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【Wikipedia】Input/Output Base Address  

2008-12-16 02:24:27|  分类: L-Boot |  标签: |举报 |字号 订阅

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In x86 architecture, an input/output base address is a base address used for an I/O port.

Common I/O Base Address Device Assignments in IBM PC compatible computers

Base Address 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
0f0 - 0f5 PCjr Disk Controller
0f8 - 0ff 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 LPT2 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
2f8 - 2ff COM2 serial port
2e2 - 2e3 Data acquisition
300 - 31f Prototype Card
300 - 31f Novell NE1000 compatible Ethernet network interfaces
320 - 323 ST-506 and compatible hard disk drive interface
330 - 331 MPU-401 UART on most sound cards
340 - 35f Primary SCSI host adapter
370 - 377 Secondary floppy disk drive controller
378 - 37f LPT1 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 LPT 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
This list is incomplete; you can help by expanding it.

Note: For many devices listed above the assignments are only defaults which can be changed via jumpers, DIP switches, or software.

See also

  • IRQ - interrupt request

References

HelpPC Quick Reference Utility by David Jurgens

External links


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