Common I/O Base Address Device Assignments in IBM PC Compatible Computers
This table represents the common I/O address ranges for device assignments in IBM PC compatible computers. The base address is the first in each range. Each row of the table represents a device or chip within the computer system. For example, the address status port in the LPT device is 0x0001, adding the base address of LPT2 (0x0378) results in the address of the LPT2 status port being 0x0379.
When there are two or more identical devices in a computer system, each device would be mapped to a different base address (e.g. LPT2 and LPT3 for printers).
| I/O address range | Device |
|---|---|
| 00 – 1F | First DMA controller 8237 A-5 |
| 20 – 3F | First Programmable Interrupt Controller, 8259A, Master |
| 40 – 5F | Programmable Interval Timer (System Timer), 8254 |
| 60 – 6F | Keyboard, 8042 |
| 70 – 7F | Real Time Clock, NMI mask |
| 80 – 9F | DMA Page Register, 74LS612 |
| 87 | DMA Channel 0 |
| 83 | DMA Channel 1 |
| 81 | DMA Channel 2 |
| 82 | DMA Channel 3 |
| 8B | DMA Channel 5 |
| 89 | DMA Channel 6 |
| 8A | DMA Channel 7 |
| 8F | Refresh |
| A0 – BF | Second Programmable Interrupt Controller, 8259A, Slave |
| C0 – DF | Second DMA controller 8237 A-5 |
| F0 | Clear 80287 Busy |
| F1 | Reset 80287 |
| F8 – FF | Math coprocessor, 80287 |
| F0 – F5 | PCjr Disk Controller |
| F8 – FF | Reserved for future microprocessor extensions |
| 100 – 10F | POS Programmable Option Select (PS/2) |
| 110 – 1EF | System I/O channel |
| 140 – 15F | Secondary SCSI host adapter |
| 170 – 177 | Secondary Parallel ATA Disk Controller |
| 1F0 – 1F7 | Primary Parallel ATA Hard Disk Controller |
| 200 – 20F | Game port |
| 210 – 217 | Expansion Unit |
| 220 – 233 | Sound Blaster and most other sound cards |
| 278 – 27F | LPT3 parallel port |
| 280 – 29F | LCD on Wyse 2108 PC SMC Elite default factory setting |
| 2B0 – 2DF | Alternate Enhanced Graphics Adapter (EGA) display control |
| 2E8 – 2EF | COM4 serial port |
| 2E1 | GPIB/IEEE-488 Adapter 0 |
| 2E2 – 2E3 | Data acquisition |
| 2F8 – 2FF | COM2 serial port |
| 300 – 31F | Prototype Card |
| 300 – 31F | Novell NE1000 compatible Ethernet network interfaces |
| 300 – 31F | AMD Am7990 Ethernet network interface, IRQ=5. |
| 320 – 323 | ST-506 and compatible hard disk drive interface |
| 330 – 331 | MPU-401 MIDI Processing Unit on most sound cards |
| 340 – 35F | Primary SCSI host adapter |
| 370 – 377 | Secondary floppy disk drive controller |
| 378 – 37F | LPT2 parallel port |
| 380 – 38C | Secondary Binary Synchronous Data Link Control (SDLC) adapter |
| 388 – 389 | AdLib Music Synthesizer Card |
| 3A0 – 3A9 | Primary Binary Synchronous Data Link Control (SDLC) adapter |
| 3B0 – 3BB | Monochrome Display Adapter (MDA) display control |
| 3BC – 3BF | MDA LPT1 parallel port |
| 3C0 – 3CF | Enhanced Graphics Adapter (EGA) display control |
| 3D0 – 3DF | Color Graphics Adapter (CGA) |
| 3E8 – 3EF | COM3 serial port |
| 3F0 – 3F7 | Primary floppy disk drive controller. Primary IDE controller (slave drive) (3F6–3F7h) |
| 3F8 – 3FF | COM1 serial port |
| CF8 – CFC | PCI configuration space |
Note: For many devices listed above the assignments can be changed via jumpers, DIP switches, or Plug-And-Play software.
Read more about this topic: Input/output Base Address
Famous quotes containing the words compatible, common, device, address and/or base:
“Despair is perfectly compatible with a good dinner, I promise you.”
—William Makepeace Thackeray (1811–1863)
“The aim of every political constitution is, or ought to be, first to obtain for rulers men who possess most wisdom to discern, and most virtue to pursue, the common good of the society; and in the next place, to take the most effectual precautions for keeping them virtuous whilst they continue to hold their public trust.”
—James Madison (1751–1836)
“UG [universal grammar] may be regarded as a characterization of the genetically determined language faculty. One may think of this faculty as a ‘language acquisition device,’ an innate component of the human mind that yields a particular language through interaction with present experience, a device that converts experience into a system of knowledge attained: knowledge of one or another language.”
—Noam Chomsky (b. 1928)
“Another success is the post-office, with its educating energy augmented by cheapness and guarded by a certain religious sentiment in mankind; so that the power of a wafer or a drop of wax or gluten to guard a letter, as it flies over sea over land and comes to its address as if a battalion of artillery brought it, I look upon as a fine meter of civilization.”
—Ralph Waldo Emerson (1803–1882)
“Music is of two kinds: one petty, poor, second-rate, never varying, its base the hundred or so phrasings which all musicians understand, a babbling which is more or less pleasant, the life that most composers live.”
—Honoré De Balzac (1799–1850)