Technical Reference
2.2.2Memory Map
Table 11 lists the system memory map.
Table 11. System Memory Map
Address Range (decimal) | Address Range (hex) | Size | Description |
|
|
|
|
1024 K - 4194304 K | 100000 - FFFFFFFF | 4095 MB | Extended memory |
|
|
|
|
960 K - 1024 K | F0000 - FFFFF | 64 KB | Runtime BIOS |
|
|
|
|
896 K - 960 K | E0000 - EFFFF | 64 KB | Reserved |
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|
|
|
800 K - 896 K | C8000 - DFFFF | 96 KB | Potential available high DOS |
|
|
| memory (open to the PCI |
|
|
| Conventional bus). Dependent on |
|
|
| video adapter used. |
|
|
|
|
640 K - 800 K | A0000 - C7FFF | 160 KB | Video memory and BIOS |
|
|
|
|
639 K - 640 K | 9FC00 - 9FFFF | 1 KB | Extended BIOS data (movable by |
|
|
| memory manager software) |
|
|
|
|
512 K - 639 K | 80000 - 9FBFF | 127 KB | Extended conventional memory |
|
|
|
|
0 K - 512 K | 00000 - 7FFFF | 512 KB | Conventional memory |
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|
|
|
2.3 DMA Channels
Table 12. DMA Channels
DMA Channel Number | Data Width | System Resource |
|
|
|
0 | 8 or 16 bits | Open |
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|
|
1 | 8 or 16 bits | Parallel port |
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|
|
2 | 8 or 16 bits | Diskette drive |
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|
|
3 | 8 or 16 bits | Parallel port (for ECP or EPP) |
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|
|
4 | 8 or 16 bits | DMA controller |
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|
|
5 | 16 bits | Open |
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|
|
6 | 16 bits | Open |
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|
|
7 | 16 bits | Open |
|
|
|
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