DMA是“直访存贮器”的英文(DirectMemory Adress)编写.其含义是微型计算机某外设(如磁盘)与存贮器之间直接进行信息交换的方式.在通常情况下,外设同内存交换信息都要藉助CPU干予来实现,如数据从外设接口送入累加器,再从累加器送到某内存单元,或者从内存某单元送入累加器,再从累加器送到外设 DMA is “direct memory” English (DirectMemory Adress) prepared by the meaning of the microcomputer computer peripherals (such as disk) and memory direct exchange of information between the ways in which the same peripherals Memory exchange information must be done with the CPU to do, such as data from the peripheral interface into the accumulator, and then sent from the accumulator to a memory unit, or from a memory unit into the accumulator, and then sent from the accumulator Assume