DMA

Updated: 10/02/2017 by Computer Hope

DMA may refer to any of the following:

direct memory access1. 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.

CHANNEL AVAILABILITY
00 Available
01 Sound device
02 Standard floppy disk controller
03 Available
04 Direct memory access controller (Not usable)
05 Available although also often used for Sound devices
06 Available
07 Available

Architecture, Bus mastering, Hardware conflict, Hardware terms, I/O port, IRQ, Memory terms, Resource, UDMA