re ide vs scsi in article apr grebyn com richk grebyn com richard krehbiel writes heck if ide used dma then you d hear all kinds of complaints about isa bus systems with more than m ram not working with their ide drives m is the dma addressing limit of the isa bus and if ide did dma there would be trouble there would be no problems as long as the os didn t set up a dma transfer to an area above the mb area the dma controller probably can t be programmed that way anyways so there probably isin t a problem with this besides like i said before the fdd controller uses dma channel and i don t yet believe that the hdd controllers any of them mfm rll etc don t also use dma
