Hi,
Besides the Demon, also new for 1980 at both parks was a traditional Eli Bridge Company Ferris wheel. The Ferris wheel was located in County Fair. The Santa Clara Ferris wheel is seen in this commercial. In Gurnee, the Ferris wheel was located nearer to the Eagle's Flight skyride station.
The commercial is now available for viewing here:
http://www.greatamericaparks.com/images ... ?pos=-1669
Steven