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What Does DMA Do For The Computer

By tech8000@teleplan-ventura ·
I Know that you should have the DMA Enabled if you want to View DVD's & Disabled if you want to Write To CD-R/W or DVD-Ram.
What does it do for the computer to make it act the way it does. (Just Curious)
David L
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What Does DMA Do For The Computer

by mm212 In reply to What Does DMA Do For The ...

DMA stands for Direct Memory Access (or Addressing). It allows data to be moved to or from your hard drive (or CD-R/W or whatever) bypassing your processor completely. This greatly enhances the performance of your system.

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What Does DMA Do For The Computer

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What Does DMA Do For The Computer

by Curacao_Dejavu In reply to What Does DMA Do For The ...

Direct Memory Access

Direct Memory Access (DMA) is a capability provided by some computer bus architectures that allows data to be sent directly from an attached device (such as a disk drive) to the memory on the computer's motherboard. The microprocessor is freed from involvement with the data transfer, thus speeding up overall computer operation.
Usually a specified portion of memory is designated as an area to be used for direct memory access. In the ISA bus standard, up to 16 megabytes of memory can be addressed for DMA. The EISA and Micro Channel Architecture standards allow access to the full range of memory addresses (assuming they're addressable with 32 bits). Peripheral Component Interconnect accomplishes DMA by using a busmaster (with the microprocessor "delegating" I/O control to the PCI controller).

An alternative to DMA is the Programmed Input/Output (PIO) interface in which all data transmitted between devices goes through the processor. A newer protocol for the ATA/IDE interface is Ultra DMA, which provides a burst data transfer rate up to 33 MB (megabytes) per second. Hard drives that come with Ultra DMA/33 also support PIO modes 1, 3, and 4, and multiword DMA mode 2 (at 16.6 megabytes per second).

www.whatis.com for all your future questions

Leopold

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What Does DMA Do For The Computer

This is exactly what I was looking for Thanks for everything and keep up the help you are Good at what You Do.
David.L

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What Does DMA Do For The Computer

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