Lenovo NetVista X40 Technical information manual for NetVista 2179 and 6643 ma - Page 41

Appendix B. System address maps, System memory map

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Appendix B. System address maps System memory map The first 640 KB of system board RAM is mapped starting at address hex 0000000. A 256 byte area and a 1 KB area of this RAM are reserved for BIOS data areas. Memory can be mapped differently if POST detects an error. Table 32. System memory map Address range (decimal) Address range (hex) 0-512 KB 00000-7FFFF 512-639 KB 80000-9FBFF 639-640 KB 9FC00-9FFFF 640-767 KB A0000-BFFFF 768-800 KB 800-896 KB C0000-C7FFFF C8000-DFFFF 896 KB-1 MB E0000-FFFFF 1-16 MB 16-4096 MB 4096-4120 MB 100000-FFFFFF 1000000-FFDFFFF FFFE0000-FFFFFFFF Size 512 KB 127 KB 1 KB 128 KB 32 KB 96 KB 128 KB 15 MB 4080 MB 128 KB Description Conventional Extended conventional Extended BIOS data Dynamic video memory display cache Video ROM BIOS (shadowed) PCI space, available to adapter ROMs System ROM BIOS (main memory shadowed) PCI space PCI space (positive decode) System ROM BIOS © Copyright IBM Corp. 2000 33

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© Copyright IBM Corp.
2000
33
Appendix B.
System address maps
System memory map
The first 640 KB of system board RAM is mapped starting at address hex 0000000. A
256 byte area and a 1 KB area of this RAM are reserved for BIOS data areas. Memory
can be mapped differently if POST detects an error.
Table 32. System memory map
Address range
(decimal)
Address range (hex)
Size
Description
0–512 KB
00000–7FFFF
512 KB
Conventional
512–639 KB
80000–9FBFF
127 KB
Extended conventional
639–640 KB
9FC00–9FFFF
1 KB
Extended BIOS data
640–767 KB
A0000–BFFFF
128 KB
Dynamic video memory display
cache
768–800 KB
C0000–C7FFFF
32 KB
Video ROM BIOS (shadowed)
800–896 KB
C8000–DFFFF
96 KB
PCI space, available to adapter
ROMs
896 KB–1 MB
E0000–FFFFF
128 KB
System ROM BIOS (main memory
shadowed)
1–16 MB
100000–FFFFFF
15 MB
PCI space
16–4096 MB
1000000–FFDFFFF
4080 MB
PCI space (positive decode)
4096–4120 MB
FFFE0000–FFFFFFFF
128 KB
System ROM BIOS