
System Address Map
R
Figure 4. DOS Compatible Area Address Map
| 0C0000h | |
Standard PCI/ISA | 0B8000h | |
| ||
Video Memory | 0B0000h | |
(SMM Memory) | ||
| ||
| 0A0000h |
Upper, Lower,
Expansion Card BIOS
and Buffer Area
Monochrome Display
Adapter Space
1 MB
| Controlled by |
| PAM[6:0] |
768 KB |
|
736 KB | Controlled by |
| VGA Enable and |
704 KB | MDA Enable |
| |
640 KB |
|
= Optional AGP
= Optional System Memory
= System Memory
sys_addr_map_2
Figure 5. Extended Memory Range Address Map
|
|
| 1_0000_0000 (4 GB) | ||
| High BIOS, Optional |
| |||
|
|
|
|
| |
| extended SMRAM |
|
|
|
|
|
|
| FF00_0000 | ||
| Hub Interface |
| |||
|
|
|
|
| |
| (always) |
| FEF0_0000 | ||
|
|
| |||
| Local APIC Space |
| |||
|
|
|
|
| |
|
|
| FEE0_0000 | ||
| Hub Interface |
| |||
|
|
|
|
| |
| (always) |
|
|
|
|
|
|
| FED0_0000 | ||
| I/O APIC Space |
| |||
|
|
|
|
| |
|
|
| FEC8_0000 | ||
| I/O APIC Space |
| |||
|
|
|
|
| |
|
|
| FEC0_0000 | ||
| AGP/PCI |
| |||
|
|
|
|
| |
|
|
| Top of Low Memory (TOM) | ||
| Extended SMRAM |
| |||
|
|
|
|
| |
| Space |
| TEM - TSEG | ||
|
|
| |||
|
|
| 100C_0000 | ||
| Extended SMRAM |
| |||
|
|
|
|
| |
| (translated to < 1 MB) |
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|
|
|
|
| 100A_0000 | ||
|
|
| |||
|
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| 0100_0000 (16 MB) | ||
| ISA Hole |
| |||
|
|
|
| = System Memory Region | |
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|
| ||
|
|
| 00F0_0000 (15 MB) |
|
|
|
|
|
|
| = Optional System Memory Region |
|
|
|
|
| |
|
|
| 0010_0000 (1 MB) |
|
|
|
|
| |||
|
|
|
|
| sys_addr_map_3 |
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|
98 | Intel® 82845 MCH for SDR Datasheet |