I wrote: > NCR53c9x chips (except AM53c974) do not have DMA engine in it, > so MCA SCSI would have some other stuff for DMA. > You might have to search another doc. I found Linux driver (linux/drivers/scsi/mca_53c9x.c) seems to have some description about NCR 86C01 (which is "an MCA interface chip"). --- Izumi Tsutsui tsutsui@ceres.dti.ne.jp