Intel''s 8237 dma controller-microprocessor, Assembly Language

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Intel's 8237 DMA controller :

1) The 8237 contain 4 independent I/O channels

2) It contains 27 registers, 7 of which are system-wide registers and 5 for each channel.

3) Out of 5 register: 4 are 16-bit and 1 is 6-bit. they are

DMA base address
DMA current address
DMA total
DMA remaining
6-bit is the mode register

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