Difference between 8237 and 8257 dma controller

1.	Difference between 8237 and 8257 dma controller
Answer» The 8237 WORKS in four different modes – single, BLOCK, cascade anddemand – based on the number of ICS used and the number of bytes transferred INA CYCLE. Data transfer takes place from one memory device to another at therate of 1.6 MBps. The 8257works in two different modes – master and slave. Data transfer takes placebetween an I/O device and memory without the CPU intervention at high speeds.

Answer»

The 8237 WORKS in four different modes – single, BLOCK, cascade anddemand – based on the number of ICS used and the number of bytes transferred INA CYCLE. Data transfer takes place from one memory device to another at therate of 1.6 MBps.

The 8257works in two different modes – master and slave. Data transfer takes placebetween an I/O device and memory without the CPU intervention at high speeds.

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Difference between 8237 and 8257 dma controller

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