The other thing that you can try is to create a 4MB ram disk. Ram disks start at the "back" of the ramcard and work forwards, so a 4MB ramdisk would take up the last 4MB on the card. Thus, unless you were writing to the ramdisk itself (or ran a program from the ramdisk), the Apple Highspeed SCSI would never need to DMA into "non DMA-able" memory space. - Paul