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Table 51.
System I/O Addresses (continued)
Address(es)
03C0h - 03CFh
03D4h - 03DAh
03E8h - 03EFh
03F0h - 03F5h
03F6h - 03F7h
03F8h - 03FFh
0400h - 043Fh
04D0h - 04D1h
0678h - 067Ah
0778h - 077Ah
07BCh - 07BEh
0CA0 - CA3h
0CF8h
0CF9h
0CFCh
46E8h
Memory Map
Table 52.
Memory Map
Address Range (hex)
0 to 07FFFFh
0A0000h to 0BFFFFh
0C0000h and 0DFFFFh
0E0000h to 0FFFFFh
0E0000h to 0EFFFFh
FC000000h to FFFFFFFFh
156
Resource
Video Display Controller
Color Graphics Controller
Serial Port A
Diskette Controller
Primary IDE - Sec. Diskette
Serial Port A (Primary)
DMA Controller 1, Extended Mode
Registers
Interrupt Controllers 1 and 2 Control
Register
Parallel Port (ECP)
Parallel Port (ECP)
Parallel Port (ECP)
BMC Registers
PCI CONFIG_ADDRESS Register
NBX Turbo and Reset control
PCI CONFIG_DATA Register
Video Display Controller
Amount
640 KB
128 KB
128 KB
128 KB
2 MB
64 MB
Device
Notes
PIIX4E
Located in 450NX
PIIX4E
Located in 450NX
Function
DOS region, base system memory
Video or SMM memory
Add-in board BIOS and buffer area
System BIOS
Extended system BIOS
PCI memory space
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