System Support
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| Table |
| System I/O Map |
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|
I/O Port | Function |
0000..001Fh | DMA Controller 1 |
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0020..002Dh | Interrupt Controller 1 |
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002E, 002Fh | Index, Data Ports to SIO Controller (primary) |
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0030..003Dh | Interrupt Controller |
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0040..0042h | Timer 1 |
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004E, 004Fh | Index, Data Ports to SIO Controller (secondary) |
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0050..0052h | Timer / Counter |
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0060..0067h | Microcontroller, NMI Controller (alternating addresses) |
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0070..0077h | RTC Controller |
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0080..0091h | DMA Controller |
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0092h | Port A, Fast A20/Reset Generator |
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0093..009Fh | DMA Controller |
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00A0..00B1h | Interrupt Controller 2 |
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00B2h, 00B3h | APM Control/Status Ports |
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00B4..00BDh | Interrupt Controller |
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00C0..00DFh | DMA Controller 2 |
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00F0h | Coprocessor error register |
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0170..0177h | IDE Controller 2 (active only if standard I/O space is enabled for secondary controller) |
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01F0..01F7h | IDE Controller 1 (active only if standard I/O space is enabled for primary controller) |
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0278..027Fh | Parallel Port (LPT2) |
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02E8..02EFh | Serial Port (COM4) |
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02F8..02FFh | Serial Port (COM2) |
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0370..0377h | Diskette Drive Controller Secondary Address |
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0376h | IDE Controller 2 (active only if standard I/O space is enabled for primary drive) |
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0378..037Fh | Parallel Port (LPT1) |
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03B0..03DFh | Graphics Controller |
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03BC..03BEh | Parallel Port (LPT3) |
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03E8..03EFh | Serial Port (COM3) |
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03F0..03F5h | Diskette Drive Controller Primary Addresses |
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03F6h | IDE Controller 1 (active only if standard I/O space is enabled for sec. drive) |
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03F8..03FFh | Serial Port (COM1) |
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04D0, 04D1h | Interrupt Controller |
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0678..067Fh | Parallel Port (LPT2) |
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0778..077Fh | Parallel Port (LPT1) |
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07BC..07BEh | Parallel Port (LPT3) |
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0CF8h | PCI Configuration Address (dword access only ) |
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0CF9h | Reset Control Register |
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0CFCh | PCI Configuration Data (byte, word, or dword access) |
NOTE:
Assume unmarked gaps are unused, reserved, or used by functions that employ variable I/O address mapping. Some ranges may include reserved addresses.
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