I thought the TS05 was a 1600bpi drive, so I would
have guessed the
F880. But there seem to be a few sites saying it was an 80MB drive,
so... M891 then?
I don't know how similar the F880 and M891 are inside, but I have a TS05
for my 11/730 and I used the F880 service manual when I needed to repair it.
Of course it might be that the bit I needed to fix (part of the tape tension
control circuit) is the same in the M891 and F880...
-tony