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If the 8237 DMA controller is decoded at I/0 ports 2000H-200FH. what ports are used to program channel 1? Please explain your suggested answer- I

If the 8237 DMA controller is decoded at I/0 ports 2000H-200FH. what ports are used to program channel 1? Please explain your suggested answer- I can't seem to find the answer in the book and I would like to understand how I would figure out the answer if the numbers were changed. The answer alone is NOT helpful- I need to understand HOW you reached that answer so I can answer similar problems on my own.

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