jim s wrote:
  It is a SCSI.  Sun used the 50 pin Dsub, and I suspect
the dsub 25 is
 for Apple. 
I've certainly seen tape drives in cases like that. I've also seen a PC SCSI
card with a 25-pin Apple-a-like connector on it. As you say, Sun used that
style of 50-pin connector... so I suspect it was just a tape backup unit at
one point in time.
cheers
Jules