: PX JQWa
BIOS Addresses
Xh a8g h n | :2 |
Peripheral devices, accessory devices and system controllers are accessed via the system I/O space, which is not located in system memory space. The
64KB of addressable I/O space comprises
| Mtup dp®t u | Or |
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0000 | - 000F | DMA controller 1 |
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0020 | - 0021 | Master interrupt controller |
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002E - 002F |
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0040 | - 0043 | Timer 1 |
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0060, 0064 | Keyboard controller (reset, slow A20) | |
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0061 |
| Port B (speaker, NMI status and control) |
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0070 |
| Bit 7: NMI mask register |
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0070 | - 0071 | RTC and CMOS |
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0080 |
| Manufacturing port (POST card) |
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0081 | - 0083, |
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008F |
| DMA controller |
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0092 |
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00A0 - 00A1 | Slave interrupt controller | |
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00C0 - 00DF | DMA controller 2 | |
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00F0 - 00FF | ||
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0130 | - 013F |
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0170 | - 0177 | ICH (82801AA) bus master IDE controller |
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01F0 - 01F7 | IDE primary channel | |
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0200 |
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0220 | - 0232 |
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0278 | - 027F |
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02E8 - 02EF |
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02F8 - 02FF | Serial port 2 (COM2) | |
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0330 | - 0331 |
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0372 | - 0377 |
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0378 | - 037A | LPT1 |
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1.If configured.
103