DMA may refer to any of the following:
1. Short for direct memory access, DMA is a feature of some computer bus architectures that allows data to be sent from a storage device to memory without using the CPU. Because DMA frees the processor from involvement in the transfer process, it tends to be faster than PIO mode.
2. When referring to an ISA bus, DMA is channels that are used by communications devices such as SCSI, sound cards, and tape backup adapters. Below is a listing of the different channels and their availability.
|02||Standard floppy disk controller.|
|04||Direct memory access controller (not usable).|
|05||Available, although also often used for sound devices.|