8257 DMA Controller
8257 DMA Controller is a type of DMA Controller, that when a single Intel 8212 I/O device is paired with it, becomes 4 channel DMA Controller. In 8257 DMA Controller, the highest priority channel is acknowledged. It contains two 16-bit registers, one is DMA Address Register and the other one is Terminal Count Register.
Direct Memory Access (DMA) Controller in Computer Architecture
DMA Controller is a hardware device that allows I/O devices to directly access memory with less participation of the processor. DMA controller needs the same old circuits of an interface to communicate with the CPU and Input/Output devices.
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