The VS2k had a HDC9224 ST506 controller, programmed as ST506 controllers were at that time :-) It also had a NCR5380 for SCSI, and same here - just a normal SCSI controller, programmed directly.P.S. Here's something I can't remember, quite. The KA410 also has an onboard controller for an ST506 hard drive. Does _that_ emulate MSCP?My recollection says that the whole disk format was done in software, to be compatible with the RQDX3. And looking in NetBSD, it looks like it has a simpler interface than MSCP for the disks on that controller. (But I could be looking at the wrong thing...)
Both of these had their own DMA area which were not in main memory, so data had to be copied to its destination.
-- R