Is there some trick / adm symbol / configure option to tell the kernel (Xenix 2.3.2 386) that I would perfer it not use the DMA, but use programed I/O? I seem to remember something about this, but can't jog my memory enough to find it. If it is adb, no need to explain how to use, just need symbol name & values. John Watson ...!rutgers!carssdf!usenet