ISA DMA: Difference between revisions

Ignore that GHz tag on your processor or the fact that even PCI runs at 33 MHz. DMA controllers are fixed at this rate. This includes EISA and PS/2 32-bit DMA controllers. Some fof the differences between these and the stock ISA DMA controllers is a extra page register allowing for 64k transfers anywhere in 4 GiB of space and the ability to do 32-bit transfers, and these DMA controllers exists only on EISA and MCA systems, which are now obsolete and are not described here.