Yamaha CS80

What the... ???  I just saw this video:
http://www.youtube.com/user/musictrackjp#p/u/1/RV7pdqgLqdM

It's in Japanese and shows off the smaller, monophonic (ok - one was duophonic) CS synths from the late '70s.  I remember the CS-5, CS-10, CS-20M, and CS-40M from local music stores.  And I've seem videos of the CS-30- which was apparently not sold in the US.  

This video shows off something labelled the CS-15D.  I've never heard of it before.  It looks like the CS-20/40D but has a bunch of fixed preset buttons replacing most of the knobs.  When did they make this? Where did they sell it?  It looks like Yamaha's answer to the Arp Pro-Soloist or a return to the SY-1/2.  Anyone ever use one?

Thanks for any info!
 
David