These are the late night Monday-Friday schedules on all three networks for each calendar season beginning September 1989. All times are Eastern/Pacific.
Talk/variety shows are highlighted in yellow, network news programs in gold, and local news & programs are highlighted in white background.
Fall 1989
The Pat Sajak Show was reduced to 60 minutes on October 30, 1989.
References
1989–90 United States network television schedule (late night) Wikipedia(Text) CC BY-SA