System memory map specifications
Size Memory address System function
640 KB 00000000-0009FFFF Base memory
128 KB 000A0000-000BFFFF Video memory
64 KB 000C0000-000CFFFF Video BIOS
64 MB 000E8000-00FFFFFF System BIOS
01000000-XFFFFFFF Extended memory (based on memory
installed)
(X+1)00000000-FEDFFFFF PCI bus and motherboard resources
64 KB FFFF0000-FFFFFFFF System BIOS
98 Chapter 6 Specifications