On 10/09/2017 12:52 PM, Chuck Guzis via cctalk wrote:
On 10/09/2017 06:52 AM, Jules Richardson via cctalk wrote:
My understanding there is that true SASI supports just a single target,
and so there's no selection phase like there is with SCSI (and SCSI
provides an extra signal on the connector uses during selection, which
simply isn't there with SASI). However, there seemed to be some
significant overlap and blurring of lines between SCSI and SASI, such
that some early devices calling themselves SCSI aren't quite - and it's
possible that some hardware which talks about SASI actually behaves more
like SCSI.
I'm not entirely sure about that--the PC Megastore contained both a disk
and a tape drive. So more than a single device.
Yes, looking at the Xebec S1410A manual it talks about multiple boards on
the SASI bus, so that appears to be bit rot on my part - I must be thinking
of something which predated SASI.
Having said that, I think that some bridge boards were capable of driving
both a ST506/412-type disk and QIC tape, so that particular setup wasn't
unheard of, although most bridges handled disk only.
cheers
Jules
