On 2017-10-05 4:31 PM, Chuck Guzis via cctalk wrote:
On 10/05/2017 11:39 AM, Rich Alderson via cctalk wrote:
From: Chuck Guzis
Sent: Wednesday, October 04, 2017 1:46 PM
As an aside, I picked up a 1986 Wren II full-height manual that discussed the
drive and its various interfaces. Sadly, IDE isn't one, but SCSI is referred
to as "SASI Subset"; i.e. "SCSI (SASI subset)"
I believe that you're reading that backwards. What it says is that this is a
SCSI-compatible device which employs only the SASI subset of SCSI commands, not
that "SCSI" is a subset of "SASI".
Okay, that makes sense, even if it is a bit confusing--I recall that the
SASI disk drive protocol was pretty simple.
--Chuck
I once had a Tecmar SASI adapter (I still have the documentation and
diskette) I seem to recall that it was mostly buffers which would
suggest that most of the work was done by the device driver. The disks
that went with it where ST506 drives connected to Xebec S1410 bridge
cards. This card/device driver also supported having multiple
initiators so more than one PC could share that massive 10, 15 or 33MB
disk.
The Xbec controller manual that is in the documentation suggests that
the SASI command set was much simpler that SCSI.
Paul.
