Intel MB440LX manual Memory Regions, DOS Compatibility Region, Extended Memory Region

Memory Regions

The memory module supports from 16 MB to 1 GB of ECC memory by using fast page mode (FPM) or extended data out (EDO) 64 Mbit DRAMs mounted on JEDEC 3.3 V 60 ns DIMMs.

DOS Compatibility Region

The DOS compatibility region covers 1 MB of memory from addresses 0000_0000h to 000F_FFFFh.

Address Range (hex)	Amount	Function
0000_0000h–0007_FFFFh	512 KB	DOS region, base system memory (fixed)
0008_0000h–0009_FFFFh	128 KB	ISA window memory
000A_0000h–000B_FFFFh	128 KB	PCI/ISA Video or SMM
000C_0000h–000D_FFFFh	128 KB	Add-in card BIOS and buffer area
000E_0000h–00EF_FFFFh	64 KB	Extended system BIOS
000F_0000h–000F_FFFFh	64 KB	System BIOS

Extended Memory Region

The extended memory region covers 4 GB of memory from addresses 010_0000h to FFFF_FFFFh.

Address Range (hex)	Amount	Function
0100_0000h–3FFF_FFFFh	1 GB	Local DRAM space
3FFF_0000h–FFFF_FFFFh	3 GB	PCI memory space

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