[comp.sys.mac.hardware] Need a Mac to weird SCSI exabyte cable

wilson@csli.Stanford.EDU (Nathan Wilson) (09/26/90)

The company I work for recently purchased a SCSI exabyte tape drive
for our soon to arrive SparcStation.  A few days ago I heard of
someone using an old Dec exabyte to backup their mac.  I've done a bit
of calling around and it appears that Retrospect from SuperMac (Dantz)
will probably do the trick.  Does anyone out there have any experience
to confirm or deny this?

In any case, I happy to make the test myself.  My real problem is that
I looked on the back of the exabyte and discovered that it doesn't
have a CHAMP50 connector as I expected, but a DB50.  I did some more
calling around including to the manufacturer and nobody has a SCSI
DB50 to DB25 cable.  I have the pin outs for a disk drive with the
same DB50 connector and the pin outs for the Mac, but I don't know
what goes to what.  All the same symbols appear, but I don't know if
they just match up or whether some of them get swapped.  Also there
are two pin outs for the disk: a Single Ended Type (which has a bunch
of extra grounds) and a Differential Type (which has a + and - form of
each pin).  What is the significance of the two forms?  Is there an
easy way to figure out what type the box is, and if it is the wrong
type is it easy to fix?

Nathan Wilson
Teleos Research
nathan%teleos.com@ai.sri.com