5 Desktop Board Resources
Memory Map
Table 34. System Memory Map
Address Range (decimal) | Address Range (hex) | Size | Description | |
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1024 K - 2097152 K | 100000 - 7FFFFFF | 2047 MB | Extended Memory | |
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960 | K - 1024 K | F0000 - FFFFF | 64 KB | Runtime BIOS |
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896 | K - 960 K | E0000 - EFFFF | 64 KB | Reserved |
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800 | K - 896 K | C8000 - DFFFF | 96 KB | Available high DOS memory (open to the |
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| PCI bus) |
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640 K - 800 K | A0000 - C7FFF | 160 KB | Video memory and BIOS | |
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639 | K - 640 K | 9FC00 - 9FFFF | 1 KB | Extended BIOS data (movable by |
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| memory manager software) |
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512 | K - 639 K | 80000 - 9FBFF | 127 KB | Extended conventional memory |
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0 K - 512 K | 00000 - 7FFFF | 512 KB | Conventional memory | |
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DMA Channels
Table 35. DMA Channels
DMA Channel Number | Data Width | System Resource |
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0 | 8 or 16 bits |
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1 | 8 or 16 bits | Parallel port |
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2 | 8 or 16 bits | Floppy 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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