THE DMA CHART
The DMA (Direct Memory Access) is a data transfer method used by some I/O cards. A DMA channel is a data bus line to transfer data in and out of main memory, directly to the DMA I/O card, by passing the CPU from controlling the action. This usually speeds up the over all speed of the PC.
XT 8 BIT ISA BUS
| CHANNEL | FUNCTION |
| 0 | Dynamic Memory Refresh |
| 1 | Unassigned or SDLC |
| 2 | Floppy Disk Controller |
| 3 | Hard Disk Controller |
16 BIT ISA, EISA, MCA BUS
| CHANNEL | FUNCTION |
| DMA CONTROLLER #1 | |
| 0 | Dynamic Memory Refresh |
| 1 | Unassigned or SDLC |
| 2 | Floppy Disk Controller |
| 3 | Unassigned |
| DMA CONTROLLER #2 | |
| 4 | First DMA Controller |
| 5 | Unassigned |
| 6 | Unassigned |
| 7 | Unassigned |
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