Here’s an FX “coming up” promotional spot for M*A*S*H. I believe this particular spot is from 1999 but I’m not 100% sure. I found it on a tape of episodes recorded from FX between November 1999 and September 2001 so it’s definitely from that time period.
I really don’t remember FX promotional spots ever looking like this. That’s probably because I didn’t pay much attention to what was coming up. I knew when M*A*S*H was on and that’s all I watched on FX.