I/O – Map
Certain I/O addresses are subject to change during boot as PnP managers may relocate devices or functions. The addresses shown in the table are typical locations.
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| I/O Port | Description | Note |
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| Direct memory access controller |
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| Motherboard resources |
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| Programmable interrupt controller |
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| Motherboard resources |
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| System timer |
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| Motherboard resources |
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| Standard |
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| System speaker |
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| Motherboard resources |
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| Standard |
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| Motherboard resources |
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| System CMOS/real time clock |
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| Motherboard resources |
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| Motherboard resources |
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| Direct memory access controller |
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| Motherboard resources |
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| Direct memory access controller |
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| Motherboard resources |
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| Direct memory access controller |
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| Motherboard resources |
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| Direct memory access controller |
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| Motherboard resources |
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| Programmable interrupt controller |
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| Motherboard resources |
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| Direct memory access controller |
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| Direct memory access controller |
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| Motherboard resources |
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| Numeric data processor |
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| Secondary Ultra ATA Controller |
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| Intel(R) 82801BA Ultra ATA Storage Controller - 244B |
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| Primary Ultra ATA Controller |
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| Intel(R) 82801BA Ultra ATA Storage Controller - 244B |
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| Communications Port (COM2) |
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| Secondary Ultra ATA Controller |
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| Intel(R) 82801BA Ultra ATA Storage Controller - 244B |
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| Printer Port (LPT1) |
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| Intel(R) 82815 Graphics Controller |
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