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| Category | Description |
|---|---|
| 1 | Serial Device Control |
| 2 | Reserved |
| 3 | Screen/Video control |
| 4 | Keyboard Control |
| 5 | Printer Control |
| 6 | Light Pen Control |
| 7 | Mouse Control |
| 8 | Logical Disk Control |
| 9 | Physical Disk Control |
| 10 | Character Device Monitor Control |
| 11 | General Device Control |