Appendix B. System Address Maps
Appendix B. System Address Maps
System Memory Map
Memory can be mapped differently if POST detects an error.
Table 50. System Memory Map (Fixed Address Ranges)
Address Range (Dec) Address Range (Hex) Size Description
0–511 KB 00000–7FFFF 512 KB Conventional
512 KB–638 KB 80000–9FBFF 127 KB Extended conventional
639 KB 9FC00–9FFFF 1 KB Extended BIOS data (moveable
by HIMEM, QEMM, 386MAX)
640 KB–767 KB A0000–BFFF 128 KB Video RAM
768 KB–799 KB C0000–C7FFF 32 KB Video ROM BIOS (shadowed)
800 KB–895 KB C8000–DFFFF 96 KB PCI/ISA space – available to ISA
adapter ROMs
896 KB–1 MB E0000–EFFFF
F0000–FFFFF
128 KB System POST only - available
after boot
ROM BIOS
1 MB–16 MB 100000–FFFFFF 15 MB PCI/ISA space
16 MB–4095.872 MB 1000000–FFFDFFFF 4079.9 MB PCI space (positive decode)
4095.872 MB–4096 (4 GB) FFFE0000–FFFFFFFF 128 KB System ROM BIOS (ISA bus)
Copyright IBM Corp. 1997 53
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