![](/images/new-backgrounds/1264811/26481175x1.webp)
System I/O Address Specifications
| I/O address (hex) | System function (shipping configuration) | |
220 |
| - 22F | Entertainment audio |
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230 |
| - 26D | Unused |
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26E | - 26 | Unused | |
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278 |
| - 27F | Unused |
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280 |
| - 2AB | Unused |
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2A0 | - 2A7 | Unused | |
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2A8 | - 2E7 | Unused | |
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2E8 | - 2EF | Reserved serial port | |
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2F0 - 2F7 | Unused | ||
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2F8 - 2FF | Infrared port | ||
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300 |
| - 31F | Unused |
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320 |
| - 36F | Unused |
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370 |
| - 377 | Secondary diskette drive controller |
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378 |
| - 37F | Parallel port (LPT1/default) |
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380 |
| - 387 | Unused |
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388 |
| - 38B | FM |
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38C - 3AF | Unused | ||
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3B0 | - 3BB | VGA | |
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3BC - 3BF | Reserved (parallel port/no EPP support) | ||
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3C0 - 3DF | VGA | ||
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3E0 | - 3E1 | ExpressCard controller in CPU | |
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3E2 | - 3E3 | Unused | |
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3E8 | - 3EF | Internal modem | |
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3F0 - 3F7 | "A" diskette controller | ||
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3F8 - 3FF | Serial port (COM1/default) | ||
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CF8 - CFB | PCI configuration index register | ||
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CFC - CFF | PCI configuration data register | ||
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Hardware Specifications and Configurations |