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The pin that disables all the DMA channels by clearing the mode registers is

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in Microprocessor by (39.4k points)
The pin that disables all the DMA channels by clearing the mode registers is

(a) MARK

(b) CLEAR

(c) RESET

(d) READY

The question was posed to me during an interview.

I'm obligated to ask this question of DMA Controller 8257 in chapter DMA, Floppy Disk and CRT Controllers of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (c) RESET

Explanation: The RESET pin which is asynchronous input disables all the DMA channels by clearing the mode registers, and tristate all the control lines.

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