On 10/16/18, William Pechter <pechter at gmail.com> wrote:
DEC Tape II was the serial driven TU58.
The TK50 was CompacTape or something like that. It was the predecessor of a
number of square tapes...
See DLT on Wikipedia
https://en.m.wikipedia.org/wiki/Digital_Linear_Tape
My mistake. Yes, I was thinking of the TU58, a most miserable device.
-Paul W.