Article ID: 104418
Article Last Modified on 5/6/2003
APPLIES TO
- Microsoft MS-DOS 2.11 Standard Edition
- Microsoft MS-DOS 3.1
- Microsoft MS-DOS 3.2 Standard Edition
- Microsoft MS-DOS 3.21 Standard Edition
- Microsoft MS-DOS 3.3 Standard Edition
- Microsoft MS-DOS 3.3a
- Microsoft MS-DOS 4.0 Standard Edition
- Microsoft MS-DOS 4.01 Standard Edition
- Microsoft MS-DOS 5.0 Standard Edition
- Microsoft MS-DOS 5.0a
- Microsoft MS-DOS 6.0 Standard Edition
- Microsoft MS-DOS 6.2 Standard Edition
- Microsoft MS-DOS 6.21 Standard Edition
- Microsoft MS-DOS 6.22 Standard Edition
This article was previously published under Q104418
SUMMARY
A direct memory access (DMA) channel provides high speed data transfer between a peripheral device, such as a disk drive controller, and memory without intervention by the CPU. Listed below are the DMA channels for the IBM PC and XT class machines and the IBM AT and above class machines.
IBM PC and XT
-------------
DMA Channel Description
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0 Dynamic RAM Refresh
1 Reserved
2 Floppy Disk Controller
3 Hard Disk Controller
IBM AT and Above
----------------
DMA Channel Description
---------------------------------------------------
0 Reserved
1 SDLC Controller
2 Floppy Disk Controller
3 Hard Disk Controller
4 Cascade from DMA channels 0 - 3
5 Reserved
6 Reserved
7 Reserved
REFERENCES
"The Handbook For Microcomputer Technicians," by Peter N. Bernstock, ISBN 0-89435-424-8
The products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.
Additional query words: 6.22 2.00 3.0 3.00 3.1 3.10 3.2 3.20 3.21 3.22 3.3 3.3a 3.30 3.30a 4.0 4.0a 4.00 4.00a 4.01 4.01a 5.0 5.00 5.0a 5.00a 6.00 6.20
Keywords: KB104418
