5HP BIOS BIOS Addresses
HP I/O Port Map (I/O Addresses Used by the System1)
Peripheral devices, accessory devices and system controllers are accessed via the system I/O space, which is not located in system memory space. The 64 KB of addressable I/O space comprises
| Default Values for | Function |
| I/O Address Ports | |
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| |
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0000 | - 0CF7 | DMA controller 1 |
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0020 | - 0021 | Master interrupt controller (8259) |
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| |
002E - 002F | Super I/O | |
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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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|
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0070 | - 0071 | RTC and CMOS |
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0080 |
| Manufacturing port (POST card) |
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0081 | - 0083, 008F | DMA low page register |
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0092 |
| PS/2 reset and Fast A20 |
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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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0170 | - 0177 | Free (IDE secondary channel) |
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01F0 - 01F7 | IDE primary channel | |
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0278 | - 027F | LPT 2 |
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02E8 - 02EF | Serial port 4 (COM4) | |
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02F8 - 02FF | Serial port 2 (COM2) | |
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0372 | - 0377 | Free (IDE secondary channel, secondary floppy disk drive) |
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0378 | - 037F | LPT1 |
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03B0 - 03DF | VGA | |
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03E8 - 03EF | COM3 | |
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03F0 - 03F5 | Floppy disk drive controller | |
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03F6 |
| IDE primary channel |
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03F7 |
| Floppy disk drive controller |
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1.If configured.
92