Direct-Memory Access channel (DMA) facilitates data to move in and out of the system

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ESE Electrical 2014 Paper 2: Official Paper

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Direct Memory Access:

Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory (random-access memory), independent of the central processing unit (CPU).
DMA avoids using the CPU thus allowing the CPU to attend another job
It increases the speed of the data transfer between the memory and the I/O devices
DMA is used when a large amount of data is to be printed out from the memory of a computer
The problem of slow data transfer between input-output port and memory or between two memory is avoided by implementing the Direct Memory Access (DMA) technique
It facilitates data to move in and out of the system without programme intervention.
It is implemented by using 8257 DMA controller