From my memories from the 80\'s in NYC market:
Syn Sale started off in February 1985 on channel 9 (WWOR), I believe at 8:30.
Moved to channel 7 (WABC) in the fall at 4:30, then switched with Jeopardy and aired at 4 (I guess so Jeopardy could provide better ratings into news at 5).... Jeopardy moved back to 4:00 in Sept of 1986 followed by syn Card Sharks.... few months later Oprah moved here.... Jeopardy moved to 7PM with reruns at 10AM followed by Split Second)...
As for ET.... started on WWOR for a year or 2, then I remember it briefly on WPIX, then at WABC for 2 or 3 yrs until 1986... then WWOR and back to WABC in 1988.... in 1990 it moved to WCBS where it still is today...
I suddenly feel like Zach Horan...