Intel KD875PBZLKPAK10 Product Specification - Page 50
Detailed System Memory Address Map
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Intel Desktop Board D875PBZ Technical Product Specification installed system memory can be used when there is no overlap of system addresses. For example, all of the system address space can be utilized on a system that has 2 GB of installed system memory, AGP aperture set for 256 MB, and the PCI cards are requesting 200 MB of system address space. 4 GB Top of System Address Space FLASH APIC Reserved ~20 MB PCI Memory Range (contains AGP window, AGP aperture, PCI, and ICH ranges) DRAM Range DOS Compatibility Memory Top of usable DRAM (memory visible to the operating system) 1 MB 640 KB 0 MB 0FFFFFH 0F0000H 0EFFFFH 0E0000H 0DFFFFH 0C0000H 0BFFFFH 0A0000H 09FFFFH 00000H Upper BIOS area (64 KB) Lower BIOS area (64 KB; 16 KB x 4) Add-in Card BIOS and Buffer area (128 KB; 16 KB x 8) Standard PCI/ ISA Video Memory (SMM Memory) 128 KB * DOS area (640 KB) 1 MB 960 KB 896 KB 768 KB 640 KB 0 KB * Optionally mapped to the internal AGP OM16106 Figure 15. Detailed System Memory Address Map 50