On 10/05/2017 11:18 AM, Tom Gardner via cctalk wrote: > I suspect this might start another discussion, but as I understand it Apple > had little to do with the evolution of SASI into SCSI. > Shugart Associates published SASI in 1981 and took it to ANSI in 1982 where > they renamed it SCSI to avoid using a vendors name.
You could well be right--I do recall that there was "Mac SCSI" and then the slightly different "Everyone else's SCSI". I ran into this when talking with some SMS/OMTI engineers about an ST506-to-SCSI bridge board that I have. Their reaction was "Oh, that's Mac SCSI--you want real SCSI". What I found curious was the CDC manual that called SCSI "SASI subset". To me that says that SASI was the more elaborate protocol and SCSI initially picked and chose from it. I do know that many SASI devices work as SCSI-1 devices. Somewhere, I still have an early PC ISA SASI (not SCSI) adapter for an Ampex Megastore unit. I'm also well-acquainted with what Andy Johnson-Laird called "SCSI Voodoo" in trying to get several different SCSI devices to work off the same SCSI-2 bus. --Chuck
