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Hardware Emergency Room:   I/O Ports
Contents: Typical I/O Port Assignments

Typical I/O Port Assignments
 
Hex Address Motherboard and Chip Set Port Addresses
000-000F Chip set 8237 - DMA 1
0020-0021 Chip set 8259 Programmable interrupt controller IC #1
002E-002F Super I/O Controller configuration registers
0040-0043 Chip set  System Timer IC #1
0048-004B Chip set  System Timer IC #2
0060 Keyboard/mouse controller IC
0061 Chip set NMI, speaker control
0064 Keyboard/mouse controller IC
0070-0071 RTC port and NMI mask port
0078-0079 Reserved
0080-008F Chip set DMA page registers
00A0-00A1 Chip set 8259 Programmable interrupt controller IC #2
00B2 APM control port
00B3 APM status port
00C0-00DE Chip set 8237 - DMA 2
00F0 Math coprocessor reset numeric error
Hex Address Bus-Based Device Port Addresses
0130-0133 Adaptec SCSI adapter (alternate)
0134-0137 Adaptec SCSI adapter (alternate)
0168-016F Fourth IDE interface
0170-0177 Secondary IDE interface
01E8-01EF Third IDE interface
01F0-01F7 Primary IDE / AT hard disk controller
0200-0207 Game port or joystick adapter
0210-0217 IBM XT expansion chassis
0220-0233 Creative labs sound blaster 16 audio (default)
0230-0233 Adaptec SCSI adapter (alternate)
0234-0237 Adaptec SCSI adapter (alternate)
0238-023B MS bus mouse (alternate)
023C-023F MS bus  mouse (default)
0240-024F SMC Ethernet adapter (default)
0240-0253 Creative labs sound blaster 16 audio (alternative)
0258-025F Intel above board
0260-026F SMC Ethernet adapter (alternate)
0260-0273 Creative labs sound blaster 16 audio (alternate)
0270-0273 Plug and play I/O read ports
0278-027F Parallel port 2 (LPT2)
0280-028F SMC Ethernet adapter (alternate)
0280-0293 Creative labs sound blaster 16 audio (alternate)
02A0-02AF SMC Ethernet adapter (alternate)
02C0-02CF SMC Ethernet adapter (alternate)
02E0-02EF SMC Ethernet adapter (alternate)
02E8-02EF Serial port 4 (COM4)
02EC-02EF Video, 8514 or ATI standard ports
02F8-02FF Serial port 2 (COM2)
0300-0301 MPU-401 MIDI port (secondary)
0300-030F SMC Ethernet adapter (alternate)
0320-0323 XT hard disk controller
0320-032F SMC Ethernet adapter (alternate)
0330-0331 MPU-401 MIDI port (secondary)
0330-0333 Adaptec SCSI adapter (default)
0334-0337 Adaptec SCSI adapter (alternate)
0340-034F SMC Ethernet adapter (alternate)
0360-036F SMC Ethernet adapter (alternate)
0366 Fourth IDE command port
0367 Fourth IDE status port
0370-0375 Secondary floppy controller
0376 Secondary IDE command port
0377 Secondary IDE status port/floppy controller
0378-037F Parallel port 1 (LPT1)
0380-038F SMC Ethernet adapter (alternate)
0388-038B Audio - FM synthesizer
03B0-03BB Video, Monochrome/EGA/VGA standard ports
03BC-03BF Parallel port 1 (LPT1) or Parallel port 3 (LPT3)
03C0-03CF Video and EGA/VGA standard ports
03D0-03DF Video and CGA/EGA/VGA standard ports
03E6 Third IDE command port
03E7 Third IDE status port
30E8-03EF Serial port 3 (COM3)
03F0-30F7 Primary floppy disk controller ports
03F8-03FF Serial port 1 (COM1)
04D0-04D1 Edge/level triggered PI interrupt controller
0530-0537 Windows sound system (default)
0604-060B Windows sound system (alternate)
0678-067F LPT2 in ECP mode
0778-077F LPT1 in ECP mode
0A20-0A23 IBM token ring adapter (default)
0A24-0A27 IBM token ring adapter (alternate)
0CF8-0CFB PCI configuration address registers
0CF9 Turbo and reset control register
0CFC-0CFF PCI configuration data registers
FF00-FF07 IDE bus master registers
FF80-FF9F Universal serial bus
FFA0-FFA7 Primary bus master IDE registers
FFA8-FFAF Secondary bus master IDE registers
 
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Disclaimer:  These pages are provided for information purposes only.  We cannot be held responsible for any damage you might inflict on your system while using the information contained herein.  We recommend you always refer any technical matter that is "over your head" to a qualified computer technician.
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2011 Double-Hammer Computer Services.  All rights reserved.
Last Updated: September 04, 2011

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