I thought the dots on the bottom of the carts would
 cause audio tapes
 to be kicked out of data drives.  Is that not so?  I
 _think_ you could
 use data tapes in an audio DAT recorder/player, but
 I only ever saw
 one of those, so I can't say for certain. 
I don't have any audio DAT tapes, so I can't say for
certain, but I do have an audio DAT deck - it works
just fine with the computer data tapes. Never tried it
the other way around. I think the dots are just to
differentiate between DDS1, 2 and 3. I remember once I
tried to modify a DDS2 cart to become a DDS3, to see
what would happen. It didn't work. (gee, surprise,
surprise)...
-Ian