System IO Address Map
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| I/O address (hex) | System function (shipping configuration) |
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| 000 | - 00F | DMA controller no. 1 |
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| 010 | - 01F | Unused |
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| 020 | - 021 | Interrupt controller no. 1 |
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| 022 | - 024 | Opti chipset configuration registers |
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| 025 | - 03F | Unused |
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| 02E - 02F | 87334 "Super I/O" configuration for CPU |
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| 040 | - 05F | Counter/timer registers |
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| 044 | - 05F | Unused |
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| 060 |
| Keyboard controller |
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| 061 |
| Port B |
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| 062 | - 063 | Unused |
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| 064 |
| Keyboard controller |
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| 065 | - 06F | Unused |
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| 070 | - 071 | NMI enable/RTC |
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| 072 | - 07F | Unused |
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| 080 | - 08F | DMA page registers |
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| 090 | - 091 | Unused |
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| 092 |
| Port A |
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| 093 | - 09F | Unused |
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| 0A0 - 0A1 | Interrupt controller no. 2 |
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| I/O Address (hex) | System function (shipping configuration) |
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| 0A2 - 0BF | Unused |
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| 0C0 - 0DF | DMA controller no. 2 |
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| 0E0 - 0EF | Unused |
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| 0F0 - 0F1 | Coprocessor busy clear/reset |
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| 0F2 - 0FF | Unused |
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| 100 | - 16F | Unused |
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| 170 | - 177 | Secondary fixed disk controller |
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| 178 | - 1EF | Unused |
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| 1F0 - 1F7 | Primary fixed disk controller |
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| 1F8 - 200 | Unused |
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| 201 |
| JoyStick (decoded in ESS1688) |
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| 202 | - 21F | Unused |
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Hardware Specifications and Configurations |
