or SMM memory
0C0000h and 0DFFFFh
128 KB
Add-in board BIOS and buffer area
0E0000h to 0FFFFFh
128 KB
System BIOS
0E0000h to 0EFFFFh
2 MB
Extended system BIOS
FC000000h to FFFFFFFFh
64 MB
PCI memory space
Table 4-21 (continued)
System I/O Addresses
Address(es)
Resource
Device
Notes
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