Seems like the recent problems with my DAT changer are SCSI related;
it's taken out
heffalump three times in the last two days.
There goes my hope of making a SCSI chain work which consists of a wide controller, two SCA drives internally, a Sun 68-to-50 cable followed by the narrow changer+tape unit and a narrow terminator at the end of the mess. (I don't have any wide cables, sockets etc. to fix up the narrow tape changer...)
Of course this is -as SCSI goes- not a big surprise; everybody knows that termination issues can only be resolved with judicious application of candles, knives and goats. The fact that my setup has worked fine for a few weeks only reaffirms the Magic SCSI Properties.