A-2 IBM Personal Computer User GuideMemory mapThis table shows the hexadecimal addresses for the system memory regions. Youmay use this information for adapter cards that require you to set up memoryregions.Table 2: Memory mapAddress range Description0~640 KB (000000 ~ 09FFFF) Main memory640~768 KB (0A0000 ~ 0BFFFF) VGA memory768~816 KB (0C0000 ~ CBFFFF) Video BIOS Memory816~896 KB (0CC000 ~ 0DFFFF) ISA Card BIOS & Buffer Memory896~960 KB (0E0000 ~ 0EFFFF) BIOS Extension MemorySetup and Post MemoryPCI Development BIOS960~1024 KB (0F0000 ~ 0FFFFF) System BIOS memory(100000 ~ Upper Limit) Main memory(Upper Limit ~ 4 GB) PCI memoryNote:Upper Limit means the maximum size of installedmemory.The Main Memory Maximum size is 512 MB.
