Question

The register that can be automatically incremented or decremented, after each DMA transfer is

(a) mask register

(b) mode register

(c) command register

(d) current address register

This question was addressed to me in exam.

I want to ask this question from Programmable DMA Interface 8237 -1 in chapter DMA, Floppy Disk and CRT Controllers of Microprocessor

Answer 1

Right answer is (d) current address register

For explanation: The address is automatically incremented or decremented after each DMA transfer, and the resulting address value is again stored in the current address register.