Since we're nitpicking, no it isn't. DMA is a particular method of accessing memory. You can have direct mapped access, cache mediated, PIO, DMA, etc. There can

Since we're nitpicking, no it isn't. DMA is a particular method of accessing memory. You can have direct mapped access, cache mediated, PIO, DMA, etc. There can be many different memories, such as expansion cards, where you could DMA to/from, apart from main memory.