1st MB Memory Address Map
| Memory address |
| Description |
| ||||||
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| System memory |
| ||||||
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| VGA buffer |
| |||||
|
|
| System BIOS |
| ||||||
|
| 1000000- |
| Extend BIOS |
| |||||
| IRQ Mapping Table |
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| |||
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|
|
| |
| IRQ0 |
| System Timer |
| IRQ8 |
| RTC clock | |||
| IRQ1 |
| Keyboard |
| IRQ9 |
| USB2.0 | |||
| IRQ2 |
| Available |
| IRQ10 |
| LAN | |||
| IRQ3 |
| COM2 |
| IRQ11 |
| AUDIO/SMBus Cntrlr | |||
| IRQ4 |
| COM1 |
| IRQ12 |
| PS/2 mouse | |||
| IRQ5 |
| Available |
| IRQ13 |
| FPU | |||
| IRQ6 |
| FDC |
| IRQ14 |
| Primary IDE | |||
| IRQ7 |
| Available |
| IRQ15 |
| Secondary IDE | |||
| DMA Channel Assignments |
|
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| |||||
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| |||
| Channel |
| Function |
|
|
|
| |||
| 0 |
|
| Available |
|
|
|
|
|
|
| 1 |
|
| Available |
|
|
|
|
|
|
| 2 |
|
| Floppy disk |
| |||||
| 3 |
|
| Available |
|
|
|
|
|
|
| 4 |
|
| Cascade for DMA controller 1 |
| |||||
| 5 |
|
| Available |
|
|
|
|
|
|
| 6 |
|
| Available |
|
|
|
|
|
|
| 7 |
|
| Available |
|
|
|
|
|
|
45
