Bill,
I must admit that I didn't knew about the Korg SAS-20 either even though I have been playing arranger keyboards since 1983 (and you are right: they weren't called arranger keyboards then). Another link:
Korg SAS-20 Interesting to see how technology has progressed in 25 years.
Kind regards,
Tommy
[This message has been edited by TommyF (edited 04-18-2007).]