Lenovo PC 300GL Technical Information Manual 6272, 6282 - Page 56

Appendix B., System Address Maps

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Appendix B. System Address Maps Appendix B. System Address Maps System Memory Map The first 640 KB of system board RAM is mapped starting at address 0000000h. 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. Figure 49. System Memory Map Address Range (hex) Size 00000000-0007FFFF 512 KB 00080000-0009FBFF 127 KB 0009FC00-0009FFFF 3 KB 000A0000-000BFFFF 128 KB 000C0000-000C7FFF 32 KB 000D8000-000DFFFF 96 KB 000E0000-000FFFFF 128 KB 00100000-00FFFFFF 15 MB 01000000-07FFFFFF 111 MB 08000000-72FFFFFF 1712 MB 73000000-76FFFFFF 64 MB 77000000-FFFDFFFF 2191.9 MB FFFE0000-FFFFFFFF 128 KB Description Conventional Extended conventional Extended BIOS data Video RAM Video ROM BIOS (shadowed) ISA/PCI space; available to ISA adapter ROMs System ROM BIOS (ISA bus, shadowed) ISA/PCI space PCI space PCI space Video linear frame buffer PCI space System ROM BIOS (ISA bus) 44 Technical Information Manual

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Appendix B.
System Address Maps
Appendix B.
System Address Maps
System Memory Map
The first 640 KB of system board RAM is mapped starting at address 0000000h.
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.
Figure 49. System Memory Map
Address Range (hex)
Size
Description
00000000–0007FFFF
512 KB
Conventional
00080000–0009FBFF
127 KB
Extended conventional
0009FC00–0009FFFF
3 KB
Extended BIOS data
000A0000–000BFFFF
128 KB
Video RAM
000C0000–000C7FFF
32 KB
Video ROM BIOS (shadowed)
000D8000–000DFFFF
96 KB
ISA/PCI space; available to ISA adapter ROMs
000E0000–000FFFFF
128 KB
System ROM BIOS (ISA bus, shadowed)
00100000–00FFFFFF
15 MB
ISA/PCI space
01000000–07FFFFFF
111 MB
PCI space
08000000–72FFFFFF
1712 MB
PCI space
73000000–76FFFFFF
64 MB
Video linear frame buffer
77000000–FFFDFFFF
2191.9 MB
PCI space
FFFE0000–FFFFFFFF
128 KB
System ROM BIOS (ISA bus)
44
Technical Information Manual