Popular Mechanics has released an on-line article entitled, "11 Forgotten Media Formats of Yesteryear". The subtitle says, "You remember the floppy drive, but do you remember the Commodore 64 tape drive?" (My answer -- of course, I do!)
They only identify the Datasette with the C64 and not with the other compatible C= 8-bit computers - PET, VIC-20, Plus/4, C128, and CBM II series.
To read about what they say about the Datasette, see
http://www.popularmechanics.com/technology/gadgets/g3075/the-forgotten-media-of-yesteryear/?src=nl&mag=pop&list=nl_pnl_news&date=050917
Truly,
Robert Bernardo
June 10-11 Pacific Commodore Expo NW -
http://www.portcommodore.com/pacommex
July 29-30 Commodore Vegas Expo v13 -
http://www.portcommodore.com/commvex