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The pin that clears the command, request and temporary registers, and internal first/last flipflop when it is set is

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The pin that clears the command, request and temporary registers, and internal first/last flipflop when it is set is

(a) CLEAR

(b) SET

(c) HLDA

(d) RESET

I had been asked this question in examination.

Asked question is from Programmable DMA Interface 8237 -2 topic in chapter DMA, Floppy Disk and CRT Controllers of Microprocessor

1 Answer

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by (49.2k points)
Correct choice is (d) RESET

Easy explanation: A high on the reset pin clears the command, status, request and temporary registers, and also clears the internal first/last flipflop.

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