Here is a good source of info and a good review back at the peak of the era:
http://www.thevintageknob.org/MISCELLANEOUS/SS1980TT/SS1980TT.html
Excellent history along with photos and ads.
http://www.thevintageknob.org/MISCELLANEOUS/SS1980TT/SS1980TT.html
Excellent history along with photos and ads.