Input/Output Base Address
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Base address is also called I/O port, I/O address, I/O port address and base port.
[edit] Common I/O Base Address Device Assignments in IBM PC compatible computers
| Base Address | Device |
|---|---|
| 0f - 1f | First DMA Controller 8237 A-5 |
| 20 - 3f | First Interrupt Controller 8259A, Master |
| 40 - 5f | 8254-2 |
| 60 - 6f | 8042, Keyboard |
| 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 Interrupt Controller 8259A, Slave |
| c0 - df | Second DMA Controller 8237 A-5 |
| f0 | Clear 80287 Busy |
| f1 | Reset 80287 |
| f8 - ff | 80287 Math coprocessor |
| 170-177 | Secondary ATA Hard Disk Controller |
| 1f0 - 1f7 | Primary ATA Hard Disk Controller |
| 200 - 20f | Game Controller/Joystick |
| 210 - 217 | Expansion Unit |
| 278 - 27f | LPT2 Parallel port |
| 280 - 29F | LCD on Wyse 2108 PC SMC Elite default factory setting |
| 2e8 - 2ef | COM4 |
| 2e1 | GPIB Adapter 0 |
| 2f8 - 2ff | COM2 |
| 2e2 - 2e3 | Data acquisition |
| 300 - 31f | Prototype Card |
| 300 - 31f | 3Com EtherLink default factory setting |
| 320 - 32f | XT Hard disk interface |
| 378 - 37f | LPT1 Parallel port |
| 380 - 38c | SLDC/Secondary Bi-sync interface |
| 3a0 - 3a9 | Primary Bi-sync interface |
| 3b0 - 3bb | Monochrome display |
| 3c0 - 3cf | EGA display control |
| 3d0 - 3df | Color/Graphics Display (CGA) |
| 3e8 - 3ef | COM3 |
| 3f0 - 3f7 | Floppy disk controller |
| 3f8 - 3ff | COM1 |
This list is incomplete; you can help by expanding it.
[edit] See also
- IRQ - interrupt request
[edit] External links
- Base address term definition from Webopedia
- Introduction to IRQs, DMAs and Base Addresses Copyright © 1999, Eugene Blanchard, Published in Issue 38 of Linux Gazette, March 1999
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