In 1991, the 93.3 FM call letters were changed from KDWZ to KIOA-FM. The KDWZ Top-40 format was dropped in favor of simulcasting KIOA with it's oldies format.
The jingles used under the voicers used the legendary "KIOA Nine Forty" logo with the "Nine Forty" part not sung.
KIOA/KIOA-FM voicers. Right after switch from KDWZ
Courtesy of Frank Bittner
KIOA main page
Des Moines Radio Stations page
DesMoinesBroadcasting.com home page