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Direct Memory Access (DMA)

Direct Memory Access (DMA) and Ultra DMA

Direct Memory Access is the technology which allows components, such as disk drives, to access the computer memory directly, bypassing the central processor. This greatly speeds up the overall functioning of the computer.

In computers, speed is always of the essence. And the newer, improved standards, like Ultra DMA and DMA/33 and DMA/66 stand for data transmission rates up to 33 and 66Mb per second.


DMA and Ultra DMA

Adaptec - Analysis of SCSI versus Ultra DMA
Asus - Ultra DMA/33 Technical Note
Computer User - Inside Ultra DMA/33
Duke Univ. - DMA engine vs. CPU for Memory Bandwidth
FIC Tech Support (TW) - Ultra-DMA FAQ
Glossar (D) - What is ATA, DMA, EIDE, PIO
Master Link - DMA Tutorial
Microsoft Developer - Enabling IDE DMA on Windows Based Systems
Microsoft Support - 16-bit DMA may cause system hang
O'Reilly & Assoc. - ISA
PCMCIA - What is DMA
Brion Vibber - The Linux Ultra-DMA Mini How-to
Western Digital - Ultra DMA Implementation Guide
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