6 Technical Information
The PC’s Memory Map
The PC’s Memory Map
Memory Area | Memory Range |
| Hexadecimal | Used By |
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| Address Range |
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Extended Memory: 1 MB to 4 MB |
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Extended memory | 1024 KB upward |
| 01000 to 0F0000 | Windows Applications |
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Conventional Memory: 0 KB to 1024 KB (1 MB) |
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384 KB Reserved | 960 KB to 1024 KB |
| 0F0000 to 010000 | 64 KB BIOS area |
Memory Area |
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896 KB to 960 KB |
| 0E0000 to 0F0000 | 64 KB (available) | |
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| 800 KB to 896 KB |
| 0C8000 to 0E0000 | 96 KB available for |
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| accessory boards |
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| 768 KB to 800 KB |
| 0C0000 to 0C8000 | 32 KB Video BIOS Area |
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| 640 KB to 768 KB |
| 0A0000 to 0C0000 | 128 KB Video Memory Area |
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640 KB Base | 0 KB to 640 KB |
| 09F000 to 0A0000 | Extended BIOS Data Area |
Memory Area |
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| — | User Application Program | |
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| Area |
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| — | |
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| 0500 to 0700 | |
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| 0400 to 04FF | BIOS Data Area |
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| 0000 to 03FF | Interrupt Vector Table |
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