Question

The register that holds the data during memory to memory data transfer is

(a) mode register

(b) temporary register

(c) command register

(d) mask register

This question was posed to me in an internship interview.

I need to ask this question from Programmable DMA Interface 8237 -2 topic in division DMA, Floppy Disk and CRT Controllers of Microprocessor

Answer 1

Right answer is (b) temporary register

The best I can explain: The temporary register holds the data during memory to memory data transfers. After the completion of the transfer operation, the last word transferred remains in the temporary register, until it is cleared by a reset operation.